Modeling of hydrocarbon-free potassium flowing-gas diode-pumped amplifier

Karol Waichman; Boris D. Barmashenko; Salman Rosenwaks

doi:10.1016/j.optcom.2023.130165

Modeling of hydrocarbon-free potassium flowing-gas diode-pumped amplifier

Karol Waichman, Boris D. Barmashenko, Salman Rosenwaks

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

А 3D CFD model coupled with wave optics model for laser beam propagation is used to calculate the performance of a hydrocarbon-free K end pumped flowing-gas diode pumped alkali amplifier (DPAA). The K DPAA efficiency and output beam quality were calculated as a function of various parameters and the results were compared with those calculated for end pumped Rb DPAA with hydrocarbon-free buffer gas. For moderate pump intensity, both the efficiency and beam quality deteriorate at low gas velocity. The efficiency strongly depends on the pressure of the buffer helium, reaching a maximum at pressure close to atmospheric and falling with a further increase in pressure. The maximum efficiency of the K DPAA (∼0.45) is approximately 4 times higher than that of the Rb one, achieved at the same optimal pump power of 5 kW. Addition of CH₄ to the He buffer in the K DPAA decreases the amplifier efficiency and reduces the beam quality.

Original language	English
Article number	130165
Journal	Optics Communications
Volume	554
DOIs	https://doi.org/10.1016/j.optcom.2023.130165
State	Published - 1 Mar 2024

Keywords

Alkali laser
Amplifier
Beam quality
DPALs
Gas flow

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

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10.1016/j.optcom.2023.130165

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title = "Modeling of hydrocarbon-free potassium flowing-gas diode-pumped amplifier",

abstract = "А 3D CFD model coupled with wave optics model for laser beam propagation is used to calculate the performance of a hydrocarbon-free K end pumped flowing-gas diode pumped alkali amplifier (DPAA). The K DPAA efficiency and output beam quality were calculated as a function of various parameters and the results were compared with those calculated for end pumped Rb DPAA with hydrocarbon-free buffer gas. For moderate pump intensity, both the efficiency and beam quality deteriorate at low gas velocity. The efficiency strongly depends on the pressure of the buffer helium, reaching a maximum at pressure close to atmospheric and falling with a further increase in pressure. The maximum efficiency of the K DPAA (∼0.45) is approximately 4 times higher than that of the Rb one, achieved at the same optimal pump power of 5 kW. Addition of CH4 to the He buffer in the K DPAA decreases the amplifier efficiency and reduces the beam quality.",

keywords = "Alkali laser, Amplifier, Beam quality, DPALs, Gas flow",

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AU - Waichman, Karol

AU - Barmashenko, Boris D.

AU - Rosenwaks, Salman

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Y1 - 2024/3/1

N2 - А 3D CFD model coupled with wave optics model for laser beam propagation is used to calculate the performance of a hydrocarbon-free K end pumped flowing-gas diode pumped alkali amplifier (DPAA). The K DPAA efficiency and output beam quality were calculated as a function of various parameters and the results were compared with those calculated for end pumped Rb DPAA with hydrocarbon-free buffer gas. For moderate pump intensity, both the efficiency and beam quality deteriorate at low gas velocity. The efficiency strongly depends on the pressure of the buffer helium, reaching a maximum at pressure close to atmospheric and falling with a further increase in pressure. The maximum efficiency of the K DPAA (∼0.45) is approximately 4 times higher than that of the Rb one, achieved at the same optimal pump power of 5 kW. Addition of CH4 to the He buffer in the K DPAA decreases the amplifier efficiency and reduces the beam quality.

AB - А 3D CFD model coupled with wave optics model for laser beam propagation is used to calculate the performance of a hydrocarbon-free K end pumped flowing-gas diode pumped alkali amplifier (DPAA). The K DPAA efficiency and output beam quality were calculated as a function of various parameters and the results were compared with those calculated for end pumped Rb DPAA with hydrocarbon-free buffer gas. For moderate pump intensity, both the efficiency and beam quality deteriorate at low gas velocity. The efficiency strongly depends on the pressure of the buffer helium, reaching a maximum at pressure close to atmospheric and falling with a further increase in pressure. The maximum efficiency of the K DPAA (∼0.45) is approximately 4 times higher than that of the Rb one, achieved at the same optimal pump power of 5 kW. Addition of CH4 to the He buffer in the K DPAA decreases the amplifier efficiency and reduces the beam quality.

KW - Alkali laser

KW - Amplifier

KW - Beam quality

KW - DPALs

KW - Gas flow

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VL - 554

JO - Optics Communications

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Modeling of hydrocarbon-free potassium flowing-gas diode-pumped amplifier

Abstract

Keywords

ASJC Scopus subject areas

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