Abstract

We use optogalvanic method to measure the ionization degree in the hydrocarbon-free rubidium DPAL gain medium. The results show that the ionization degree increases as pump intensity and helium pressure increase, and presents rollover as rubidium concentration increases. A maximal ionization degree of $\sim 6.45\times {10}^{-6}$ has been obtained with pump intensity of $0.82\mathrm{kW}/{\mathrm{cm}}^2$, temperature of 150°C and helium pressure of 500 Torr. Theoretical estimation shows that energy pooling is the main process rather than photoexcitation for the subsequent ionization processes.

© 2014 Optical Society of America

Ionization degree measurement in the gain medium of a hydrocarbon-free rubidium vapor laser operating in pulsed and CW modes

Xiaofan Zhao, Zining Yang, Weihong Hua, Hongyan Wang, and Xiaojun Xu
Opt. Express 25(8) 9458-9470 (2017)

Study on photoionization in a rubidium diode-pumped alkali laser gain medium with the optogalvanic method

Lun Ge, Weihong Hua, Hongyan Wang, Zining Yang, and Xiaojun Xu
Opt. Lett. 38(2) 199-201 (2013)

Methane-based in situ temperature rise measurement in a diode-pumped rubidium laser

Rui Wang, Zining Yang, Hongyan Wang, and Xiaojun Xu
Opt. Lett. 42(4) 667-670 (2017)

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 D. Barmashenko, and Salman Rosenwaks
J. Opt. Soc. Am. B 31(11) 2628-2637 (2014)

Real-time measurement of temperature rise in a pulsed diode pumped rubidium vapor laser by potassium tracing atom based absorption spectroscopy

Xiaofan Zhao, Zining Yang, Weihong Hua, Hongyan Wang, and Xiaojun Xu
Opt. Express 25(6) 5841-5851 (2017)