A compact optically pumped vertical-external-cavity surface-emitting-semiconductor laser (OP-VECSEL) at 1178 nm for μs pulsed operation is reported for the first time. The laser employed a V-shaped resonator with the cavity length of 300 mm, pumped by a 200 μs pulse 808 nm laser operating at a repetition rate of 1 kHz. The maximum output power about 0.78W was obtained at pump power of ~5.9 W. The corresponding conversion efficiency from absorbed pump power to 1178 nm was 13.2%. Further, by the intra-cavity frequency doubling of the VECSEL, a μs pulsed 589 nm laser has broad prospects in the application of sodium guide stars.
We demonstrate a compact narrow linewidth high beam quality diode pumped solid-state microsecond (μs) pulse yellow laser at 589 nm by intra-cavity sum-frequency generation (SFG). The resonators are based on a symmetrical co-folding-arm plane-plane structure with a two-rod configuration for birefringence compensation, working in a thermally near-unstable range of the cavity. A twisted-mode cavity for spatial hole-burning elimination and an etalon in 1319 and 1064 nm resonators are employed to realize the narrow linewidth laser output. Moreover, in order to improve the SFG efficiency, the laser spiking due to relaxation oscillations is suppressed by inserting frequency doublers in both 1319 and 1064 nm oscillators. By carefully designing the cavity, a 4.8 W quasi-continuous wave yellow laser source at 589 nm is generated with a beam quality factor of M2 = 1.63 and a linewidth of ~ 0.44 pm. The 589 nm laser is operated at a repetition rate of 500 Hz with pulse duration of ~ 115 μs.
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