Green light source by single-pass second harmonic generation withlaser and crystal in a tilted butt joint setup

摘要

In this work a compact green laser light source is presented based on a single-pass second harmonic generation (SHG) innon-linear material. The green light source consists of a distributed feedback (DFB) laser with a monolithicallyintegrated power amplifier (PA) and a periodically poled lithium niobate (PPLN) crystal with a ridge waveguide. Toachieve the smallest size and to reduce the number of parts to be assembled, a direct coupling approach is implementedwithout using any lens. The waveguide of the laser is bent and the facet of the crystal is tilted and AR-coated in order toreduce undesired reflections and to increase the stability of operation. By varying the injection current of the amplifierthe infrared output power of the laser changes proportionally. The wavelength remains stable during current variationand in that way the green optical output power can also be modulated. No additional external modulator is required forthe generation of distinct green light levels. At a wavelength of 530 nm, a green optical output power of more than35 mW is achieved for injection currents of 93 mA and 400 mA through the DFB section and amplifier sectionrespectively.