Abstract
The near-infrared region is of importance in areas such as photochemistry, optical communications, and optical pumping; yet it remains relatively uncovered by strong coherent sources of radiation. The CO2 laser is an efficient and tunable source of mid-IR radiation, and as a result frequency conversion of CO2 lasers in nonlinear materials is an attractive method for generating new IR sources. Thallium arsenic selenide (TI3AsSe3) (TAS) is a biréfringent ternary chalcogenide salt with many properties that are useful for CO2 harmonic generation. It is a member of the space group R3m, possesses a large nonlinear coefficient (deff = 40 X 10−12 m/V), has a fairly high damage threshold (1.7 J/cm2), and is transparent and phase-matchable throughout the IR. Under type I phase matching, high second harmonic conversion efficiencies of CO2 laser radiation have been measured in the present study, and conversion of the CO2 fundamental into its third, fourth, and fifth harmonic has been achieved for the first time.
© 1988 Optical Society of America
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