title: Large aperture PPMgLN based high-power optical parametric oscillator at 3.8 µm pumped by a nanosecond linearly polarized fiber MOPA.
abstract: We report a large aperture PPMgLN based OPO generating 21W of average output power at a slope efficiency of 45%. The OPO is pumped with the output from a polarization maintaining Ytterbium doped fiber MOPA operating at 1060nm producing 20ns pulses at a repetition rate of 100kHz and an average output power of 58W (after the isolators). A maximum of 5.5W of optical power was recorded at the idler wavelength of 3.82µm without thermal roll-off. The pulse rise/fall time plays a significant role in the OPO conversion efficiency and that further enhancements in the efficiency should be possible using pulses with faster rise and fall times.
authors: Optoelectronic Research Centre, University of Southampton, Southampton SO17 1BJ, UK.
authors: Dejiao
authors: D
authors: Lin
authors: Shaif-ul
authors: SU
authors: Alam
authors: Yonghang
authors: Y
authors: Shen
authors: Tao
authors: T
authors: Chen
authors: Bo
authors: B
authors: Wu
authors: David J
authors: DJ
authors: Richardson