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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 50, Iss. 6 — Jun. 1, 1996
  • pp: 790–794

Mid-Infrared Sources Using Dye Lasers in KTiOAsO4 and LiIO3

A. H. Kung, Suli Fei, and H. L. Strauss

Applied Spectroscopy, Vol. 50, Issue 6, pp. 790-794 (1996)


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Abstract

A coherent infrared source tunable from 3.4 to 5.3 μm has been constructed by difference-frequency mixing of the second harmonic of a Q-switched Nd:YAG laser and a pulsed dye laser using the new crystal KTiOAsO4 (KTA). A peak power of >50 kW and pulse energy of >250 μJ are measured at 4.4 μm. The results are compared with mixing in LiIO3. For a low-power Nd:YAG laser that produces 200 mJ of 532-nm radiation, the infrared power is similar for the two crystals. For high-power YAG lasers, calculation shows that commercial KTA crystals can produce over 10 mJ of IR power in the absence of absorption loss. The laser damage threshold of KTA at 532 nm is determined to be 300 ± 30 MW/cm2. Both the maximum IR power and the damage threshold are several times higher for KTA than for LiIO3. A simple frequency calibration method is described.

Citation
A. H. Kung, Suli Fei, and H. L. Strauss, "Mid-Infrared Sources Using Dye Lasers in KTiOAsO4 and LiIO3," Appl. Spectrosc. 50, 790-794 (1996)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-50-6-790

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