Abstract
A novel double-pass pumping optical parametric oscillator (OPO) with unstable resonator based on Gaussian reflectivity mirror (GRM) was proposed and demonstrated. The output characteristics of double-pass pumping OPO based on non-critical phase matching (NCPM) KTiOAsO4 (KTA) crystal were researched at a pulse repetition frequency of 100 Hz. Compared with the single-pass pumping OPO, the output energy and the conversion efficiency of double-pass pumping OPO were improved by 36 %. The beam qualities of signal and idler were measured and compared with different pump structures, and the results show that beam quality of signal for double-pass pumping OPO barely deteriorated. In addition, the pulse widths of signal and idler under two pumping structures and their variation trends with different pump energies were researched and compared.
Published Version
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