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Non-linear optics; ultraviolet radiation; tangential phase-matching; Sellmeier dispersion

Tangential phase-matching has been realised in cesium lithium borate (CLBO) crystal for the first time for the generation of fourth harmonic (266 nm) of Nd:YAG and third harmonic (226.7 nm) of a dye laser radiation by second harmonic generation and sum-frequency mixing with the angular tolerance as large as 22 mrad and 21 mrad respectively, over one of the interacting beams. An energy conversion efficiency of 15% for fourth harmonic generation is obtained with a 5.5 mm thick crystal and with the average pump powers only 170 and 70 mW. A set of Sellmeier dispersion equations for the CLBO crystal have also been formulated.

Gopal C Bhar¹ Pathik Kumbhakar^{1 2} Anil K Chaudhary¹

1. Laser Laboratory, Physics Department, Burdwan University, Burdwan - 713 104, India
2. Regional Engineering College, Durgapur, Burdwan - 713 209, India

Published

September 2000

Manuscript received

8 March 2000

Manuscript revised

29 June 2000