High-power (1.1W) green (532nm) laser source based on single-pass second harmonic generation on a compact micro-optical bench
Proc. SPIE, vol. 7917, no. 791704 (2011).
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We demonstrate a compact high-power green (532nm) laser module based on single-pass second harmonic generation. The pump source is a distributed Bragg reflector tapered diode laser. The frequency conversion is achieved with a 2.5 cm long periodically poled MgO:LiNbO3 bulk crystal. The entire module is integrated on a compact micro-optical bench with a footprint of 2.5 cm3. Up to 1.1 W output green light power is achieved at a pump power of 7.6 W with an optical conversion efficiency of about 15% and a corresponding module wall-plug efficiency of more than 4%. The green laser beam has a relatively good beam quality (measured at output power level of ~0.9 W) with M2σ=1.8 in the vertical direction and M2σ=4.9 in the lateral direction, respectively. The long-term output power stability is ±10% (tested at output power level of ~0.6 W).
1 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Strasse 4, 12489 Berlin, Germany
2 Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
Second harmonic generation, DBR tapered laser, PPLN, micro-optical bench.