Third harmonic generation of CO2 laser radiation in AgGaSe2 crystal |
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| Authors: | Gopal C Bhar Pathik Kumbhakar D V Satyanarayana N S N Banerjee U Nundy C G Chao |
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| Affiliation: | (1) Laser Laboratory, Physics Department, Burdwan University, 713 104 Burdwan, India;(2) Present address: Physics Department, Regional Engineering College, 713 209 Durgapur, India;(3) Centre for Advanced Technology, 452 013 Indore, India;(4) Anhui Institute of Optics and Fine Mechanics, China |
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| Abstract: | Generation of third harmonic of CO2 laser radiation has been obtained in a type-II, ϑ=57° cut 9 mm thick AgGaSe2 crystal for the first time by sum-frequency-mixing of the fundamental with its second harmonic, the latter being obtained using another type-I, ϑ=55° cut 11 mm thick AgGaSe2 crystal. The energy conversion efficiencies obtained for second harmonic and third harmonic generations are 6.3% and 2.4% respectively with the input fundamental pump power density of 5.9 MW/cm2 only. The wavelength of the fundamental CO2 laser radiation used for the generation of harmonics is 10.6 μm, P(20) line. A compact TEA CO2 laser source has been built in the laboratory. |
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| Keywords: | Nonlinear optical material third harmonic generation AgGaSe2 crystal |
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