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Journal of the Optical Society of America B

Journal of the Optical Society of America B

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Early Posting

Accepted papers to appear in an upcoming issue

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July


Cavity enhanced laser cooling for Yb3+-doped fluoride crystal using a low-power diode laser

  • Biao Zhong, Youhua Jia, Lin Chen, Yingchao Deng, Yangqin Chen, and Jianping Yin
  • received 12/19/2013; accepted 07/19/2014; posted 07/21/2014; Doc. ID 203382
  • [full text: PDF (833) KB)]
  • Abstract: A diode laser with a power of 178 mW is used to pump a 2.2%(wt) Yb3+-doped YLF4 crystal in an optical extra-cavity, and a resonant cavity enhanced laser cooling for Yb3+-doepd fluoride crystal is proposed and demonstrated. A pump laser enhancement factor of 8.6 is obtained with the resonant cavity. A cooling efficiency of 0.79% and a temperature drop of 12.3K/W are acquired with 82% of the incident laser power being absorbed by the sample. The combination of a low-cost, long life, light mass, small volume and low electricity power consumption diode laser and a simple resonant cavity for laser cooling of solids will have some important applications in optical refrigeration of space sensors and detectors, etc.

Keywords (OCIS):

  • (120.6810) Instrumentation, measurement, and metrology : Thermal effects
  • (140.4780) Lasers and laser optics : Optical resonators
  • (160.5690) Materials : Rare-earth-doped materials
  • (260.2510) Physical optics : Fluorescence
  • (300.2530) Spectroscopy : Fluorescence, laser-induced
  • (020.3320) Atomic and molecular physics : Laser cooling

(PNR2014) Photon counts statistics of squeezed and multi-mode thermal states of light on multiplexed on-off detectors

  • Radoslaw Chrapkiewicz
  • received 05/01/2014; accepted 07/17/2014; posted 07/21/2014; Doc. ID 211234
  • [full text: PDF (1864) KB)]
  • Abstract: Photon number resolving detectors can be extremely useful for studying the statistics of multiphoton quantum states of light. In this work we study the counts statistics of different states of light on multiplexed on-off detectors. We put a special emphasis on artificial non-classical features of measured statistics. We show new ways to derive analytical counts statistics and their moments. We are the first to derive statistics moments for multimode thermal states and we use them to determine empirical Mandel parameters and recently proposed subbinomial parameters suitable for tests of nonclassicality of the measured states. Additionally, we investigate subpoissonian properties of a joint counts statistics of the two mode squeezed state measured on a pair of multiplexed detectors.

Keywords (OCIS):

  • (030.5290) Coherence and statistical optics : Photon statistics
  • (040.5570) Detectors : Quantum detectors
  • (270.6570) Quantum optics : Squeezed states

Analysis of electromagnetically induced transparencybased quantum dot infrared photodetectors

  • Chandra Mohan Singh Negi and Jitendra Kumar
  • received 05/14/2014; accepted 07/14/2014; posted 07/21/2014; Doc. ID 212139
  • [full text: PDF (525) KB)]
  • Abstract: A quantum dot infrared photodetector based on intraband optical transitions among the various states within the valence band by considering the principle of electromagnetic induced transparency (EIT) is proposed and theoretically investigated. Absorption spectra of the probe beam and its dependence on the control beam and infrared (IR) signal, under the conditions of EIT have been studied. Incident IR signal itself does not generate any photocurrent. However, profound modification of the absorption characteristics of the probe beam by incident IR signal intensity leads to the photo current generation in the proposed photodetector. Thermal characterization of photodetector has been carried out through the evaluation of temperature dependence of quantum efficiency of the device.

Keywords (OCIS):

  • (040.3060) Detectors : Infrared
  • (230.5160) Optical devices : Photodetectors
  • (270.0270) Quantum optics : Quantum optics
  • (250.5590) Optoelectronics : Quantum-well, -wire and -dot devices

Nonreciprocal guided modes in photonic crystals of magnetic garnet particles with a planar defect

  • Aristi Christofi and Nikolaos Stefanou
  • received 05/30/2014; accepted 07/14/2014; posted 07/22/2014; Doc. ID 213171
  • [full text: PDF (1083) KB)]
  • Abstract: It is shown that a planar defect in the stacking sequence of an all-dielectric photonic crystal of garnet spheres supports strongly localized optical guided modes, which originate from Mie resonances of the individual spheres. If the defect breaks space-inversion symmetry and the garnet particles are magnetized in-plane, nonreciprocal and lossless transport of light on the defect plane, expected on the basis of group theory in the Voigt-Cotton-Mouton configuration, is demonstrated in ultrathin films of the defect crystal by means of full electrodynamic calculations using the layer-multiple-scattering method properly extended to photonic crystals of gyrotropic spheres.

Keywords (OCIS):

  • (160.3820) Materials : Magneto-optical materials
  • (290.4210) Scattering : Multiple scattering
  • (310.2790) Thin films : Guided waves
  • (160.5293) Materials : Photonic bandgap materials

SLAB PHOTONIC CRYSTALS WITH DIMER CYLINDER BASES

  • Erin Riley and Chekesha Liddell Watson
  • received 05/14/2014; accepted 07/13/2014; posted 07/14/2014; Doc. ID 211361
  • [full text: PDF (27831) KB)]
  • Abstract: The photonic band gap properties of centered rectangular dimer cylinder structures are reported. The theoretical model is inspired by a crystalline phase found for colloidal self-assembly of asymmetric dimers. The band structures as a function of degree of lobe fusion and degree of lobe symmetry are calculated in accordance with the tunable features resulting from seeded emulsion polymerization synthesis. The parameters are varied incrementally from single circular cross-section cylinders to lobe-tangent dimer cylinders. Odd, even and polarization independent gaps in the guided modes are found for direct and inverted slab structures. A wide range of shape parameter combinations in structures having low to moderate Brillouin zone distortion from hexagonal supported relative gap widths up to 19.1% (3-4 odd gap) and 14.6% (1-2 even gap) for direct structures. Slab thickness was tuned to overlap even and odd mode gap frequency ranges generating a 9.9% polarization independent gap. The results are compared with those from model centered rectangular slabs having dimer particle bases that limit the slab height. Inverted slab structures yielded a large maximum 40.4% 1-2 even mode gap and for up to 25% Brillouin zone distortion still supported significant gaps (> 32%).

Keywords (OCIS):

  • (160.4760) Materials : Optical properties
  • (160.5298) Materials : Photonic crystals

Efficient heralding of polarization-entangled photons from type-0 and type-II spontaneous parametric down-conversion in periodically poled KTiOPO₄

  • Fabian Steinlechner, Marta Gilaberte, Marc Jofre, Thomas Scheidl, Juan Torres, Valerio Pruneri, and Rupert Ursin
  • received 05/08/2014; accepted 07/11/2014; posted 07/11/2014; Doc. ID 209002
  • [full text: PDF (632) KB)]
  • Abstract: Ultra-bright sources of entangled photon pairs with high heralding efficiency are an important step in the pursuit of high bit-rate entanglement-base quantum key distribution, as well as an enabling tool for loss-sensitive quantum optics experiments. Here, we present a robust single-mode fiber coupled source of polarization-entangled photons around 810nm with both high brightness and heralding efficiency. Our approach is based on quasi-phase-matched spontaneous parametric down-conversion (SPDC) from periodically poled KTiOPO₄ in a Sagnac loop configuration. We demonstrate a high degree of two-photon polarization-entanglement for single-frequency-pumped type-0 and type-II SPDC, and conduct a conclusive comparison in terms of efficiency and spectral characteristics. In light of applications outside a laboratory environment, we evaluate the feasibility of pumping the nonlinear crystals with free-running laser diodes.

Keywords (OCIS):

  • (270.0270) Quantum optics : Quantum optics
  • (190.4975) Nonlinear optics : Parametric processes
  • (270.5565) Quantum optics : Quantum communications

Complete polarized-photons Bell states and Greenberger-Horne-Zeilinger states analysis assisted by atoms

  • Yan Xia, Yi-Hao Kang, and Pei-Min Lu
  • received 05/14/2014; accepted 07/11/2014; posted 07/11/2014; Doc. ID 212084
  • [full text: PDF (286) KB)]
  • Abstract: We propose an alternative protocol for complete polarized photons Bell states and Greenberger-Horne-Zeilinger states analysis assisted by atoms. In our protocol, the assistant atoms are trapped in cavities quantum electrodynamics (QED) which are feasible with current experimental technology. Comparing with previous protocols, we do not need cross-Kerr nonlinearity or hyperentanglement which is usually difficult to obtain. Moreover, the polarized photons entangled states will not be destroyed in our protocol. This might lead to a useful step toward the construction of more efficient quantum circuits and quantum algorithms.

Keywords (OCIS):

  • (270.0270) Quantum optics : Quantum optics
  • (270.5570) Quantum optics : Quantum detectors
  • (270.5565) Quantum optics : Quantum communications
  • (270.5585) Quantum optics : Quantum information and processing

Phase knob for switching steady-state behaviors from bistability to multi-stability via spontaneously generated coherence

  • Zhonghu Zhu, Ai-Xi Chen, Wen-Xing Yang, and Ray-Kuang Lee
  • received 05/14/2014; accepted 07/08/2014; posted 07/09/2014; Doc. ID 212078
  • [full text: PDF (497) KB)]
  • Abstract: We investigate theoretically the optical steady-state behavior in $N$ four-level Y-type atoms driven coherently by a probe laser and a single elliptically polarized field (EPF) by means of a unidirectional ring cavity. It is found that the optical bistability can be observed for a wide regime of frequency detuning of the probe field, intensity of the EPF and the atomic cooperation parameter. Interestingly enough, in principle the optical steady-state behavior can be switched from optical bistability to multistability or vice versa by adjusting the phase difference between two components of polarized electric field of the EPF if the perfect spontaneously generated coherence of atoms is included. Our results illustrate the potential to utilize EPF for all-optical switching in atomic system through the phase control, as well as a guidance in the design for possible experimental implementations.

Keywords (OCIS):

  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.1450) Nonlinear optics : Bistability
  • (270.0270) Quantum optics : Quantum optics
  • (270.1670) Quantum optics : Coherent optical effects

Light-trapping in guided modes of thin-film-silicon-on-silver waveguides by scattering from a nanostrip

  • Thomas Sondergaard, Yao-Chung Tsao, Peter Kristensen, Thomas Pedersen, and Kjeld Pedersen
  • received 05/22/2014; accepted 07/08/2014; posted 07/09/2014; Doc. ID 212606
  • [full text: PDF (848) KB)]
  • Abstract: Light-trapping in a waveguide configuration consisting of a thin planar film of hydrogenated amorphous silicon (aSi:H) on a planar silver back-reflector is studied theoretically and experimentally. Light-trapping is achieved by scattering of light from a silver or silicon nanostrip placed directly on the silicon-film surface. For thin films it is appropriate to think of light-trapping in terms of coupling into the guided modes of the air-aSi:H-silver waveguide configuration, which is the focus of this paper. Using the Green’s function surface integral equation method we calculate cross sections governing extinction, out-of-plane scattering, and scattering into guided modes. It is found for geometries with aSi:H-film thicknesses in the range of 50-500 nm that distinct peaks in extinction and scattering cross section spectra are located at wavelengths determined by the cut-off wavelengths of guided modes, and the wavelengths of those peaks are insensitive to the precise geometry of the scatterer. Measurements of extinction and scattering from an array of silver strips spaced by a large distance of 10 μm on the surface of a geometry with a 290 nm aSi:H-film are found to be in good agreement with theoretical predictions.

Keywords (OCIS):

  • (130.2790) Integrated optics : Guided waves
  • (240.6680) Optics at surfaces : Surface plasmons
  • (290.5820) Scattering : Scattering measurements
  • (050.1755) Diffraction and gratings : Computational electromagnetic methods
  • (290.5825) Scattering : Scattering theory
  • (050.6624) Diffraction and gratings : Subwavelength structures

Stochastic noise amplification in noninstantaneous Kerr media

  • G. da Silva, T. Lobo, and A. Canabarro
  • received 04/04/2014; accepted 07/03/2014; posted 07/07/2014; Doc. ID 209622
  • [full text: PDF (1314) KB)]
  • Abstract: Considering noninstantaneous Kerr nonlinearity, the propagation of a partially coherent optical beam are theoretically investigated by using extensions of the nonlinear Schr\"odinger equation (NLSE). In order to account for the partial coherence of the beam, a phase-diffusion model is used for the laser beam. To introduce the finite response time of the medium, a time dependent nonlinear response is incorporated in the system of NLSE using the Debye relaxation model. We analytically deduce the dispersion relation and numerically compute the gain spectra along with relevant second-order statistical quantities. A detailed study of how these statistical properties are influenced by the GVD regime as well as by the delayed nonlinear response of the material is presented. The distinct features for slow and fast delayed nonlinear response are also emphasized.

Keywords (OCIS):

  • (030.1640) Coherence and statistical optics : Coherence
  • (030.6600) Coherence and statistical optics : Statistical optics
  • (190.3100) Nonlinear optics : Instabilities and chaos
  • (190.5530) Nonlinear optics : Pulse propagation and temporal solitons
  • (190.5650) Nonlinear optics : Raman effect

Doppler broadened NICE-OHMS – Optimum modulation and demodulation conditions, cavity length, and modulation order

  • Isak Silander, Ove Axner, and Patrick Ehlers
  • received 05/01/2014; accepted 07/03/2014; posted 07/07/2014; Doc. ID 211230
  • [full text: PDF (637) KB)]
  • Abstract: Doppler broadened noise-immune cavity-enhanced optical heterodyne molecular spectrometry (Db-NICE-OHMS) has been scrutinized with respect to modulation and demodulation conditions (encompassing the modulation frequency, νm, the modulation index, β, and the detection phase, θ), the cavity length, L, and the modulation order, k, (defined as νm / νFSR where νFSR is the free-spectral range of the cavity) primarily in the Doppler limit but also for a specific situation in the Voigt regime (for equal Doppler and homogeneous width), both in the absence and presence of optical saturation. It is found that, for a system with a given cavity length, the optimum conditions (i.e. those that produce the largest NICE-OHMS signal) for an unsaturated transition in the Doppler limit comprise νm/ΓD = 1.6 (where ΓD is the HWHM of the Doppler width of the transition), β = 1.3, and θ = 0.78π. It is also found that the maximum is rather broad, the signal takes 95% of its maximum value for modulation frequencies in the entire 0.4 ≤ νm / ΓD ≤ 2.4 range. When optical saturation sets in, θ shifts towards the dispersion phase. The optimum conditions encompass k>1 whenever L > 0.35 LD and 2.6 LD for the dispersion and absorption modes of detection, respectively [where LD is a characteristic length given by c/(2 ΓD)]. Similar conditions are found for the case with a Voigt profile.

Keywords (OCIS):

  • (120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
  • (140.4780) Lasers and laser optics : Optical resonators
  • (300.6310) Spectroscopy : Spectroscopy, heterodyne
  • (300.6380) Spectroscopy : Spectroscopy, modulation
  • (300.6390) Spectroscopy : Spectroscopy, molecular
  • (140.3518) Lasers and laser optics : Lasers, frequency modulated

(PNR2014) Absolute spectral calibration of an intensified CCD camera using twin beams

  • Ondrej Haderka, Jan Perina, Vaclav Michalek, and Martin Hamar
  • received 04/23/2014; accepted 07/01/2014; posted 07/03/2014; Doc. ID 210718
  • [full text: PDF (568) KB)]
  • Abstract: Twin beams composed of photon pairs are used for absolute determination of quantum detection efficiency of an intensified CCD camera. A method of fitting the experimental photocount statistics with the paired superposition of signal and noise combined with additional determination of losses in the beams before the detector is used to reveal the detection efficiencies. The experiment has been performed in several spectral regions defined by the used interference filters. Also, the used twin beams have been reconstructed.

Keywords (OCIS):

  • (230.5160) Optical devices : Photodetectors
  • (270.0270) Quantum optics : Quantum optics
  • (270.5290) Quantum optics : Photon statistics
  • (190.4975) Nonlinear optics : Parametric processes

June


Phase-controlled optical bistability via electromagnetically induced absorption

  • Azar Vafafard, Hadisossadat Zaakeri, Lida Ebrahimi Zohravi, and Mohammad Mahmoudi
  • received 02/18/2014; accepted 06/30/2014; posted 06/30/2014; Doc. ID 205682
  • [full text: PDF (418) KB)]
  • Abstract: The optical properties of a four-level double $V$-type closed-loop system is studied in multi-photon resonance condition. It is shown that the phase-dependent electromagnetically induced transparency (EIT) window is established and by changing the relative phase of applied fields, the EIT switches to the electromagnetically induced absorption (EIA). Moreover, the optical bistability (OB) behavior of the system is studied and it is demonstrated that the Cross-Kerr effect induced OB depends on the relative phase of applied fields and it can be controlled by either intensity or relative phase of laser fields. By applying a microwave field to drive the hyperfine transition between two lower states, the optical properties change and the OB switches to the optical multistability (OM). This can be used as a detection of longer wavelengths than the visible light.

Keywords (OCIS):

  • (190.1450) Nonlinear optics : Bistability
  • (190.3270) Nonlinear optics : Kerr effect
  • (190.4180) Nonlinear optics : Multiphoton processes
  • (350.4010) Other areas of optics : Microwaves

Comparison of Amplitude Noise of a Fiber Optical Parametric Oscillator and a Supercontinuum Source

  • Leily Kiani, Thompson Lu, and Jay Sharping
  • received 03/18/2014; accepted 06/27/2014; posted 06/30/2014; Doc. ID 207831
  • [full text: PDF (1227) KB)]
  • Abstract: Fiber based optical parametric oscillators (FOPOs) are an alternative to supercontinuum light sources for nonlinear optical microscopy. In nonlinear microscopy implementations such as stimulated Raman scattering (SRS) and coherent anti-Stokes Raman scattering (CARS) the signal noise is proportional to the second or third order of the input intensity noise. It is not yet known how FOPO intensity noise levels compare with supercontinuum sources. We measure relative intensity noise (RIN) for a FOPO and a similar supercontinuum source as a function of input power and wavelength. We find that the FOPO sideband RIN can be as low as 5 dB above the shot noise limit of -150 dBc[Hz]-¹. This FOPO can reach RIN levels 50 dB below that of spectral slices of supercontinuum output in a similar spectral range.

Keywords (OCIS):

  • (190.4970) Nonlinear optics : Parametric oscillators and amplifiers
  • (180.4315) Microscopy : Nonlinear microscopy
  • (180.5655) Microscopy : Raman microscopy

Purcell effect for finite-length metal-coated and metal nanowires

  • Konstantin Filonenko, Morten Willatzen, and Vladimir Bordo
  • received 03/18/2014; accepted 06/27/2014; posted 06/30/2014; Doc. ID 208001
  • [full text: PDF (706) KB)]
  • Abstract: We investigate the modification (enhancement and suppression) of spontaneous emission rate of a dipole emitter in two configurations: inside a finite-length semiconductor nanowire surrounded by bulk metal and in the vicinity of a finite metal nanowire. Our analysis is based on a first-principle approach, which is reduced to a semi-analytic one in the limit of large nanowire aspect ratios. The numerical calculations are carried out for an emitter in a GaAs nanowire embedded in Ag or Au and for that nearby an Ag or Au nanowire in vacuum or dielectric. We consider in detail the Purcell and $\beta$ - factors as functions of the cylinder radius, the emitter position and transition frequency for both configurations. We contrast the results for finite-length nanowires with those obtained in the infinite-length approximation and find considerable difference in the Purcell factor magnitude.

Keywords (OCIS):

  • (240.5420) Optics at surfaces : Polaritons
  • (240.6680) Optics at surfaces : Surface plasmons
  • (260.3910) Physical optics : Metal optics
  • (070.5753) Fourier optics and signal processing : Resonators
  • (050.6624) Diffraction and gratings : Subwavelength structures
  • (250.5590) Optoelectronics : Quantum-well, -wire and -dot devices

Precision frequency measurement of N₂O transitions near 4.5 μm and above 150 μm

  • Wei-Jo Ting, Chun-Hung Chang, Shih-En Chen, Hsuan-Chen Chen, Jow-Tsong Shy, Brian Drouin, and Adam Daly
  • received 04/01/2014; accepted 06/27/2014; posted 06/30/2014; Doc. ID 209215
  • [full text: PDF (721) KB)]
  • Abstract: Frequency measurements are given for the 10⁰0 ← 00⁰0 band of N₂O near 4.5 μm and for pure rotational transitions beyond 151.5 μm. The infrared measurements utilize a periodically-poled lithium niobate (PPLN) based difference frequency generation (DFG) source locked to the saturated absorption center of an N₂O absorption line. The DFG frequency is calibrated by an optical frequency comb and an iodine hyperfine transition. We report 44 transitions ranging from J = 1 – 100 for both the P- and R- branches and the accuracy is better than 10 kHz for most transitions. In addition, 175 pure rotational transitions have been measured including 33 measurements with sub-Doppler precision (≤ 3 kHz), and 142 Doppler limited measurements. These are combined with other precision rotational and vibrational measurements to provide improved quantum mechanical parameters as well as frequency calibration tables for the N₂O bands near 4.5 μm.

Keywords (OCIS):

  • (300.6340) Spectroscopy : Spectroscopy, infrared
  • (300.6390) Spectroscopy : Spectroscopy, molecular
  • (300.6460) Spectroscopy : Spectroscopy, saturation

Local Field Effects for Spherical Quantum Dot Emitters in the Proximity to a Planar Dielectric Interface

  • J. Gordon and Yu. Gartstein
  • received 04/11/2014; accepted 06/27/2014; posted 06/30/2014; Doc. ID 209990
  • [full text: PDF (521) KB)]
  • Abstract: We use numerical solutions of macroscopic Maxwell's equations to study spontaneous emission rates of model spherical quantum dot (QD) emitters in the vicinity of a highly polarizable dielectric substrate. It is demonstrated that extra polarization of the QD body taking place in the interfacial region may lead to appreciable deviations from the rates that would be expected under the assumption of a fixed magnitude of the effective QD transition dipole moment. Illustrations are given for both radiative and non-radiative decay processes and potential experimental implications are discussed.

Keywords (OCIS):

  • (160.6000) Materials : Semiconductor materials
  • (260.2160) Physical optics : Energy transfer
  • (300.2140) Spectroscopy : Emission
  • (250.5590) Optoelectronics : Quantum-well, -wire and -dot devices

Feasibility of UV lasing without inversion in mercury vapor

  • Martin Sturm, Benjamin Rein, Thomas Walther, and Reinhold Walser
  • received 04/16/2014; accepted 06/24/2014; posted 06/26/2014; Doc. ID 210349
  • [full text: PDF (679) KB)]
  • Abstract: We investigate the feasibility of UV lasing without inversion at a wavelength of 253.7 nm utilizing interacting dark resonances in mercury vapor. Our theoretical analysis starts with radiation damped optical Bloch equations for all relevant 13 atomic levels. These master equations are generalized by considering technical phase noise of the driving lasers. From the Doppler broadened complex susceptibility we obtain the stationary output power from semiclassical laser theory. The finite overlap of the driving Gaussian laser beams defines an ellipsoidal inhomogeneous gain distribution. Therefore, we evaluate the intra-cavity field inside a ring laser self-consistently with Fourier optics. This analysis confirms the feasibility of UV lasing and reveals its dependence on experimental parameters.

Keywords (OCIS):

  • (140.4780) Lasers and laser optics : Optical resonators
  • (140.7240) Lasers and laser optics : UV, EUV, and X-ray lasers
  • (270.1670) Quantum optics : Coherent optical effects
  • (270.3430) Quantum optics : Laser theory

Quantifying the source of enhancement in experimental continuous variable quantum illumination

  • Sammy Ragy, Ivano Ruo Berchera, Ivo Degiovanni, Stefano Olivares, Matteo Paris, Gerardo Adesso, and Marco Genovese
  • received 04/04/2014; accepted 06/23/2014; posted 07/09/2014; Doc. ID 209289
  • [full text: PDF (730) KB)]
  • Abstract: A quantum illumination protocol exploits correlated light beams to enhance the probability of detection of a partially reflecting object lying in a very noisy background. Recently a simple photon-number-detection based implementation of a quantum illumination-like scheme has been provided in [Lopaeva {\it et al,}, Phys. Rev. Lett. {\bf 101}, 153603 (2013)] where the enhancement is preserved despite the loss of non-classicality. In the present paper we investigate the source for quantum advantage in that realization, by analysing the mutual information in an effective two-mode description of the light sources. We find that the improvement in the signal-to-noise ratio achieved by the entangled sources over the unentangled thermal ones is closely related to the respective ratio of mutual informations, with both quantities being specified by the squared ratio of the corresponding cross-correlations in the relevant regime of a highly thermalized background. An analysis of the experimental data confirms this theoretical result.

Keywords (OCIS):

  • (270.5570) Quantum optics : Quantum detectors
  • (270.6570) Quantum optics : Squeezed states
  • (270.5585) Quantum optics : Quantum information and processing

Generation of 130 mW of 397.5 nm tunable laser via ring-cavity-enhanced frequency doubling

  • Yashuai HAN, Xin WEN, Jiandong BAI, Baodong YANG, Yanhua WANG, Jun HE, and Junmin WANG
  • received 04/18/2014; accepted 06/23/2014; posted 06/24/2014; Doc. ID 210417
  • [full text: PDF (650) KB)]
  • Abstract: We report on the frequency doubling of a TA-boosted DBR continuous-wave (cw) laser system at 795 nm, using a PPKTP crystal placed in an external ring cavity. A tunable 397.5 nm violet laser power of 130 mW with a mode-matched input 795 nm laser power of 416 mW is obtained (conversion efficiency η = 31%), limited by thermally induced bistability. With a scanning cavity, the peak violet laser power rises up to 180 mW, corresponding to an overall efficiency of η = 43%. The generated 397.5 nm laser with good beam quality and satisfying power has huge potential use in quantum optics and cold atom physics.

Keywords (OCIS):

  • (140.2020) Lasers and laser optics : Diode lasers
  • (190.2620) Nonlinear optics : Harmonic generation and mixing
  • (070.5753) Fourier optics and signal processing : Resonators

Articles 1 to 20 of 29 Next Page >>





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