WAVELENGTH CONVERSION MODULE

摘要

A wavelength conversion module comprises an external resonator, a semiconductor laser module, and a wavelength conversion device for converting the wavelength of the light emitted from the semiconductor laser module into a wavelength shorter than the former wavelength. This wavelength conversion device can be at least either a nonlinear crystal for generating a sum frequency (SFG) or a nonlinear crystal for generating a second harmonic (SHG). In the sum frequency (SFG) generating element and second harmonic (SHG) generating element of the wavelength conversion device, the periodical polarization may be inverted by a ridge optical waveguide structure or by a proton-exchange optical waveguide structure.