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Proceedings Paper

CW 3µm lasing via two-photon pumping in cesium vapor with a 1W source
Author(s): Nathan D. Haluska; Christopher A. Rice; Glen P. Perram
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Paper 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.

Paper Details

Date Published: 15 February 2018
PDF: 8 pages
Proc. SPIE 10511, Solid State Lasers XXVII: Technology and Devices, 105112M (15 February 2018); doi: 10.1117/12.2290407
Show Author Affiliations
Nathan D. Haluska, Air Force Institute of Technology (United States)
Christopher A. Rice, Air Force Institute of Technology (United States)
Glen P. Perram, Air Force Institute of Technology (United States)


Published in SPIE Proceedings Vol. 10511:
Solid State Lasers XXVII: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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