Light conversion module and light source system including the same

A light source system, comprising:

• a first laser source producing a first light beam with a first near-infrared wavelength;
• a second laser source producing a second light beam with a second near-infrared wavelength;
• and
• a light conversion module comprising:
• a coupler combining the first and second light beams to form a combined light beam;
• a nonlinear crystal arranged to receive the combined light beam, configured to include a plurality of poling regions for performing successive nonlinear frequency mixing processes to provide a light beam including red, green, and blue wavelengths;
• a first optical device configured to focus the combined light beam onto the nonlinear crystal;
• a first moving stage carrying the nonlinear crystal and configured for moving the nonlinear crystal for an adjustment of a focus position of the combined light beam on the nonlinear crystal;
• an optical detector configured for measuring a power level of a light beam from the nonlinear crystal for the adjustment of the focus position of the combined light beam on the nonlinear crystal;
• a splitting mirror for directing a portion of the light beam from the nonlinear crystal to the optical detector;
• a second optical device for focusing the light beam from the nonlinear crystal and a second moving stage carrying the second optical device for adjusting a focus point of the second optical device;
• a heating element heating the nonlinear crystal;
• a temperature sensor adjacent to the nonlinear crystal for controlling the temperature of the nonlinear crystal;
• and
• a position sensor for sensing a position of the first moving stage;
• wherein the nonlinear crystal comprises a first poling region for a sum frequency generation process, a second poling region for a second harmonic generation process, and a third poling region for a sum frequency generation process, wherein the first, second, and third poling regions are arranged in a cascading manner.