23 March 2005 Optimum reflectivity of output coupler for ultraviolet singly resonant oscillator with high efficiency based on LiB3O5
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Abstract
Pulsed optical parametric oscillators (OPO) are powerful sources of broadly tunable coherent radiation that covers the wide spectral range from the near ultraviolet (UV) to the infrared. Here, we investigate an optimum reflectivity of the output coupler for the signal wave in order to achieve the efficient ultraviolet LiB3O5 (LBO) optical parametric oscillator pumped by the fourth harmonics of a Q-switched Nd:YAG laser with 25-ns pulse duration and repetition rate of 10 Hz. Our LBO crystal of a rectangular shape has an aperture of 6 x 6 mm2 with an interaction length of 10 mm, and it is cut for the non-critical phase matching of the type-II. The simple singly-resonant oscillator (SRO) configuration with two flat mirrors, M1 and M2, is used. The LBO crystal is mounted in the resonator in such a way that the wavelength of the signal wave is fixed at 313.5 nm. The input coupler M1 with high transmittance for the pump wave (T > 95%) is highly reflective (R > 99%) for the signal wave. In order to study the characteristics of signal output energy under the various conditions of output coupler M2, three kinds of M2 with different reflectivities for the signal wave are used. It is found that the maximum conversion efficiency as high as ~20% is achieved by using the dichroic output coupler of reflectivities for the signal wave of 65% and pump wave of 99%, respectively. This value is the highest efficiency in UV SRO among those ever reported to our knowledge.
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Ki-Ho Cho and Bum Ku Rhee "Optimum reflectivity of output coupler for ultraviolet singly resonant oscillator with high efficiency based on LiB3O5", Proc. SPIE 5710, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IV, (23 March 2005); doi: 10.1117/12.587475; https://doi.org/10.1117/12.587475
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