Click here to view fulltext PDF

Permanent link:
https://www.ias.ac.in/article/fulltext/pram/055/03/0405-0412

Nonlinear optical material; third harmonic generation; AgGaSe₂ crystal

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.

Gopal C Bhar¹ Pathik Kumbhakar^{1 2} D V Satyanarayana³ N S N Banerjee³ U Nundy³ C G Chao⁴

1. Laser Laboratory, Physics Department, Burdwan University, Burdwan - 713 104, India
2. Physics Department, Regional Engineering College, Durgapur - 713 209, India
3. Centre for Advanced Technology, Indore - 452 013, India
4. Anhui Institute of Optics and Fine Mechanics, China

Published

September 2000

Manuscript received

10 February 2000

Manuscript revised

29 June 2000