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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 5 — May. 1, 2013
  • pp: 1118–1126

Detailed analysis of kinetic and fluid dynamic processes in diode-pumped alkali lasers

Boris D. Barmashenko and Salman Rosenwaks  »View Author Affiliations


JOSA B, Vol. 30, Issue 5, pp. 1118-1126 (2013)
http://dx.doi.org/10.1364/JOSAB.30.001118


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Abstract

Kinetic and fluid dynamic processes in diode-pumped alkali lasers (DPALs) are analyzed in detail using a simple, semi-analytical model, applicable to both static and flowing-gas devices. Unlike other models, it takes into account the effects of temperature rise, excitation of neutral alkali atoms to high lying electronic states and their losses due to ionization and chemical reactions, resulting in a decrease in pump absorption, slope efficiency, and lasing power. Effects of natural convection in static DPALs are also taken into account. The applicability of the model is demonstrated in Cs DPALs by (1) obtaining good agreement with measurements in static [Electron. Lett. 44, 582 (2008)] and flowing-gas [Quantum Electron. 42, 95 (2012)] DPALs, (2) predicting the dependence of power on the flow velocity in flowing-gas DPALs, and (3) checking the effect of using a buffer gas with high molar heat capacity and a large relaxation rate constant between the P 3 / 2 2 and P 1 / 2 2 fine-structure levels of the alkali atom. The power strongly increases with flow velocity and by replacing, e.g., ethane by propane as a buffer gas, the power may be further increased by up to 30%; 7 kW is achievable in a small-scale laser with 10 cm 3 of propane for a 20 kW pump at a flow velocity of 20 m/s..

© 2013 Optical Society of America

OCIS Codes
(140.1340) Lasers and laser optics : Atomic gas lasers
(140.3430) Lasers and laser optics : Laser theory
(140.3460) Lasers and laser optics : Lasers
(140.6810) Lasers and laser optics : Thermal effects

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: January 7, 2013
Manuscript Accepted: February 28, 2013
Published: April 4, 2013

Citation
Boris D. Barmashenko and Salman Rosenwaks, "Detailed analysis of kinetic and fluid dynamic processes in diode-pumped alkali lasers," J. Opt. Soc. Am. B 30, 1118-1126 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-5-1118

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