Eye-safe radiation source based on an optical parametric oscillator |
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Authors: | A I Vodchits V I Dashkevich N S Kazak V K Pavlenko V I Pokryshkin I P Petrovich V V Rukhovets A S Kraskovskii V A Orlovich |
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Institution: | (1) B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 prosp. Nezavisimosti, Minsk, 220072;(2) Peleng OAO, Minsk, Belarus |
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Abstract: | We have studied an optical parametric oscillator (OPO) with an unstable telescopic cavity, placed inside the cavity of an
actively Q-switched multimode Nd3+:KGW pump laser. We used a KTP crystal as the nonlinear medium for the OPO. We have compared the emission characteristics
of OPOs with unstable telescopic and planar cavities. We have established that compared with the planar cavity, the unstable
cavity reduces the OPO beam divergence and improves the spatial distribution of the radiation energy in the far wave zone.
Based on our investigations, we have designed a compact eye-safe (λ = 1.578 μm) laser source with natural cooling, emitting
(for electrical pumping energy 7.3 J) pulses with pulse energy 22 mJ and pulse duration 6 nsec. The FWHM beam divergence for
the source is no greater than 3.5 mrad.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 2, pp. 254–259, March–April, 2006. |
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Keywords: | eye-safe radiation intracavity optical parametric oscillator unstable telescopic cavity KTP crystal Nd:KGW pump laser |
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