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Efficient 1.8 μm KTiOPO 4 optical parametric oscillator pumped within an Nd : YAG / SrWO 4 Raman laser

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Abstract

A 1.8μm optical parametric oscillator (OPO) based on a noncritically phase-matched KTiOPO4 crystal is demonstrated. OPO and stimulated Raman scattering techniques are successfully combined in an acousto-optically Q-switched Nd:YAG/SrWO4 Raman laser. The device efficiently realizes three steps of conversion: from a laser diode wavelength of 808nm to the fundamental wavelength of 1064nm; next, to the Stokes wavelength of 1180nm; and finally to the OPO signal wavelength of 1810nm. With an incident diode power of 7.2W and a pulse repetition rate of 15kHz, an average signal power of 485mW is obtained with a diode-to-signal conversion efficiency of 6.75%. The beam quality factors (M2) of the signal wave in both horizontal and vertical directions are measured to be 1.7±0.2. The numerical output power results of the system, the thermal lensing, and the stability parameter of the cavity are also discussed.

© 2011 Optical Society of America

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