Abstract

A high efficiency, low threshold, high repetition rate H-β Fraunhofer line light at 486.1 nm was demonstrated. A high-efficiency KTP optical parametric oscillator was achieved by double-pass pumping with a high-maturity 5 kHz 532 nm laser. Thanks to the efficient intracavity frequency doubling of the circulating signal wave by a BIBO crystal, the threshold pump power of the 486.1 nm output was 0.9 W, and the maximum output power of 1.6 W was achieved under the pump power of 7.5 W. The optical–optical conversion efficiency was 21.3%, with the pulse duration of 45.2 ns, linewidth of ∼0.12 nm, and beam quality factor M² of 2.83.

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