Wavelength matching and tuning in green laser packaging using second harmonic generation

Short wavelength laser sources, such as green laser sources, have found increased applications. Laser wavelengths, such as green light, which cannot be generated by a single native semiconductor laser source, can be obtained using the nonlinear susceptibility of many optical materials. For green laser sources capable of high speed modulation, the combination of a quasi-phase-matched second harmonic generation (SHG) waveguide device and a single-wavelength distributed-Bragg-reflector (DBR) laser diode is promising. The wavelength conversion efficiency of a SHG is strongly dependent on the wavelength matching between the DBR laser diode and the SHG device, posing a significant challenge in green laser packaging. It is desired that the wavelength matching is achieved at high efficiency and thus low power consumption. In this paper, the wavelength matching between a DBR laser diode and a SHG device is discussed and thermal wavelength tuning of both laser and SHG device is designed and studied.