Light detection and ranging (LiDAR) system using a wavelength converter

An apparatus for emitting laser light, comprising:

• a first laser source configured to provide a first laser beam having a first wavelength equal to or above 1,100 nm;
• a second laser source configured to provide a second laser beam having a second wavelength different than the first wavelength;
• and
• a wavelength converter configured to convert the first laser beam and the second laser beam into a converted laser beam having a third wavelength below 1,100 nm, wherein the wavelength converter comprises:
• a nonlinear optical material configured to perform optical frequency mixing of the first laser beam and the second laser beam, and
• a temperature controller configured to set a temperature of the nonlinear optical material based on the third wavelength of the converted laser beam,
• wherein the first laser source and the second laser source are separate.

An optical sensing method, comprising:

• emitting, by a first laser source, a first laser beam having a first wavelength equal to or above 1,100 nm;
• emitting, by a second laser source, a second laser beam having a second wavelength different than the first wavelength;
• and
• converting, by a wavelength converter, the first laser beam and the second laser beam into a converted laser beam having a third wavelength below 1,100 nm, wherein the converting the first laser beam and the second laser beam into the converted laser beam comprises:
• setting, by a temperature controller, a temperature of a nonlinear optical material based on the third wavelength of the converted laser beam, and
• performing, by the nonlinear optical material, optical frequency mixing of the first laser beam and the second laser beam,
• wherein the first laser source and the second laser source are separate.