CW 3µm lasing via two-photon pumping in cesium vapor with a 1W source

Nathan D. Haluska; Christopher A. Rice; Glen P. Perram

doi:10.1117/12.2290407

15 February 2018 CW 3μm lasing via two-photon pumping in cesium vapor with a 1W source

Nathan D. Haluska, Christopher A. Rice, Glen P. Perram

Author Affiliations +

Proceedings Volume 10511, Solid State Lasers XXVII: Technology and Devices; 105112M (2018) https://doi.org/10.1117/12.2290407
Event: SPIE LASE, 2018, San Francisco, California, United States

Abstract

We report the first CW lasing from two-photon pumping via a virtual state. Pulsed and the CW lasing of the 3096 nm 7² P_1/2 to 7² S_1/2 line are observed from degenerate two-photon pumping of the cesium 7² S_1/2 to 6² D_3/2transition. High intensity pulses excite over 17 lasing wavelengths. Under lower intensity CW excitation, 3 μm lasing is still observed with efficiencies of 0.7%. CW experiments utilized a Cs heat pipe at 150 °C to 270 °C, and a highly-focused, single pass, Ti-Sapphire pump with no aid of a cavity. Unlike normal DPALS, this architecture does not require buffer gas, and heat is released optically so a flowing system is not required. Both suggest a very simple device with excellent beam quality is possible. This proof of concept can be greatly enhanced with more optimal conditions such as non-degenerate pumping to further increase the two-photon pump cross section and the addition of a cavity to improve mode volume overlap. These improvements may lead to an increase in efficiencies to a theoretical maximum of 14%. Results suggest two-photon pumping with diodes is feasible.

Citation Download Citation

Nathan D. Haluska, Christopher A. Rice, and Glen P. Perram "CW 3μm lasing via two-photon pumping in cesium vapor with a 1W source", Proc. SPIE 10511, Solid State Lasers XXVII: Technology and Devices, 105112M (15 February 2018); https://doi.org/10.1117/12.2290407

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