15 February 2018 CW 3μm lasing via two-photon pumping in cesium vapor with a 1W source
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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 P1/2 to 72 S1/2 line are observed from degenerate two-photon pumping of the cesium 72 S1/2 to 62 D3/2 transition. 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.
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Nathan D. Haluska, Christopher A. Rice, 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); doi: 10.1117/12.2290407; https://doi.org/10.1117/12.2290407
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