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Journal of the Optical Society of America B

Journal of the Optical Society of America B

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Accepted papers to appear in an upcoming issue

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September


Optical cavity squeezing of multi-wave mixing via dark state

  • Yiqi Zhang, Xun Zhang, Haixia Chen, Peiying Li, Mengqin Gao, Zihai Jiang, and Yanpeng Zhang
  • received 08/04/2014; accepted 09/17/2014; posted 09/18/2014; Doc. ID 217166
  • [full text: PDF (2900) KB)]
  • Abstract: We theoretically demonstrate the influence of dark states on single-mode, and two-mode optical squeezing in a four-level atomic-cavity coupling system through fifth- and third-order cascade nonlinearity. We first show the cone emissions of self-diffraction, and phase-conjugate spontaneous parametric (SP) four-wave mixing processes. And then, we inject coherent or Einstein-Podolsky-Rosen field into the SP-MWM channels to investigate the corresponding squeezing. The investigations have potential applications in quantum information processing.

Keywords (OCIS):

  • (190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
  • (190.4410) Nonlinear optics : Nonlinear optics, parametric processes
  • (270.6570) Quantum optics : Squeezed states
  • (190.4223) Nonlinear optics : Nonlinear wave mixing

Light-to-matter entanglement transfer in optomechanics

  • Eyob Sete, H. Eleuch, and C. H. Ooi
  • received 07/25/2014; accepted 09/17/2014; posted 09/18/2014; Doc. ID 217788
  • [full text: PDF (581) KB)]
  • Abstract: We analyze a scheme to entangle the states of the movable mirrors of two spatially separated nanoresonators via a broadband squeezed light. We show that it is possible to transfer the EPR-type continuous-variable entanglement from the squeezed light to the mechanical motions of the movable mirrors. An optimal entanglement transfer is achieved when the nanoresonators are tuned at resonance with the vibrational frequencies of the movable mirrors and when strong optomechanical coupling is attained. Stationary entanglement of the states of the movable mirrors as strong as that of the input squeezed light can be obtained for sufficiently large optomechanical cooperativity, achievable in currently available optomechanical systems. The scheme can be used to implement long distance quantum state transfer provided that the squeezed light interacts with the nanoresonators.

Keywords (OCIS):

  • (270.0270) Quantum optics : Quantum optics
  • (270.6570) Quantum optics : Squeezed states
  • (270.5585) Quantum optics : Quantum information and processing

Varying clad-core ratio fiber design for efficient lasing at 976 nm

  • Zhihua Huang, Honghuan Lin, Qi Li, Xiaobao Liang, Jianjun Wang, and Feng Jing
  • received 07/16/2014; accepted 09/16/2014; posted 09/17/2014; Doc. ID 216930
  • [full text: PDF (362) KB)]
  • Abstract: We propose and theoretically analyze an Ytterbium-doped double-clad fiber with tapered pump cladding for efficient lasing at $976~\rm{nm}$. Varying rather than uniform clad-core ratio is designed to achieve the uniform pump intensity profile beyond the transparency pump intensity by neglecting the vignetting effect. The output power of the proposed tapered $80/250$ fiber at $976~\text{nm}$ can be $1~\rm{kW}$ with an optic-optic efficiency near $80\%$ and a signal-to-noise ratio over $20~\text{dB}$ within $3~\text{m}$-long fiber under the double-pass pumping scheme.

Keywords (OCIS):

  • (140.3510) Lasers and laser optics : Lasers, fiber
  • (130.2755) Integrated optics : Glass waveguides
  • (140.3615) Lasers and laser optics : Lasers, ytterbium

Green Induced Infrared Absorption in Annealed Proton-Exchanged MgO:LiNbO3 Waveguides

  • Jian Sun and Chang-qing Xu
  • received 06/06/2014; accepted 09/15/2014; posted 09/16/2014; Doc. ID 213358
  • [full text: PDF (961) KB)]
  • Abstract: The green induced infrared absorption (GRIIRA) effect in annealed proton-exchanged (APE) MgO doped LiNbO3 (MgO:LiNbO3) waveguide was investigated experimentally. By directly measuring the green light induced transmittance change in the waveguides, the GRIIRA coefficients of the waveguides were studied at a light power density level of several MW/cm2. GRIIRA effects in APE MgO:LiNbO3 and none-doped MgO:LiNbO3 waveguide were compared. The GRIIRA induced temperature gradient from the waveguide core to the ambient environment was simulated using the measured results. Potential impacts of such temperature gradients on MgO:LiNbO3 based green lasers have been discussed. Optimization temperature control methods has also been discussed.

Keywords (OCIS):

  • (130.3730) Integrated optics : Lithium niobate
  • (140.7300) Lasers and laser optics : Visible lasers
  • (190.4360) Nonlinear optics : Nonlinear optics, devices
  • (230.7370) Optical devices : Waveguides

CW Pumped, Tunable mid-IR Fiber Optic Parametric Sources

  • S. Singh, V. Mishra, and S. Varshney
  • received 07/01/2014; accepted 09/15/2014; posted 09/16/2014; Doc. ID 214924
  • [full text: PDF (1017) KB)]
  • Abstract: In this paper, we investigate the effect of sixth-order dispersion parameter on the parametric amplification 8 characteristics of specially designed capillary-assisted chalcogenide core (As2S3) and silica clad step-index 9 optical fiber. The micro-sized capillary in the core of the fiber is filled with thermo-responsive liquid which 10 gives rise to tunable parametric gain in a 50 cm long fiber and generation of varying line-width non-Cherenkov 11 radiations from near-infrared to mid-infrared when a 3 μm continuous-wave pump is used. It is observed that 12 the sixth-order dispersion plays a crucial role in the creation of new sidebands.

Keywords (OCIS):

  • (060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
  • (190.4370) Nonlinear optics : Nonlinear optics, fibers
  • (190.4410) Nonlinear optics : Nonlinear optics, parametric processes

Fractal aggregate of hollow spherical nanoparticles: Engineering the absorption spectrum by hollow size

  • MirFaez Miri, Zahra Naeimi, and Kourosh Rezaei
  • received 07/18/2014; accepted 09/15/2014; posted 09/16/2014; Doc. ID 217254
  • [full text: PDF (444) KB)]
  • Abstract: We study the optical properties of aggregates of hollow gold nanoparticles. We study monodisperse and bidisperse random gas of particles and fractal cluster-cluster aggregates consisting of $1000$ particles. We use the coupled-dipole equations to describe the interaction of the electromagnetic wave with particles. We find that the particle core volume fraction can be tuned to minimize the full width at half maximum (FWHM) and to considerably shift the peak of the absorption spectrum. We find that the red shift, but not the FWHM of the peak, has a monotonic dependence on the particle core volume fraction. High pass, low pass and band rejection filters can be realized with random and fractal aggregates of hollow particles. In the case of fractal clusters, particle size dispersion has a deep influence on the overall shape of the spectrum.

Keywords (OCIS):

  • (230.3990) Optical devices : Micro-optical devices
  • (290.5850) Scattering : Scattering, particles
  • (350.2450) Other areas of optics : Filters, absorption
  • (160.4236) Materials : Nanomaterials

Mode Characteristics for Unidirectional Emission Microring Resonator Lasers

  • Xiu-Wen Ma, Xiao-Meng Lv, Yong-Zhen Huang, Yue-De Yang, Jin-Long Xiao, and Yun Du
  • received 06/19/2014; accepted 09/15/2014; posted 09/18/2014; Doc. ID 214419
  • [full text: PDF (2983) KB)]
  • Abstract: Mode characteristics are investigated numerically and experimentally for microring resonator lasers directly connected to an output waveguide. Optimized structural parameters for the microring resonators are proposed for realizing single mode and unidirectional emission operation. Finite-difference time-domain (FDTD) simulations indicate that the inner-wall of the microring resonators introduces additional radiation loss and scattering loss, and so suppresses the higher-order transverse modes with higher field distributions in the internal region of the microrings. However, the mode Q factors can be enhanced by several times for some modes with suitable inner-wall radii. AlGaInAs/InP microring lasers with inner-wall radii of 0, 5 and 7 μm and outer-wall radius of 10 μm connected to a 2 μm-wide output waveguide are fabricated by planar techniques. Lasing spectra with longitudinal mode wavelength intervals of 11-12 nm and the side mode suppression radio of 28-36dB are observed, and the suppressions of higher-order transverse modes are obtained as the prediction of the simulation results.

Keywords (OCIS):

  • (140.3410) Lasers and laser optics : Laser resonators
  • (140.3560) Lasers and laser optics : Lasers, ring
  • (140.3570) Lasers and laser optics : Lasers, single-mode
  • (230.5750) Optical devices : Resonators

Passive mode-locking under higher order effects

  • Theodoros Horikis and Mark Ablowitz
  • received 07/31/2014; accepted 09/13/2014; posted 09/17/2014; Doc. ID 219988
  • [full text: PDF (460) KB)]
  • Abstract: The response of a passive mode-locking mechanism, where gain and spectral filtering are saturated with the energy and loss saturated with the power, is examined under the presence of higher order effects. These include third order dispersion, self-steepening and Raman gain. The locking mechanism is maintained even with these terms; mode-locking occurs for both the anomalous and normal regimes. In the anomalous regime, these perturbations are found to affect the speed but not the structure of the (locked) pulses. In fact, these pulses behave like solitons of a classical nonlinear Schrodinger equation and as such a soliton perturbation theory is used to verify the numerical observations. In the normal regime, the effect of the perturbations is small, in line with recent experimental observations. The results in the normal regime are verified mathematically using a WKB type asymptotic theory. Finally, bi-solitons are found to behave as dark solitons on top of a stable background and are significantly affected by these perturbations.

Keywords (OCIS):

  • (140.4050) Lasers and laser optics : Mode-locked lasers
  • (190.5530) Nonlinear optics : Pulse propagation and temporal solitons
  • (320.5540) Ultrafast optics : Pulse shaping

Simple Single-Frame Measurement of the Complete Spatiotemporal Field of a Complex Ultrashort Pulse

  • Zhe Guang, Rick Trebino, Michelle Rhodes, and Matt Davis
  • received 05/23/2014; accepted 09/09/2014; posted 09/10/2014; Doc. ID 209742
  • [full text: PDF (2196) KB)]
  • Abstract: We further develop a simple device, called Spatially and Temporally Resolved Intensity and Phase Evaluation Device: Full Information from a Single Hologram (STRIPED FISH), for measuring the complete spatiotemporal intensity and phase, I(x,y,t) and Φ(x,y,t), of an arbitrary ultrashort pulse on a single camera frame. We have increased the measurable bandwidth, eliminated most aberrations, and improved the uniformity of the multiple holograms in the device. We demonstrate these improvements by making single-camera-frame measurements of spatiotemporally complex subpicosecond crossed and chirped pulses from a Ti:Sapphire oscillator. In order to display the resulting pairs of four-dimensional intensity-and-phase data, we also develop a method for generating intuitive movies of the measured pulses. With these improvements, this device and its resulting movies should be able to perform and intuitively display true single-shot spatiotemporal measurements of most current ultrashort pulses.

Keywords (OCIS):

  • (320.0320) Ultrafast optics : Ultrafast optics
  • (320.7100) Ultrafast optics : Ultrafast measurements

Measurement-based quantum computation with an optical two-dimensional Affleck-Kennedy-Lieb-Tasaki state

  • Kai Liu, Wen-Dong Li, and Yong-Jian Gu
  • received 03/24/2014; accepted 09/06/2014; posted 09/08/2014; Doc. ID 208713
  • [full text: PDF (720) KB)]
  • Abstract: Measurement-based quantum computation can achieve universal quantum computation via simply performing single-qubit measurements alone on an entangled resource state. Instead of the canonical resource state - cluster state, we pay great attention to another resource state Aeck-Kennedy-Lieb-Tasaki (AKLT) state, which is a non-degenerate ground state of a nearest-neighbor two-body interaction Hamiltonian. We propose an optical scheme to generate a two-dimensional AKLT state defined on the honeycomb lattice. In our proposal, three photons from different singlet states are projected onto a spin-3/2 particle comprising the AKLT state with maximum success probability 3/8. We also show the controlled-NOT gate can be implemented on this photonic AKLT state via projective measurement using linear optics and photodetection.

Keywords (OCIS):

  • (270.0270) Quantum optics : Quantum optics
  • (270.4180) Quantum optics : Multiphoton processes
  • (270.5585) Quantum optics : Quantum information and processing

Axis-selective excitation of gold nanoparticle resonances

  • Reto Giannini, Christian Hafner, and Jörg Löffler
  • received 05/27/2014; accepted 09/04/2014; posted 09/05/2014; Doc. ID 212761
  • [full text: PDF (1155) KB)]
  • Abstract: Designing the optical response of metallic nanoparticles (NPs) is crucial for applications based on localized surface plasmons. In order to gain insight into the optical properties of metallic NPs and their experimental control, a well-defined, highly flexible excitation of single NPs is needed. In this study we report on the realization of a measurement setup that allows 3D axis-selective excitation of single NPs with high accuracy, facilitating the study of the resulting scattering cross-sections in the visible wavelength range. The experimental setup combines the concepts of dark-field optical microscopy and spectroscopy (DFOMS) and objective-type total internal reflection fluorescence microscopy (TIRFM). Its functionality is validated by the study of nano-cylinders with elliptical footprints. A retardation-influenced size range of moderate aspect ratios is addressed by choosing axis lengths between 70 and 200 nm. We experimentally separate three different polarization states of dipolar character, one for an electric field along each of the three principal axes, and show that the overall scattering spectrum of such a nano-cylinder follows the expected superposition principle. Based on this separation, the scaling of the three resonances with the length of the principal axes is analyzed. It is found that each resonance scales exclusively with the corresponding principal axis in a linear way with slopes on the order of 1 to 2. Reasons for this scaling behavior and for its limited validity are discussed in terms of particle depolarization in the quasi-static limit and retardation.

Keywords (OCIS):

  • (160.3900) Materials : Metals
  • (240.6680) Optics at surfaces : Surface plasmons
  • (290.5850) Scattering : Scattering, particles
  • (250.5403) Optoelectronics : Plasmonics
  • (050.6624) Diffraction and gratings : Subwavelength structures

Three-dimensional extended nonlocal photo-polymerization driven diffusion model. Part I. Absorption

  • Haoyu Li, Yue Qi, and John Sheridan
  • received 07/24/2014; accepted 09/03/2014; posted 09/08/2014; Doc. ID 217691
  • [full text: PDF (2504) KB)]
  • Abstract: When holographic gratings being recorded in a photopolymer material layer, the spatial distributions of the photoreactions taking place lead to the formation of non-uniform gratings in depth. In an effort to study such effects, in this series of papers a three-dimensional (3-D) nonlocal photo-polymerization driven diffusion (NPDD) model is developed. In Part I, we focused on describing the photo-initiation mechanisms by introducing a 3-D dye absorption model which more accurately and physically describes the processes taking place. Then, the values of physical parameters are extracted by numerical fitting experimentally obtained normalized transmittance growth curves for a range of layer thicknesses in an acrylamide/polyvinyl alcohol (AA/PVA) photopolymer material sensitized by Erythrosine B (EB). In Part II, applying the results in Part I, the full 3-D photophysical and photochemical evolutions are modeled. Then the resulting 3-D NPDD model is validated experimentally.

Keywords (OCIS):

  • (050.7330) Diffraction and gratings : Volume gratings
  • (090.0090) Holography : Holography
  • (090.2900) Holography : Optical storage materials
  • (160.5335) Materials : Photosensitive materials
  • (010.1030) Atmospheric and oceanic optics : Absorption

Optical Multiple Bistability in Metal-Insulator-Metal Plasmonic Waveguides Side-coupled with Twin Racetrack Resonators

  • Ruei-Cheng Shiu, Yung-Chiang Lan, and Guang-Yu Guo
  • received 03/18/2014; accepted 09/03/2014; posted 09/04/2014; Doc. ID 208373
  • [full text: PDF (1605) KB)]
  • Abstract: We investigate the resonant transmissions of surface plasmons that propagate in a metal-insulator-metal (MIM) waveguide side-coupled to two MIM racetrack resonators in which optical third-order nonlinear material is filled, by the coupling mode analyses and finite-difference time-domain simulations. We find the multiple bistabilities and the hysteresis phenomena in the transmission coefficient as the input power varies. Furthermore, the mode conversion between the bistable states can be controlled by varying the input-gate power with a short switching time of about 333 fs, indicating that the MIM waveguide system may have applications in multiple switches, logic operations, and electromagnetically induced transparency.

Keywords (OCIS):

  • (190.1450) Nonlinear optics : Bistability
  • (230.7370) Optical devices : Waveguides
  • (240.6680) Optics at surfaces : Surface plasmons

(PNR2014) Direct measurement of the Wigner function by photon-number-resolving detection

  • Niranjan Sridhar, Reihaneh Shahrokhshahi, Aaron Miller, Brice Calkins, Thomas Gerrits, Adriana Lita, Sae Woo Nam, and Olivier Pfister
  • received 07/11/2014; accepted 09/03/2014; posted 09/12/2014; Doc. ID 216428
  • [full text: PDF (3740) KB)]
  • Abstract: Photon-number-revolving (PNR) detection allows the direct measurement of the Wigner quasiprobability distribution of an optical mode without the need for numerically processing an inverse Radon transform [K. Banaszek and K. Wódkiewicz, Phys. Rev. Lett. 76, 4344 (1996)]. In this work, we reproduced the seminal experiment of Banaszek et al. [Phys. Rev. A 60, 674 (1999) of quantum tomography of a pure coherent state, and of a statistical mixture thereof, and extended it to the more general case of photon fluxes with much more than one photon per detection time. This was made possible by the use of a superconducting transition-edge sensor to perform PNR detection from 0 to 5 photons at 1064 nm, at 70% system efficiency and with no dead time. We detail signal acquisition and detection efficiency and discuss prospects for applying such quantum tomography to non-Gaussian states.

Keywords (OCIS):

  • (270.0270) Quantum optics : Quantum optics
  • (270.5290) Quantum optics : Photon statistics
  • (270.5570) Quantum optics : Quantum detectors

Controlling the optical bistability via interacting double dark resonances in linear quantum dot molecules

  • Si-Cong Tian, Ren-Gang Wan, Cun-Zhu Tong, and Yong-Qiang Ning
  • received 06/25/2014; accepted 09/02/2014; posted 09/05/2014; Doc. ID 214469
  • [full text: PDF (662) KB)]
  • Abstract: The behavior of optical bistability in linear triple quantum dot molecules using double tunneling coupling by means of a unidirectional ring cavity is investigated. The linear and nonlinear susceptibilities of the system are also investigated. The double tunneling between the quantum dots can induce the interacting of double dark resonances, which can enhance the nonlinear response of the system. And the type, the hysteresis loop and the threshold of optical bistability can be controlled by the intensity of the double tunneling and the detuning of the probe field. Our results give insights for future experiments and applications in optics using quantum dot molecules.

Keywords (OCIS):

  • (190.1450) Nonlinear optics : Bistability
  • (270.0270) Quantum optics : Quantum optics

Preparation of photonic Fock state using bichromatic adiabatic passage under dissipative environment

  • Wan-Li Yang, Qizhe Hou, Mang Feng, and Changyong Chen
  • received 06/11/2014; accepted 09/02/2014; posted 09/03/2014; Doc. ID 213780
  • [full text: PDF (740) KB)]
  • Abstract: We propose a potentially practical scheme for generating the controllable photonic Fock state in a cavity by using bichromatic adiabatic passage technique in the atom-cavity-laser system under dissipative environment. By numerically simulating the quantum dynamics of the whole system, we demonstrate quantitatively that the maximal probabilities of Fock state can be achieved by elaborately adjusting the peak amplitudes of the laser's Rabi frequency and the detuning between the laser frequency and the atomic transition frequency. In addition, we have also shown that the atomic and cavity dissipation play different roles in the preparation of Fock state inside cavity. The experimental feasibility and challenge are justified using currently available technology.

Keywords (OCIS):

  • (020.5580) Atomic and molecular physics : Quantum electrodynamics
  • (020.5780) Atomic and molecular physics : Rydberg states
  • (270.5585) Quantum optics : Quantum information and processing

Non-diffracting and non-attenuating vortex light beams in media nonlinear absorption of orbital angular momentum

  • Miguel Porras and Carlos Ruiz-Jimenez
  • received 07/09/2014; accepted 09/02/2014; posted 09/03/2014; Doc. ID 216724
  • [full text: PDF (1679) KB)]
  • Abstract: We show that a high-order Bessel beam propagating in a medium with nonlinear absorption is not completely absorbed, but survives in the form of a new propagation invariant vortex beam in which the beam energy and orbital angular momentum are permanently transferred to matter and at the same time refueled by spiral inward currents of energy and angular momentum. Unlike vortex solitons and dissipative vortex solitons, these vortex beams are not supported by specific dispersive nonlinearities (self-focusing or self-defocusing) and do not require gain. Propagation invariance in presence of multiple absorption of photons carrying (possibly high) orbital angular momentum makes these beams attractive for optical pumping of angular momentum over long distances.

Keywords (OCIS):

  • (190.3270) Nonlinear optics : Kerr effect
  • (190.4180) Nonlinear optics : Multiphoton processes
  • (190.4420) Nonlinear optics : Nonlinear optics, transverse effects in
  • (190.5940) Nonlinear optics : Self-action effects
  • (050.4865) Diffraction and gratings : Optical vortices
  • (190.6135) Nonlinear optics : Spatial solitons

Superradiance as a Source of Collective Decoherence in Quantum Computers

  • D. Yavuz
  • received 07/16/2014; accepted 09/02/2014; posted 09/03/2014; Doc. ID 217201
  • [full text: PDF (350) KB)]
  • Abstract: We analyze the radiative coupling of qubits to a common radiation bath in free space and discuss that superradiance (collective emission) results in decoherence that scales with the square of the number of qubits. This decoherence mechanism is non-local; the collective emission simultaneously decoheres all the qubits in the computer. Because the noise source is not local, the introduced errors are outside the applicability of the threshold theorem. As a result, we argue that the errors due to superradiance cannot be corrected using the current models of fault-tolerant quantum computation.

Keywords (OCIS):

  • (270.2500) Quantum optics : Fluctuations, relaxations, and noise
  • (270.6630) Quantum optics : Superradiance, superfluorescence
  • (270.5585) Quantum optics : Quantum information and processing

(LIM2014) Transient optical properties of dielectric and semiconductor excited by the ultrashort laser pulse

  • E. Gamaly and A. Rode
  • received 06/03/2014; accepted 09/01/2014; posted 09/02/2014; Doc. ID 213070
  • [full text: PDF (1660) KB)]
  • Abstract: Transient permittivity of dielectrics and semiconductors excited by powerful ultra-short laser pulse is introduced here in explicit form, which shows the decreasing contribution of the valence electrons and the increasing contribution of free carries with the rising laser fluence. We describe the evolution of permittivity from the initial state up to transformation into plasma before the ablation. Two orders of magnitude change in the electron’s collision rate during this transition is taken into account explicitly. The interplay between the ionization nonlinearity and the electron collisions dominate the transient optical properties of a swiftly excited material and results in unexpected minima and maxima in the permittivity and reflectivity. Our analysis of the transient permittivity of silica and silicon at 800 and 1300 nm reveals the differences in fs-excitation of narrow and wide band gap material and also distinguishes a metal-like state of the ionized dielectric from the excited state in metals. The obtained dependence of the transient permittivity on the electron density can be directly mapped on to the fluence distribution in the time and space domains. We briefly discuss the possibility to measure these transient properties in pump-probe experiments.

Keywords (OCIS):

  • (320.7120) Ultrafast optics : Ultrafast phenomena
  • (320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors
  • (350.3390) Other areas of optics : Laser materials processing

Computational fluid dynamics modeling of subsonic flowing-gas diode pumped alkali lasers: comparison with semi-analytical model calculations and with experimental results

  • Karol Waichman, Boris Barmashenko, and Salman Rosenwaks
  • received 07/18/2014; accepted 09/01/2014; posted 09/03/2014; Doc. ID 217256
  • [full text: PDF (2143) KB)]
  • Abstract: Comprehensive analysis of kinetic and fluid dynamic processes in flowing-gas diode pumped alkali lasers (DPALs) using two- and three-dimensional computational fluid dynamics (2D and 3D CFD) models is reported. The 2D model is applied to a DPAL with optical resonator-flow field coaxial configuration and the 3D model is applied to an optical axis transverse to the flow configuration. The models take into account effects of temperature rise and losses of alkali atoms due to ionization. The 2D CFD model is applied to 1 kW flowing-gas Cs DPAL [A.V. Bogachev et al., Quantum Electron. 42, 95 (2012)] and the calculated results are in good agreement with the measurements. Comparison of the 2D CFD to semi-analytical model [B. D. Barmashenko and S. Rosenwaks, J. Opt. Soc. Am. B 30, 1118 (2013)] shows that for low pump power both models predict very close values of the laser power; however, at higher pump power, corresponding to saturation of the absorption of the pump transition, the laser power calculated using the 2D CFD model is much higher than that obtained using the semi-analytical model. At high pump power, the heat convection out of the laser resonator is more efficient for the transverse case than the coaxial case, the beam temperature is lower and consequently the calculated laser power is higher. Optimization of the Cs DPAL parameters, using 3D CFD modeling, shows that applying high flow velocity and narrowband pumping, maximum lasing power as high as 40 kW can be obtained at pump power of 80 kW for transverse flow configuration in a pumped volume of ~ 0.7 cm3.

Keywords (OCIS):

  • (140.1340) Lasers and laser optics : Atomic gas lasers
  • (140.3430) Lasers and laser optics : Laser theory
  • (140.3480) Lasers and laser optics : Lasers, diode-pumped
  • (140.6810) Lasers and laser optics : Thermal effects

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