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Optics Express

  • Vol. 17, Iss. 7 — Mar. 30, 2009
  • pp: 5630–5635
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Passively modelocked, diode-pumped Yb:KYW femtosecond oscillator with 1 GHz repetition rate

P. Wasylczyk, P. Wnuk, and C. Radzewicz  »View Author Affiliations


Optics Express, Vol. 17, Issue 7, pp. 5630-5635 (2009)
http://dx.doi.org/10.1364/OE.17.005630


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Abstract

We demonstrate a high repetition rate, single mode fiber-coupled diode pumped, Yb:KYW laser in a four mirror ring cavity configuration and study its performance in soft aperture, Kerr lens mode-locked operation at around 1.04 μm.

© 2009 Optical Society of America

1. Introduction

Since the first demonstration of the passively modelocked, femtosecond Ti:sapphire oscillator in the early nineties [1

1. D. E. Spence, P. N. Kean, and W. Sibbett, “60-fsec pulse generation from a self-mode-locked Ti:sapphire laser,” Opt. Lett. 16, 42–44 (1991). [CrossRef] [PubMed]

], this laser has found countless applications and a number of its distinct variations have been developed. Among these there are the two extremes in terms of the pulse repetition rate governed by the laser cavity length. One reaches towards long cavities (extended with the q-preserving Herriott cells [2

2. S. H. Cho, B. E. Bouma, E. P. Ippen, and J. G. Fujimoto, “Low-repetition-rate high-peak-power Kerr-lens mode-locked Ti:Al2O3 laser with multi-pass cavity,” Opt. Lett. 24, 417–419 (1999). [CrossRef]

], typically up to several meters) and thus increases the pulse energy up to the 100-nJ level [3

3. S. H. Cho, F. X. Kartner, U. Morgner, E. P. Ippen, J. G. Fujimoto, J. E. Cunningham, and W. H. Knox, “Generation of 90-nJ pulses with 4-MHz repetition-rate Kerr-lens mode-locked Ti:Al2O3 laser operating with net positive and negative intracavity dispersion,” Opt. Lett. 26, 560–562 (2001). [CrossRef]

] at the expense of a low repetition rate. At the other extreme the high repetition rate designs [4

4. A. Bartels, T. Dekorsy, and H. Kurz, “Femtosecond Ti:sapphire ring laser with 2-GHz repetition rate and its application in time-resolved spectroscopy,” Opt. Lett. 24, 996–998 (1999). [CrossRef]

, 5

5. G. T. Nogueira, B. Xu, M. Dantus, and F. C. Cruz, “Broadband 2.12 GHz Ti:sapphire laser compressed to 5.9 femtoseconds using MIIPS,” Opt. Express 16, 10033–10038 (2008). [CrossRef] [PubMed]

] are now reaching ten gigahertz with minute cavity layouts [6

6. A. Bartels, D. Heinecke, and S. A. Diddams, “Passively mode-locked 10 GHz femtosecond Ti:sapphire laser,” Opt. Lett. 33, 1905–1907 (2008). [CrossRef] [PubMed]

]. The latter has become increasingly important with the advent of the femtosecond laser based optical frequency comb technology developed at the turn of the century [7

7. S. A. Diddams, D. J. Jones, L. S. Ma, S. T. Cundiff, and J. L. Hall, “Optical frequency measurement across a 104-THz gap with a femtosecond laser frequency comb,” Opt. Lett. 25, 186–188 (2000). [CrossRef]

, 8

8. D. J. Jones, S. A. Diddams, J. K. Ranka, A. Stentz, R. S. Windeler, J. L. Hall, and S. T. Cundiff, “Carrier-envelope phase control of femtosecond mode-locked lasers and direct optical frequency synthesis,” Science 288, 635–639 (2000). [CrossRef] [PubMed]

]. Gigahertz laser based optical frequency combs [9

9. T. M. Fortier, A. Bartels, and S. A. Diddams, “Octave-spanning Ti:sapphire laser with a repetition rate >1GHz for optical frequency measurements and comparisons,” Opt. Lett. 31, 1011–1013 (2006). [CrossRef] [PubMed]

, 10

10. A. Bartels, R. Gebs, M. S. Kirchner, and S. A. Diddams, “Spectrally resloved optical frequency comb from a self-referenced 5 GHz femtosecond laser,” Opt. Lett. 32, 2553–2555 (2007). [CrossRef] [PubMed]

] not only outperform the early designs in compactness, better mechanical stability and easier access to the individual comb frequencies in the preliminary characterization but, more importantly, provide a significantly higher signal-to-noise ratio in the homodyne beats measurement simply since for a given average power of the laser the optical power per comb mode is proportional to the repetition rate.

Apart from the Ti:sapphire, only a few other lasers has been demonstrated to operate in the high repetition rate, passively modelocked configuration: Nd:YVO[11

11. H. C. Liang, Ross C. C. Chen, Y. J. Huang, W. Su, and Y. F. Chen, “Compact efficient multi-GHz Kerr-lens mode-locked diode-pumped Nd:YVO4 laser,” Opt. Express 16, 21149–21154 (2008). [CrossRef] [PubMed]

], Cr:YAG[12

12. T. Tomaru, “Two-element-cavity femtosecond Cr4+:YAG laser operating at a 2.6 GHz repetition rate,” Opt. Lett. 26, 1439–1441 (2001). [CrossRef]

, 13

13. C. G. Leburn, A. A. Lagatsky, C. T. A. Brown, and W. Sibbett, “Femtosecond Cr4+:YAG laser with 4 GHz pulse repetition rate,” Electron. Lett. 40, 805–807 (2004). [CrossRef]

], Cr:forsterite[14

14. I. Thormann, A. Bartels, K. L. Corwin, N. R. Newbury, L. Hollberg, S. A. Diddams, J. W. Nicholson, and M. F. Yan, “420-MHz Cr:forsterite femtosecind ring laser and continuum generation in the 1-2-μm range,” Opt. Lett. 28, 1368–1370 (2003). [CrossRef]

] and Er:Yb:glass[15

15. A. E. H. Oehler, T. Südmeyer, K. J. Weingarten, and U. Keller, “100 GHz passively mode-locked Er:Yr:glass laser at 1.5 μm with 1.6-ps pulses,” Opt. Express 16, 21930–21935 (2008). [CrossRef] [PubMed]

].

The marriage of the enabling Yb:crystal femtosecond laser technology and the laser frequency comb stabilization techniques first saw light only this year with the demonstration of the optical frequency comb with stabilized carrier-envelope offset based on a diode pumped Yb:KYW oscillator by Meyer, Squier and Diddams [25

25. S. A. Meyer, J. A. Squier, and S. A. Diddams, “Diode-pumped Yb:KYW femtosecond laser frequency comb with stabilized carrier-envelope offset frequency,” Eur. Phys. J. D 48, 19–26 (2008). [CrossRef]

].

The gigahertz, diode pumped, high efficiency Yb:KYW oscillator demonstrated here offers an attractive alternative in the quest for compact and robust pulsed laser sources with high repetition rates. The basic design criteria were based on these of high repetition rate Ti:sapphire lasers [26

26. M. S. Kirchner, T. M. Fortier, A. Bartels, and S. A. Diddams, “A low-threshold self-referenced Ti:Sapphire optical frequency comb,” Opt. Express 14, 9531–9536 (2006). [CrossRef] [PubMed]

] – small cavity mode waist in the laser crystal, tight pump focusing and a low transmission output coupler were used to obtain a high intensity in the crystal needed to support the mode locking by Kerr lensing.

2. Experimental setup

The laser schematics is presented in Fig. 1. The cavity is a four-mirror bow-tie ring resonator. Two concave mirror have the radii of curvature of 30 mm and the two other mirrors including the output coupler are flat on 30 min wedged substrates.

Fig. 1. Gigahertz Yb:KYW laser layout. LD - 980 nm, 500 mW single mode fiber coupled laser diode, CL - f=15 mm collimating lens, FL - f=30 mm focusing lens, PM - pump mirror (HT@980 nm and HR@1040±20 nm), X - 1.2 mm Yb:KYW crystal, -800 - negative dispersion mirror (-800 fs2@1030 nm), OC - output coupler. The laser cavity is drawn to scale. Inset shows the 0.65 GHz cavity with increased negative dispersion (see text for details).

The cavity astigmatism was compensated in a standard manner by tilting the concave mirrors. The tilt angle (14.8 deg beam-to-beam) was calculated from the formula similar to the one given in [27

27. H. Kogelnik, E. Ippen, A. Dienes, and C. Shank, “Astimatically compensated cavities for CW dye lasers,” IEEE J. Quantum Electron. 8, 373–379 (1972). [CrossRef]

]. We use the pump mirror at its center to avoid the transmitted pump beam deviation, while the other concave mirror was used near the edge to allow for more space between its edge and the laser beam.

We have also tested a slightly modified laser cavity design, shown in the inset of Fig. 1. Here both concave mirror were of the same type, and the cavity was folded twice to allow for introducing an additional -800 fs2 chirped mirror. Due to mechanical constrains, the measured repetition rate was 0.65 GHz in this configuration. The laser produced around 60 mW of the output power (unidirectional) and after careful alignment the modelocking was self starting when the cavity was blocked and opened again.

The crystal was a commercially available (Crystals of Syberia) 1.2 mm, Brewster cut, KYW doped with Yb at 10 at.%. Pump polarization was parallel to the crystal Nm axis and the pump propagated along the Np axis. The crystal had no active cooling.

To achieve optimal matching of the pump beam and the laser cavity mode we have chosen the single mode fiber coupled, single emiter laser diode (JDSU, 2900 series) that provided the maximum output power of 485 mW (in front of the crystal) at 980 nm ±0.5 nm . The fiber mode diameter is 4 μm and the fiber output beam was first collimated with an aspheric lens collimator of 15 mm focal length (AR coated, Thorlabs) and focused onto the Yb:KYW crystal with a 30 mm focal length plano-concave singlet (AR coated, CVI).The pump beam polarization direction was controlled by rotating the collimator in its mount.

All Yb:crystal, passively modelocked femtosecond lasers demonstrated up to date operate in the regime of a large negative group velocity dispersion. In our designs, the negative GVD was provided by chirped mirrors (Layertec) that, together with the Yb:KYW crystal, accounted for -1480 fs2 (-2280 fs2) of the GVD per round trip in the 1 GHZ (0.65 GHz) cavity around 1040 nm (Yb:KYW crystal GVD calculated from the manufacturer data equals 200 fs2/mm).

3. Laser performance

When optimized for the CW operation, the laser provided maximum output power of 147 mW at around 1040 nm with 485 mW of the pump power incident on the crystal and the the slope efficiency was 36% (compare Fig. 2(a)). The laser cavity stability region spans over 3 mm in the concave M1 mirror position.

Fig. 2. Laser CW output power as a function of the pump power incident on the crystal a) and the measured modelocked laser spectrum b).

When modelocked, the laser spectrum broadening is observed – the spectrum with 5.2 nm width, peaked at 1047 nm is presented in Fig. 2(b). The measured spectral width is sufficient to support pulses of approximately 200 fs duration. For other positions of mirror M1 we observed narrower (4.1 and 2.9 nm) spectra of similar shapes. This behavior is very similar to the one of our recently demonstrated Kerr lens modelocked femtosecond 82 MHz Yb:KYW oscillator [28

28. P. Wasylczyk and C. Radzewicz, “Design and Alignment Criteria for a Simple, Robust, Diode-Pumped Femtosecond Yb:KYW Oscillator,” Laser Phys. 19, 129–133 (2008). [CrossRef]

]. The maximum modelocked output power was 115 mW which corresponds to 24% of the incident pump to optical output efficiency. The pulse trace measured with a fast InGaAs photodiode and a 1 GHz bandwidth, 20 Gsamples/s oscilloscope is presented in the inset of Fig. 3. It is worth noting that this measurement setup is used at its limits when recording the 1 GHz pulse repetition rate transient. With the same setup we have also verified that no long-scale pulse energy modulation is present which could indicate the Q-switched operation of the laser. Finally, the laser RF spectrum centered at 1.0138 GHz was recorded with the spectrum analyzer – see Fig. 3. We have verified that no structures characteristic of Q-switching were present in this spectrum either.

Fig. 3. RF spectrum of the laser output measured with 24 kHz RBW. Normalized laser output trace is shown in the inset.

4. Conclusions and outlook

In conclusion, we have demonstrated what is to our knowledge the first passively modelocked, diode pumped, gigahertz-repetition rate Yb:crystal ring laser.

The presented high efficiency laser setup can be further improved by applying a two-side pumping with another pump diode and the same set of focusing optics. Given the output power reached with the current pump source, the laser should allow the supercontinuum generation in a microstructured photonic crystal fiber without external amplification of the pulses if the overall pump power is increased. With the carrier-envelope offset easily controlled by modulation of the pump diode power, this design is an excellent candidate for a simple and robust self-referenced optical frequency comb source.

Acknowledgments

This work has been supported financially by the Polish Government (MNiSW grants R02 043 02 and N N202 1489 33). P.W. gratefully acknowledges generous support of the Foundation for Polish Science founded by a grant from Iceland, Liechtenstein and Norway through the EEA Financial Mechanism.

References and links

1.

D. E. Spence, P. N. Kean, and W. Sibbett, “60-fsec pulse generation from a self-mode-locked Ti:sapphire laser,” Opt. Lett. 16, 42–44 (1991). [CrossRef] [PubMed]

2.

S. H. Cho, B. E. Bouma, E. P. Ippen, and J. G. Fujimoto, “Low-repetition-rate high-peak-power Kerr-lens mode-locked Ti:Al2O3 laser with multi-pass cavity,” Opt. Lett. 24, 417–419 (1999). [CrossRef]

3.

S. H. Cho, F. X. Kartner, U. Morgner, E. P. Ippen, J. G. Fujimoto, J. E. Cunningham, and W. H. Knox, “Generation of 90-nJ pulses with 4-MHz repetition-rate Kerr-lens mode-locked Ti:Al2O3 laser operating with net positive and negative intracavity dispersion,” Opt. Lett. 26, 560–562 (2001). [CrossRef]

4.

A. Bartels, T. Dekorsy, and H. Kurz, “Femtosecond Ti:sapphire ring laser with 2-GHz repetition rate and its application in time-resolved spectroscopy,” Opt. Lett. 24, 996–998 (1999). [CrossRef]

5.

G. T. Nogueira, B. Xu, M. Dantus, and F. C. Cruz, “Broadband 2.12 GHz Ti:sapphire laser compressed to 5.9 femtoseconds using MIIPS,” Opt. Express 16, 10033–10038 (2008). [CrossRef] [PubMed]

6.

A. Bartels, D. Heinecke, and S. A. Diddams, “Passively mode-locked 10 GHz femtosecond Ti:sapphire laser,” Opt. Lett. 33, 1905–1907 (2008). [CrossRef] [PubMed]

7.

S. A. Diddams, D. J. Jones, L. S. Ma, S. T. Cundiff, and J. L. Hall, “Optical frequency measurement across a 104-THz gap with a femtosecond laser frequency comb,” Opt. Lett. 25, 186–188 (2000). [CrossRef]

8.

D. J. Jones, S. A. Diddams, J. K. Ranka, A. Stentz, R. S. Windeler, J. L. Hall, and S. T. Cundiff, “Carrier-envelope phase control of femtosecond mode-locked lasers and direct optical frequency synthesis,” Science 288, 635–639 (2000). [CrossRef] [PubMed]

9.

T. M. Fortier, A. Bartels, and S. A. Diddams, “Octave-spanning Ti:sapphire laser with a repetition rate >1GHz for optical frequency measurements and comparisons,” Opt. Lett. 31, 1011–1013 (2006). [CrossRef] [PubMed]

10.

A. Bartels, R. Gebs, M. S. Kirchner, and S. A. Diddams, “Spectrally resloved optical frequency comb from a self-referenced 5 GHz femtosecond laser,” Opt. Lett. 32, 2553–2555 (2007). [CrossRef] [PubMed]

11.

H. C. Liang, Ross C. C. Chen, Y. J. Huang, W. Su, and Y. F. Chen, “Compact efficient multi-GHz Kerr-lens mode-locked diode-pumped Nd:YVO4 laser,” Opt. Express 16, 21149–21154 (2008). [CrossRef] [PubMed]

12.

T. Tomaru, “Two-element-cavity femtosecond Cr4+:YAG laser operating at a 2.6 GHz repetition rate,” Opt. Lett. 26, 1439–1441 (2001). [CrossRef]

13.

C. G. Leburn, A. A. Lagatsky, C. T. A. Brown, and W. Sibbett, “Femtosecond Cr4+:YAG laser with 4 GHz pulse repetition rate,” Electron. Lett. 40, 805–807 (2004). [CrossRef]

14.

I. Thormann, A. Bartels, K. L. Corwin, N. R. Newbury, L. Hollberg, S. A. Diddams, J. W. Nicholson, and M. F. Yan, “420-MHz Cr:forsterite femtosecind ring laser and continuum generation in the 1-2-μm range,” Opt. Lett. 28, 1368–1370 (2003). [CrossRef]

15.

A. E. H. Oehler, T. Südmeyer, K. J. Weingarten, and U. Keller, “100 GHz passively mode-locked Er:Yr:glass laser at 1.5 μm with 1.6-ps pulses,” Opt. Express 16, 21930–21935 (2008). [CrossRef] [PubMed]

16.

F. Brunner, G. J. Sphler, J. Aus der Au, L. Krainer, F. Morier-Genoud, R. Paschotta, N. Lichtenstein, S. Weiss, C. Harder, A. A. Lagatsky, A. Abdolvand, N. V. Kuleshov, and U. Keller, “Diode-pumped femtosecond Yb:KGd(WO4)2 laser with 1.1-W average power,” Opt. Lett. 25, 1119–1121 (2000). [CrossRef]

17.

H. Liu, J. Nees, and G. Mourou, “Diode-pumped Kerr-lens mode-locked Yb:KY(WO4)2 laser,” Opt. Lett. 26, 1723–1725 (2001). [CrossRef]

18.

A. A. Lagatsky, C. T. A. Brown, and W. Sibbett, “Highly efficient and low threshold diode-pumped Kerr-lens mode-locked Yb:KYW laser,” Opt. Express 12, 3928–3933 (2004). [CrossRef] [PubMed]

19.

F. Druon, S. Chnais, P. Raybaut, F. Balembois, P. Georges, R. Gaum, G. Aka, B. Viana, S. Mohr, and D. Kopf, “Diode-pumped Yb:Sr3Y(BO3)3 femtosecond laser,” Opt. Lett. 27, 197–199 (2002). [CrossRef]

20.

A. Lucca, G. Debourg, M. Jacquemet, F. Druon, F. Balembois, P. Geoges, P. Camy, J. L. Doualan, and R. Mont-corg, “High-power diode-pumped Yb3+:CaF2 femtosecond laser,” Opt. Lett. 29, 2767–2769 (2004). [CrossRef] [PubMed]

21.

Y. Zaouter, J. Didierjean, F. Balembois, G. Lucas Leclin, F. Druon, P. Georges, J. Petit, P. Goldner, and B. Viana, “47-fs diode-pumped Yb3+:CaGdAlO4 laser,” Opt. Lett. 31, 119–121 (2006). [CrossRef] [PubMed]

22.

F. Thibault, D. Pelenc, F. Druon, Y. Zaouter, M. Jacquemet, and P. Georges, “Efficient diode-pumped Yb3+:Y2SiO5 and Yb3+:Lu2SiO5 high-power femtosecond laser operation,” Opt. Lett. 31, 1555–1557 (2006). [CrossRef] [PubMed]

23.

A. A. Lagatsky, A. R. Sarmani, C. T. A. Brown, W. Sibbett, V. E. Kisel, A. G. Selivanov, I. A. Denisov, A. E. Troshin, K. V. Yumashev, Kuleshov N. V., V. N. Matrosov, T. A. Matrosova, and M. I. Kupchenko, “Yb3+-doped YVO4 crystal for efficient Kerr-lens mode locking in solid-state lasers,” Opt. Lett. 30, 3234–3236 (2005). [CrossRef] [PubMed]

24.

C. Honninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giesen, W. Seeber, and U. Keller, “Ultrafast ytterbium-doped bulk laser and laser amplifiers,” Appl. Phys. B 69, 3–17 (1999). [CrossRef]

25.

S. A. Meyer, J. A. Squier, and S. A. Diddams, “Diode-pumped Yb:KYW femtosecond laser frequency comb with stabilized carrier-envelope offset frequency,” Eur. Phys. J. D 48, 19–26 (2008). [CrossRef]

26.

M. S. Kirchner, T. M. Fortier, A. Bartels, and S. A. Diddams, “A low-threshold self-referenced Ti:Sapphire optical frequency comb,” Opt. Express 14, 9531–9536 (2006). [CrossRef] [PubMed]

27.

H. Kogelnik, E. Ippen, A. Dienes, and C. Shank, “Astimatically compensated cavities for CW dye lasers,” IEEE J. Quantum Electron. 8, 373–379 (1972). [CrossRef]

28.

P. Wasylczyk and C. Radzewicz, “Design and Alignment Criteria for a Simple, Robust, Diode-Pumped Femtosecond Yb:KYW Oscillator,” Laser Phys. 19, 129–133 (2008). [CrossRef]

OCIS Codes
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.3615) Lasers and laser optics : Lasers, ytterbium

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: January 6, 2009
Revised Manuscript: February 27, 2009
Manuscript Accepted: March 1, 2009
Published: March 25, 2009

Citation
P. Wasylczyk, P. Wnuk, and C. Radzewicz, "Passively modelocked, diode-pumped Yb:KYW femtosecond oscillator with 1 GHz repetition rate," Opt. Express 17, 5630-5635 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-7-5630


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References

  1. D. E. Spence, P. N. Kean, and W. Sibbett, "60-fsec pulse generation from a self-mode-locked Ti:sapphire laser," Opt. Lett. 16, 42-44 (1991). [CrossRef] [PubMed]
  2. S. H. Cho, B. E. Bouma, E. P. Ippen, and J. G. Fujimoto, "Low-repetition-rate high-peak-power Kerr-lens modelocked Ti:Al2O3 laser with multi-pass cavity," Opt. Lett. 24, 417-419 (1999). [CrossRef]
  3. S. H. Cho, F. X. Kartner, U. Morgner, E. P. Ippen, J. G. Fujimoto, J. E. Cunningham, and W. H. Knox, "Generation of 90-nJ pulses with 4-MHz repetition-rate Kerr-lens mode-locked Ti:Al2O3 laser operating with net positive and negative intracavity dispersion," Opt. Lett. 26, 560-562 (2001). [CrossRef]
  4. A. Bartels, T. Dekorsy, and H. Kurz, "Femtosecond Ti:sapphire ring laser with 2-GHz repetition rate and its application in time-resolved spectroscopy," Opt. Lett. 24, 996-998 (1999). [CrossRef]
  5. G. T. Nogueira, B. Xu, M. Dantus, and F. C. Cruz, "Broadband 2.12 GHz Ti:sapphire laser compressed to 5.9 femtoseconds using MIIPS," Opt. Express 16, 10033-10038 (2008). [CrossRef] [PubMed]
  6. A. Bartels, D. Heinecke, and S. A. Diddams, "Passively mode-locked 10 GHz femtosecond Ti:sapphire laser," Opt. Lett. 33, 1905-1907 (2008). [CrossRef] [PubMed]
  7. S. A. Diddams, D. J. Jones, L. S. Ma, S. T. Cundiff, and J. L. Hall, "Optical frequency measurement across a 104-THz gap with a femtosecond laser frequency comb," Opt. Lett. 25, 186-188 (2000). [CrossRef]
  8. D. J. Jones, S. A. Diddams, J. K. Ranka, A. Stentz, R. S. Windeler, J. L. Hall, and S. T. Cundiff, "Carrier-envelope phase control of femtosecond mode-locked lasers and direct optical frequency synthesis," Science 288, 635-639 (2000). [CrossRef] [PubMed]
  9. T. M. Fortier, A. Bartels, and S. A. Diddams, "Octave-spanning Ti:sapphire laser with a repetition rate >1GHz for optical frequency measurements and comparisons," Opt. Lett. 31, 1011-1013 (2006). [CrossRef] [PubMed]
  10. A. Bartels, R. Gebs, M. S. Kirchner, and S. A. Diddams, "Spectrally resloved optical frequency comb from a self-referenced 5 GHz femtosecond laser," Opt. Lett. 32, 2553-2555 (2007). [CrossRef] [PubMed]
  11. H. C. Liang, RossC. C. Chen, Y. J. Huang, W. Su, and Y. F. Chen, "Compact efficient multi-GHz Kerr-lens mode-locked diode-pumped Nd:YVO4 laser," Opt. Express 16, 21149-21154 (2008). [CrossRef] [PubMed]
  12. T. Tomaru, "Two-element-cavity femtosecond Cr4+:YAG laser operating at a 2.6 GHz repetition rate," Opt. Lett. 26, 1439-1441 (2001). [CrossRef]
  13. C. G. Leburn, A. A. Lagatsky. C. T. A. Brown, and W. Sibbett, "Femtosecond Cr4+:YAG laser with 4 GHz pulse repetition rate," Electron. Lett. 40, 805-807 (2004). [CrossRef]
  14. I. Thormann, A. Bartels, K. L. Corwin, N. R. Newbury, L. Hollberg, S. A. Diddams, J. W. Nicholson, and M. F. Yan, "420-MHz Cr:forsterite femtosecind ring laser and continuum generation in the 1-2- m range," Opt. Lett. 28, 1368-1370 (2003). [CrossRef]
  15. A. E. H. Oehler, T. S¨udmeyer, K. J. Weingarten, and U. Keller, "100 GHz passively mode-locked Er:Yr:glass laser at 1.5 m with 1.6-ps pulses," Opt. Express 16, 21930-21935 (2008). [CrossRef] [PubMed]
  16. F. Brunner, G. J. Sphler, J. Aus der Au, L. Krainer, F. Morier-Genoud, R. Paschotta, N. Lichtenstein, S. Weiss, C. Harder, A. A. Lagatsky, A. Abdolvand, and N. V. Kuleshov, and U. Keller, "Diode-pumped femtosecond Yb:KGd(WO4)2 laser with 1.1-W average power," Opt. Lett. 25, 1119-1121 (2000). [CrossRef]
  17. H. Liu, J. Nees, and G. Mourou, "Diode-pumped Kerr-lens mode-locked Yb:KY(WO4)2 laser," Opt. Lett. 26, 1723-1725 (2001). [CrossRef]
  18. A. A. Lagatsky, C. T. A. Brown, and W. Sibbett, "Highly efficient and low threshold diode-pumped Kerr-lens mode-locked Yb:KYW laser," Opt. Express 12, 3928-3933 (2004). [CrossRef] [PubMed]
  19. F. Druon, S. Chnais, P. Raybaut, F. Balembois, P. Georges, R. Gaum, G. Aka, B. Viana, S. Mohr, and D. Kopf, "Diode-pumped Yb:Sr3Y(BO3)3 femtosecond laser," Opt. Lett. 27, 197-199 (2002). [CrossRef]
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  21. Y. Zaouter, J. Didierjean, F. Balembois, G. Lucas Leclin, F. Druon, and P. Georges, J. Petit, P. Goldner, and B. Viana, "47-fs diode-pumped Yb3+:CaGdAlO4 laser," Opt. Lett. 31, 119-121 (2006). [CrossRef] [PubMed]
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