Second Harmonic Generation of Short Pulse, High Peak-Power, Line-Narrowed TEA CO2 Laser Using a AgGaSe2 Crystal

Akiko HARASAKI; Masakatsu SUGII; Yutaka UCHIDA; Shinji OHKUMA; Jun SAKUMA; Saburoh TANAKA; Shinsuke UMEGAKI

doi:10.2184/lsj.23.280

Second Harmonic Generation of Short Pulse, High Peak-Power, Line-Narrowed TEA CO₂ Laser Using a AgGaSe₂ Crystal

Akiko HARASAKI, Masakatsu SUGII, Yutaka UCHIDA, Shinji OHKUMA, Jun SAKUMA, Saburoh TANAKA, Shinsuke UMEGAKI

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Keywords: Second harmonic generation, TEA CO₂ laser, AgGaSe₂ crystal

JOURNAL FREE ACCESS

1995 Volume 23 Issue 4 Pages 280-287

DOI https://doi.org/10.2184/lsj.23.280

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Abstract

Second-harmonic generation (SHG) of short pulse, high peak-power, line-narrowed TEA CO₂ laser radiation has been demonstrated for the typical vibrational-rotational transition lines of 10P, 10R, 9P and 9R branches in a 15-mm long AgGaSe₂ crystal with broad band AR coatings. A high energy conversion efficiency of 38% with the SHG output energy of 7.4mJ (274 kW peak power) was achieved in triple-pass at a moderate pumping intensity of 5.7 MW/cm². Multi-pass pumping scheme is a very powerful technique to enhance conversion efficiency.

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