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Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 19 — Sep. 18, 2006
  • pp: 8728–8736
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Broadly tunable picosecond narrowband pulses in a periodically-poled KTiOPO4 parametric amplifier

M. Tiihonen, V. Pasiskevicius, and F. Laurell  »View Author Affiliations


Optics Express, Vol. 14, Issue 19, pp. 8728-8736 (2006)
http://dx.doi.org/10.1364/OE.14.008728


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Abstract

A picosecond double-pass periodically poled KTiOPO4 (PPKTP) noncollinear parametric amplifier that delivers tunable and narrowband outputs between 1.1 µm and 1.65 µm is reported. The seed source is an ultra-broadband emitting PPKTP collinear parametric generator, which is spectrally narrowed, from a bandwidth of 80 THz to about 0.3 THz, by a Fourier-filtering arrangement. A parametric gain of 70 dB is measured with preserved spectral bandwidth, resulting in a signal energy of 6.5 µJ at a pump energy of 60 µJ from the Ti:sapphire regenerative amplifier. The total energy-budget for the setup is less than 100 µJ with an optical-to-optical efficiency of 12 %. This particular system is scalable to even lower pump energies by tighter focusing arrangements.

© 2006 Optical Society of America

1. Introduction

Tunable picosecond (ps) pulses in the near- to mid-infrared spectral region, between 1µm and 4 µm, are required in many spectroscopic applications within medical, biological, and material science. Radiation in this “fingerprint” spectral region gives access to the vibrational lines and their overtones using Raman scattering spectroscopy [1

1. C. J. Hirschmugl, “Frontiers in infrared spectroscopy at surfaces and interfaces,” Surf. Sci. 500, 577–604 (2002). [CrossRef]

, 2

2. A. Zambusch, G. R. Holton, and X. S. Xie, “Three-dimensional vibrational imaging by coherent anti-Stokes Raman scattering,” Phys. Rev. Lett. 82, 4142–4145 (1999). [CrossRef]

]. In particular, imaging techniques such as coherent anti-Stokes Raman scattering (CARS) benefits from employing relatively narrowband picosecond sources, since it reduces the background signal originating from two-photon electron resonances [3

3. J. X. Cheng, A. Volkmer, L. D. Book, and X. S. Xie, “An epi-detected coherent anti-Stokes Raman scattering (E-CARS) microscope with high spectral resolution and high sensitivity,” J. Phys. Chem. B 105, 1277–1280 (2001). [CrossRef]

]. An additional benefit of the longer wavelengths, in terms of imaging, is the decrease of the Rayleigh-scattering efficiency. At the same time, by using infrared radiation damaging of the biological substance is avoided, and CARS-imaging has even been demonstrated on living cells using near-infrared picosecond pulse trains [2

2. A. Zambusch, G. R. Holton, and X. S. Xie, “Three-dimensional vibrational imaging by coherent anti-Stokes Raman scattering,” Phys. Rev. Lett. 82, 4142–4145 (1999). [CrossRef]

]. It has also been shown that for excitation wavelengths longer than the scattering object the backwards propagating CARS signal is strongly enhanced and can provide higher measurement sensitivity [4

4. A. Volkmer, J.-X., and X. S. Xie, “Vibrational imaging with high sensitivity via epidetected coherent anti-Stokes Raman scattering,” Phys. Rev. Lett. 87, 023901 (2001). [CrossRef]

].

The laser source for CARS, and other spectroscopic or imaging applications, should produce relatively narrowband pulses independently tunable at two wavelengths. The repetition rate should be as high as possible in order to increase data collection rate, however, in many cases it is limited to below 500 kHz in order to reduce the thermal load on the specimen. This is especially important for in-vivo imaging [2

2. A. Zambusch, G. R. Holton, and X. S. Xie, “Three-dimensional vibrational imaging by coherent anti-Stokes Raman scattering,” Phys. Rev. Lett. 82, 4142–4145 (1999). [CrossRef]

, 3

3. J. X. Cheng, A. Volkmer, L. D. Book, and X. S. Xie, “An epi-detected coherent anti-Stokes Raman scattering (E-CARS) microscope with high spectral resolution and high sensitivity,” J. Phys. Chem. B 105, 1277–1280 (2001). [CrossRef]

, 5

5. E. O. Potma, D. J. Jones, J.-X. Cheng, X. S. Xie, and J. Ye, “High-sensitivity coherent anti-Stokes Raman scattering microscopy with two tightly synchronized picosecond lasers,” Opt. Lett. 27, 1168–1170 (2002). [CrossRef]

]. One approach to build such a system uses two repetition rate-locked tunable picosecond Ti:Sapphire lasers with electro-optic pulse-pickers, that provides synchronized pulse trains at 250 kHz rate [3

3. J. X. Cheng, A. Volkmer, L. D. Book, and X. S. Xie, “An epi-detected coherent anti-Stokes Raman scattering (E-CARS) microscope with high spectral resolution and high sensitivity,” J. Phys. Chem. B 105, 1277–1280 (2001). [CrossRef]

, 5

5. E. O. Potma, D. J. Jones, J.-X. Cheng, X. S. Xie, and J. Ye, “High-sensitivity coherent anti-Stokes Raman scattering microscopy with two tightly synchronized picosecond lasers,” Opt. Lett. 27, 1168–1170 (2002). [CrossRef]

]. However, reduction of the relative timing jitter to acceptable levels required rather elaborate locking electronics. It has also to be considered that operation of Kerr-lens mode-locked Ti:Sappire in the picosecond pulse regime, at wavelengths longer than 900 nm, is not as reliable as in femtosecond regime, even for commercial lasers. Another, and possibly simpler, solution is deriving tunable pulses from optical parametric devices pumped by a picosecond laser. Recently a synchronously pumped optical parametric oscillator employing periodically poled KTiOPO4 (PP-KTP) and pumped by a mode-locked and frequency-doubled Nd:YVO4 has been demonstrated [6

6. F. Ganikhanov, S. Carrasco, X. S. Xie, M. Katz, W. Seitz, and D. Kopf, “Broadly tunable dual-wavelength light source for coherent anti-Stokes Raman scattering microscopy,” Opt. Lett. 31, 1292–1294 (2006). [CrossRef] [PubMed]

]. This system provides perfectly synchronized pulses with tunable spectral separation. However, obtaining narrow pulse spectrum and tuning at the same time is not straightforward in this particular setup. The spectral and the temporal properties of synchronously pumped optical parametric oscillators are quite sensitive to the exact detuning between the pump and the parametric oscillator cavities.

In this work we utilize the broadband parametric gain property of PPKTP to build an OPG-seeded picosecond PPKTP OPA, where the collinear interaction in the OPG provides virtually white light in the near- to mid-infrared region, spanning between 1.08 µm and about 3.8 µm in a single direction. A properly filtered seed spectrum is amplified using broadband noncollinear parametric interaction in PPKTP with properly chosen QPM period. The amplifier crystal provides signal-gain from 1.1 µm to degeneracy without changing the propagation direction of the signal. This allows for simple tuning, double-pass amplification in a single PPKTP crystal, and easy separation of the OPA signal from the remaining pump.

2. Experimental setups and results

The experimental set-up is depicted in Fig. 1. The OPG and OPA setup consists of two uncoated PPKTP crystals with QPM grating periods of 28 µm and 26.3 µm, respectively. The PPKTP crystals had dimension of 8 mm, 5mm and 1 mm along x, y, and z crystal axes, respectively. The QPM periods have been chosen different in order to realize collinear parametric interaction in the OPG crystal and noncollinear interaction in the OPA crystal [17

17. A. Fragemann, V. Pasiskevicius, and F. Laurell, “Broadband nondegenerate optical parametric amplification in mid infrared with periodically poled KTiOPO4,” Opt. Lett. 30, 2296–2298 (2005). [CrossRef] [PubMed]

, 18

18. M. Tiihonen, V. Pasiskevicius, A. Fragemann, C. Canalias, and F. Laurell, “Ultrabroad gain in optical parametric generator with periodically poled KTiOPO4 and RbTiOPO4,” in press Appl. Phys B (2006).

]. Both crystals were pumped by an Ti:sapphire regenerative amplifier tuned to a wavelength of 823 nm, which is generating 1 picosecond-long pulses at a repetition rate of 1 kHz. The FWHM of the pump spectrum was 1 nm. The pump beam was split in a 12:88 ratio, where the 12 % was directed to the OPG stage, while the remaining pump was propagating through a delay-line and synchronized with the seed in the OPA stage. The beam radius incident on the 12:88-beam splitter was ~3 cm (e-2 intensity). The pump beams were collimated in the PPKTP crystals by the telescopes: f1–f2 and f1–f3 (f1=500 mm, f2=50 mm, and f3=100 mm), forming the beam radii of 300 µm in the OPG crystal and 600 µm (e-2 intensity) in the OPA crystal. We intentionally employed rather large pump beam sizes, in order to take advantage of the large average power available from the amplifier, which substantially simplifies the power measurements. In principle, the beam radii can be reduced by about an order of magnitude if higher repetition rate pump systems with lower pulse-energy budget are used. The collinear OPG, in PPKTP with QPM period of 28 µm, provided an ultrabroad bandwidth seed, which extended from 1080 nm to 3800 nm. However, here we only used the signal part of the spectrum, i.e., 1080 nm to 1650 nm. The OPG beam was collimated with the lens, f3, which was followed by a 3.2 mm circular aperture for spatial mode filtering. The OPG produces a broad-band beam without measurable angular dispersion, i.e. the spectral width is not affected by the spatial limitation of the beam. The undepleted OPG pump was blocked by a long pass filter (LPF).

Fig. 1. The experimental setup consists of an OPG-stage (top) and an OPA-stage (right bottom). The seed is spectrally manipulated in the “black-box” and thereafter launched into the OPA. The pump for the OPA-stage is delayed and the power output is adjusted with the λ/2-wave plate (WP) and the Glan polarizer (GP).

In between the OPG and OPA crystals a spectral filtering and conditioning can be performed (depicted as spectral management in Fig. 1). For our purposes of tunable picosecond pulse generation, we used a zero-dispersion compressor setup with a slit-aperture in the Fourier plane. The bandwidth filter is discussed below in more detail. The spectrally conditioned seed (depicted as kseed, out in Fig. 1) was focused by the lens f4=250 mm into a 600 µm beam radius inside the OPA crystal. A noncollinear OPA configuration was chosen, since it facilitates seeding arrangements and enables easy double-pass amplification, if needed.

In order to support amplification of the whole seed spectrum, the external angle between the x-axis of the PPKTP OPA crystal and the pump was set to 22 degrees, whereas the external angle between the pump and the seed was 3.6 degrees (62.8 mrad). It should be noted that there was a slight angular dispersion apparent in a separately measured parametric fluorescence spectrum; however the angular dispersion was very small and, in the seeded amplifier operation, the seed’s angle did not require additional adjustments over the entire tuning range.

For the pump pulse energy of 27 µJ (peak intensity of 9.5 GWcm-2) incident on the OPG, the measured seed energy, after the long pass-filter and the spatial filter (kseed, in in Fig. 1), was measured to 1.62 µJ. Without the spatial filter an overall conversion efficiency of 30 % was measured. However, it should be noted that the total efficiency was slightly higher as we employed a filter in front of the power meter in order to block the idler above 2000 nm, so that only relevant signal seed power could be monitored.

Fig. 2. (a). Measured amplified central wavelength as a function of the time delay of the OPA pump beam. (b). The output spectra. The grey curve is the OPG output spectrum. Dashed curve: at a delay of 1 ps. Dotted curve: at a delay of 4 ps. Dotted-Dashed: at a delay of 7.3 ps.

In order to increase the spectral control and to reduce the seed spectral bandwidth, we removed the glass slabs and employed a zero-dispersion compressor arrangement, which was inserted after the OPG. In Fig. 3, the modified spectral management set-up is shown. The zero-dispersion setup, also called the Fourier spectral filtering setup, consists of: a λ/2-wave plate (WP), a grating with 900 grooves/mm, a lens with the focal length f5=80 mm and a 30 mm aperture diameter, a 300 µm wide slit-aperture in the Fourier plane (AP), and an aluminium mirror (MFP). The wave-plate rotates the polarisation by 90 degrees in order to access the highest diffraction efficiency, which was approximately 80 %. The distance between the grating and the mirror MFP is 2×f5. Consequently, the m=-1 diffraction order of the grating is Fourier transformed by f5. This means that, in the Fourier plane (i.e. at the mirror MFP) the seed’s spectrum is spatially distributed over the mirror MFP and it is readily accessible for spectral filtering. Narrow-bandwidth tuning is achieved by translating the 300 µm wide slit-aperture along the mirror MFP. Since the spectral bandwidth of the seed is very broad, the angular spread of the diffracted beam also becomes large and, as a consequence, the f5-lens’ aperture was too small to collect all the frequencies at the same time. However, by rotating the grating once, in the middle of the tuning range, the whole spectrum from 1080 nm to 1650 nm could be accessed. The two grating positions correspond to the angles of incidence of 58 degrees and 69 degrees with respect to the normal of the grating. The resulting diffraction angles for the m=-1 diffraction order are 16 degrees and 24.6 degrees, which corresponds to central wavelengths of 1260 nm and 1500 nm, respectively. It is important to stress that in this spectral filtering arrangement the beam returning from the filter is not changing its pointing angle during the tuning procedure; thus, the seed’s routing mirrors do not need to be realigned. In this manner, a seed with narrow bandwidth of less than 10 cm-1 (300 GHz) could be continuously tuned from 1080 nm to 1650 nm. In Fig. 4(a) the seed spectra are depicted as they are tuned over the parametric gain spectrum of the 26.3 µm PPKTP crystal deployed in the OPA [the grey curve in Fig. 4(a)].

Fig. 3. Modified experimental setup. The OPG seed is spectrally manipulated in a zero-dispersion arrangement. The seed’s polarization is rotated with the λ/2-wave plate (WP) in order to maximize the diffraction efficiency into the minus first-order of the grating.

For the OPG pump energy of 27 µJ, the Fourier-filtered seed energy (kseed, out) was approximated to 0.57 pJ. The seed energy was measured with a 1 GHz InGaAs-photodetector, which was carefully calibrated using amplified signal and a power meter. Example of the OPA signal spectrum with a central wavelength of 1495 nm after a single-pass through the amplifier is shown in Fig. 4(b). The spectrum was recorded at the OPA pump pulse energy of 50 µJ (4.4 GWcm-2). At this pump intensity the amplified signal (idler) energy was 2.7 µJ (2.2 µJ). The same energies were found throughout the tuning range. This corresponds to a single-pass parametric gain of 67 dB and an overall efficiency of 10 %. As evident from Fig. 4(b), the spectral bandwidth of 2.2 nm (FWHM) was preserved after amplification. The spectrum has the typical Fraunhofer diffraction pattern of the slit in the Fourier-filter arrangement. When the pump energy was increased to 83 µJ (7.3 GWcm-2), the single-pass signal gain increased to 69 dB producing amplified signal energy of 4.8 µJ. However, the spectrum had broadened more than five times due to the increasing of amplified parametric fluorescence (APF).

Fig. 4. (a). Grey curve is the OPA crystals gain spectrum. Black curves: tuning of the seed by moving the aperture in the FP. (b) Single-pass amplified spectrum. A central wavelength of 1497 nm, with a preserved bandwidth of 2.2 nm (FWHM). The spectrum is diffraction-limited, due to the slit-aperture in the Fourier plane.

In order to circumvent the onset of APF, to preserve the narrow bandwidth, and to increase the power level, a double-pass configuration was constructed by re-using the undepleted OPA-pump. Figure 5 illustrates this arrangement. The undepleted pump and the signal are imaged off-axis with a lens, f3=100 mm, in order to displace the constituent beams when sending them back for a second pass amplification in the PPKTP crystal. The distance between the PPKTP and the mirrors, M1 and M2, are 2×f3, where M1 is mounted on a translation stage for temporal synchronization between the pump and the signal. The signal and the pump on their return path are displaced by the same distance so the interaction angle in the PPKTP crystal stays approximately the same as in the first pass. Moreover, because of the signal displacement after the second pass through the amplifier, a pick-out mirror can be inserted for the signal output. It should be noted that the idler, which is generated in a conjugate direction on the opposite side from the pump wave vector, is not used in the second pass through the amplifier.

Fig. 5. The second-pass experimental setup. The signal and the pump propagate off-axis through the lens fs and the mirrors M1 and M2 displaces the beams when returning for a second-pass through the PPKTP crystal.

The second-pass amplification increased the overall OPA efficiency to 20 %, generating signal (idler) pulse energy of 6.5 µJ (5.3 µJ) for the pump energy of 60 µJ (5.3 GWcm-2) as shown in Fig. 6(a). At this pump intensity the parametric gain increased to about 70.5 dB. The stability of the output signal was ±3%, which is close to that of the pump. The maximum pump intensity was determined by monitoring the amplified signal spectrum. The two solid curves in Fig. 6(b) are the signal spectra at two different wavelengths of the seeded double-pass OPA measured at 60 µJ of pump energy, whereas the dotted line corresponds to the unseeded one. It is clearly seen that almost all the APF are completely suppressed when the OPA is seeded, and by tuning away from degeneracy it decreases even more. At pump intensity of 5.3 GWcm-2 the APF constitutes only -30 dB in the OPA when tuned close to degeneracy. Increasing the pump energy further would increase the APF background, which might not be acceptable for most applications.

Fig. 6. (a). overall OPA efficiency and signal energy as a function of incident pump energy. (b): Spectra at 60 µJ of pump energy. Dotted curve: - unseeded double-pass OPA. Solid lines - seeded double-pass OPA.

3. Conclusion

In conclusion, a narrow bandwidth picosecond noncolinear PPKTP OPA that is continuously tunable between 1100 nm and 1650 nm have been demonstrated. The seed source is an ultrabroad bandwidth-generating collinear PPKTP OPG. The broadband seed was spectrally filtered by using a Fourier spectral filtering arrangement, which allows simple tuning of the seed wavelength. The generated signal bandwidth is slightly smaller than 300 GHz, which is maintained throughout the tuning range. The bandwidth is determined by the width of the slit in the Fourier plane. In principle, the spectral width can be reduced even further in this setup, however, at the cost of increasing slit-diffraction ripples appearing in the spectrum, and decreasing available seed energy. The latter can be boosted to a certain degree by increasing the pump power in the OPG stage. In order to increase the conversion efficiency of the OPG-OPA system, we re-used the undepleted pump in a second-pass through the OPA PPKTP crystal. In doing this, a parametric gain exceeding 70 dB was obtained. For a total pump energy of 100 µJ (both the OPG and the OPA) a signal (idler) output energy of 6.5 µJ (5.3 µJ) was achieved, corresponding to a total optical-to-optical efficiency of 12 %. It should be noted that with this PPKTP OPG-OPA arrangement the same amplification factors should be achieved in higher-repetition rate picosecond systems. For instance, a typical Ti:Sapphire regenerative amplifier operating at 150 kHz repetition rate provides pulse energies of about 8 µJ. In order to achieve the same amplification ratio the pump beam radius in the OPG and OPA PPKTP crystals have to be reduced by approximately a factor of 3.5 down to 86 µm and 171 µm, respectively.

Acknowledgments

This work has been supported in part by Carl Tryggers foundation and Knut and Alice Wallenberg foundation.

References and links

1.

C. J. Hirschmugl, “Frontiers in infrared spectroscopy at surfaces and interfaces,” Surf. Sci. 500, 577–604 (2002). [CrossRef]

2.

A. Zambusch, G. R. Holton, and X. S. Xie, “Three-dimensional vibrational imaging by coherent anti-Stokes Raman scattering,” Phys. Rev. Lett. 82, 4142–4145 (1999). [CrossRef]

3.

J. X. Cheng, A. Volkmer, L. D. Book, and X. S. Xie, “An epi-detected coherent anti-Stokes Raman scattering (E-CARS) microscope with high spectral resolution and high sensitivity,” J. Phys. Chem. B 105, 1277–1280 (2001). [CrossRef]

4.

A. Volkmer, J.-X., and X. S. Xie, “Vibrational imaging with high sensitivity via epidetected coherent anti-Stokes Raman scattering,” Phys. Rev. Lett. 87, 023901 (2001). [CrossRef]

5.

E. O. Potma, D. J. Jones, J.-X. Cheng, X. S. Xie, and J. Ye, “High-sensitivity coherent anti-Stokes Raman scattering microscopy with two tightly synchronized picosecond lasers,” Opt. Lett. 27, 1168–1170 (2002). [CrossRef]

6.

F. Ganikhanov, S. Carrasco, X. S. Xie, M. Katz, W. Seitz, and D. Kopf, “Broadly tunable dual-wavelength light source for coherent anti-Stokes Raman scattering microscopy,” Opt. Lett. 31, 1292–1294 (2006). [CrossRef] [PubMed]

7.

G. Cerullo and S. De Silvestri, “Ultrafast optical parametric amplifiers,” Rev. Sci. Instrum. 74, 1–18 (2003). [CrossRef]

8.

L. Gundlach, R. Ernstorfer, E. Riedle, R. Eichberger, and F. Willig, “Femtosecond two-photon photoemission at 150 KHz utilizing two noncollinear optical parametric amplifiers for measureing ultrafast electron dynamics,” Appl. Phys. B 80, 727–731 (2005). [CrossRef]

9.

G. I. Petrov, V. V. Yakovlev, and K. Vodopyanov, “Generation of tunable picosecond MHz repetition rate mid-IR pulses by optical parametric amplification of white-light continuum in GaSe,” Conference on Lasers and Electro-Optics (CLEO) (IEEE Cat. No. 05TH8796), pt. 1, Vol. 1 pp. 642–644 (2005).

10.

H. Vanherzeele, “Picosecond laser system continuously tunable in the 0.6–4 µm range,” Appl. Opt. 29, 2246–2258 (1990). [CrossRef] [PubMed]

11.

D. E. Gragson, D. S. Alavi, and G. L. Richmond, “Tunable picosecond laser system based on parametric amplification in KTP with a Ti:Sapphire amplifier,” Opt. Lett. 20, 1991–1993 (1995). [CrossRef] [PubMed]

12.

F. Rotermund, V. Petrov, F. Noack, V. Pasiskevicius, J. Hellström, and F. Laurell, “Efficient femtosecond travelling-wave optical parametric amplification in periodically poled KTiOPO4,” Opt. Lett. 24, 1874–1876 (1999). [CrossRef]

13.

F. Rotermund, V. Petrov, F. Noack, V. Pasiskevicius, J. Hellström, F. Laurell, H. Hundermark, P. Adel, and C. Fallinch, “Compact all-diode-pumped femtosecond laser source based on chirped pulse amplification in periodically poled KTiOPO4,” Electron. Lett. 38, 561–562 (2002). [CrossRef]

14.

I. Jovanovic, J. R. Schmidt, and Ch. Ebbers, “Optical parametric chirped-pulse amplification in periodically poled KTiOPO4,” Appl. Phys. Lett. 83, 4125–4127 (2003). [CrossRef]

15.

V. Petrov, F. Noack, F. Rotermund, V. Pasiskevicius, A. Fragemann, F. Laurell, H. Hundermark, P. Adel, and C. Fallinch, “Efficient all-diode-pumped double stage femtosecond optical parametric chirped pulse amplification at 1 kHz with periodically poled KTiOPO4,” Jpn. J. Appl. Phys. 42, L1327–L1329 (2003). [CrossRef]

16.

A. Fragemann, V. Pasiskevicius, and F. Laurell, “Optical parametric amplification of a gain-switched picosecond laser diode,” Opt. Express , 13, 6482–6489 (2005). [CrossRef] [PubMed]

17.

A. Fragemann, V. Pasiskevicius, and F. Laurell, “Broadband nondegenerate optical parametric amplification in mid infrared with periodically poled KTiOPO4,” Opt. Lett. 30, 2296–2298 (2005). [CrossRef] [PubMed]

18.

M. Tiihonen, V. Pasiskevicius, A. Fragemann, C. Canalias, and F. Laurell, “Ultrabroad gain in optical parametric generator with periodically poled KTiOPO4 and RbTiOPO4,” in press Appl. Phys B (2006).

OCIS Codes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(190.7110) Nonlinear optics : Ultrafast nonlinear optics

ToC Category:
Nonlinear Optics

History
Original Manuscript: May 17, 2006
Revised Manuscript: August 22, 2006
Manuscript Accepted: August 25, 2006
Published: September 18, 2006

Citation
M. Tiihonen, V. Pasiskevicius, and F. Laurell, "Broadly tunable picosecond narrowband pulses in a periodically-poled KTiOPO4 parametric amplifier," Opt. Express 14, 8728-8736 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-19-8728


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References

  1. C. J. Hirschmugl, "Frontiers in infrared spectroscopy at surfaces and interfaces," Surf. Sci. 500, 577-604 (2002). [CrossRef]
  2. A. Zambusch, G. R. Holton, and X. S. Xie, "Three-dimensional vibrational imaging by coherent anti-Stokes Raman scattering," Phys. Rev. Lett. 82, 4142-4145 (1999). [CrossRef]
  3. J. X. Cheng, A. Volkmer, L. D. Book, and X. S. Xie, "An epi-detected coherent anti-Stokes Raman scattering (E-CARS) microscope with high spectral resolution and high sensitivity," J. Phys. Chem. B 105, 1277-1280 (2001). [CrossRef]
  4. A. Volkmer, J.-X. and X. S. Xie, "Vibrational imaging with high sensitivity via epidetected coherent anti-Stokes Raman scattering," Phys. Rev. Lett. 87, 023901 (2001). [CrossRef]
  5. E. O. Potma, D. J. Jones, J.-X. Cheng, X. S. Xie, and J. Ye, "High-sensitivity coherent anti-Stokes Raman scattering microscopy with two tightly synchronized picosecond lasers," Opt. Lett. 27, 1168-1170 (2002). [CrossRef]
  6. F. Ganikhanov, S. Carrasco, X. S. Xie, M. Katz, W. Seitz, and D. Kopf, "Broadly tunable dual-wavelength light source for coherent anti-Stokes Raman scattering microscopy," Opt. Lett. 31, 1292-1294 (2006). [CrossRef] [PubMed]
  7. G. Cerullo, and S. De Silvestri, "Ultrafast optical parametric amplifiers," Rev. Sci. Instrum. 74, 1-18 (2003). [CrossRef]
  8. L. Gundlach, R. Ernstorfer, E. Riedle, R. Eichberger, and F. Willig, "Femtosecond two-photon photoemission at 150 KHz utilizing two noncollinear optical parametric amplifiers for measureing ultrafast electron dynamics," Appl. Phys. B 80, 727-731 (2005). [CrossRef]
  9. G. I. Petrov, V. V. Yakovlev, and K. Vodopyanov, "Generation of tunable picosecond MHz repetition rate mid-IR pulses by optical parametric amplification of white-light continuum in GaSe," Conference on Lasers and Electro-Optics (CLEO) (IEEE Cat. No. 05TH8796), pt. 1, Vol. 1 pp. 642-644 (2005).
  10. H. Vanherzeele, "Picosecond laser system continuously tunable in the 0.6-4 µm range," Appl. Opt. 29, 2246-2258 (1990). [CrossRef] [PubMed]
  11. D. E. Gragson, D. S. Alavi, and G. L. Richmond, "Tunable picosecond laser system based on parametric amplification in KTP with a Ti:Sapphire amplifier," Opt. Lett. 20, 1991-1993 (1995). [CrossRef] [PubMed]
  12. F. Rotermund, V. Petrov, F. Noack, V. Pasiskevicius, J. Hellström, and F. Laurell, "Efficient femtosecond travelling-wave optical parametric amplification in periodically poled KTiOPO4," Opt. Lett. 24, 1874-1876 (1999). [CrossRef]
  13. F. Rotermund, V. Petrov, F. Noack, V. Pasiskevicius, J. Hellström, F. Laurell, H. Hundermark, P. Adel, and C. Fallinch, "Compact all-diode-pumped femtosecond laser source based on chirped pulse amplification in periodically poled KTiOPO4," Electron. Lett. 38, 561-562 (2002). [CrossRef]
  14. I. Jovanovic, J. R. Schmidt, and Ch. Ebbers, "Optical parametric chirped-pulse amplification in periodically poled KTiOPO4," Appl. Phys. Lett. 83, 4125-4127 (2003). [CrossRef]
  15. V. Petrov, F. Noack, F. Rotermund, V. Pasiskevicius, A. Fragemann, F. Laurell, H. Hundermark, P. Adel, and C. Fallinch, "Efficient all-diode-pumped double stage femtosecond optical parametric chirped pulse amplification at 1 kHz with periodically poled KTiOPO4," Jpn. J. Appl. Phys. 42, L1327-L1329 (2003). [CrossRef]
  16. A. Fragemann, V. Pasiskevicius, and F. Laurell, "Optical parametric amplification of a gain-switched picosecond laser diode," Opt. Express,  13, 6482-6489 (2005). [CrossRef] [PubMed]
  17. A. Fragemann, V. Pasiskevicius, and F. Laurell, "Broadband nondegenerate optical parametric amplification in mid infrared with periodically poled KTiOPO4," Opt. Lett. 30, 2296-2298 (2005). [CrossRef] [PubMed]
  18. M. Tiihonen, V. Pasiskevicius, A. Fragemann, C. Canalias, and F. Laurell, "Ultrabroad gain in optical parametric generator with periodically poled KTiOPO4 and RbTiOPO4," in press Appl. Phys B (2006).

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