Compact green laser source using butt-coupling between multi-section DFB-laser and SHG waveguide crystal

A green laser source was assembled consisting of a multi-section distributed feedback laser and a periodically poled lithium niobate crystal in single-pass configuration. Butt-coupling between the tilted output facet of the laser and the second harmonic generation waveguide crystal was applied allowing the assembly of the green emitter being without further optical elements. An output power of 35 mW and a single frequency operation with an SMSR of 50 dB were achieved for the green emitter developed.