Influence of the helium-pressure on diode-pumped alkali-vapor laser

Fei Gao; Fei Chen; Ji-jiang Xie; Lai-ming Zhang; Dian-jun Li; Gui-long Yang; Jing Guo

doi:10.1117/12.2010455

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16 May 2013 Influence of the helium-pressure on diode-pumped alkali-vapor laser

Fei Gao, Fei Chen, Ji-jiang Xie, Lai-ming Zhang, Dian-jun Li, Gui-long Yang, Jing Guo

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Proceedings Volume 8796, 2nd International Symposium on Laser Interaction with Matter (LIMIS 2012); 87961O (2013) https://doi.org/10.1117/12.2010455
Event: 2nd International Symposium on Laser Interaction with Matter (LIMIS 2012), 2012, Xi'an, Shaanxi, China

Abstract

Diode-pumped alkali-vapor laser (DPAL) is a kind of laser attracted much attention for its merits, such as high quantum efficiency, excellent beam quality, favorable thermal management, and potential scalability to high power and so on. Based on the rate-equation theory of end-pumped DPAL, the performances of DPAL using Cs-vapor collisionally broadened by helium are simulated and studied. With the increase of helium pressure, the numerical results show that: 1) the absorption line-width increases and the stimulated absorption cross-section decreases contrarily; 2) the threshold pumping power decreases to minimum and then rolls over to increase linearly; 3) the absorption efficiency rises to maximum initially due to enough large stimulated absorption cross-section in the far wings of collisionally broadened D2 transition (absorption transition), and then begins to reduce; 4) an optimal value of helium pressure exists to obtain the highest output power, leading to an optimal optical-optical efficiency. Furthermore, to generate the self-oscillation of laser, a critical value of helium pressure occurs when small-signal gain equals to the threshold gain.

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Fei Gao, Fei Chen, Ji-jiang Xie, Lai-ming Zhang, Dian-jun Li, Gui-long Yang, and Jing Guo "Influence of the helium-pressure on diode-pumped alkali-vapor laser", Proc. SPIE 8796, 2nd International Symposium on Laser Interaction with Matter (LIMIS 2012), 87961O (16 May 2013); https://doi.org/10.1117/12.2010455

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