Wavelength tuning for diffractive optical elements of structured light projectors

A method comprising:

• capturing, in accordance with tuning instructions, images of one or more structured light patterns projected by a structured light projector in accordance with the tuning instructions, the structured light projector comprising a laser light source, a wavelength regulator that regulates temperature of the laser light source, and a diffractive optical element (DOE) that generates structured light patterns using light from the laser light source, and the captured images include images of structured light patterns captured at different temperature values of the light laser source;
• generating the tuning instructions that cause the wavelength regulator to set the laser light source to different temperatures of a set of temperatures, and the camera to capture images of the structured light pattern generated by the structured light projector at each of the different temperatures;
• and
• determining a temperature calibrated to the DOE using one or more of the captured images, wherein the temperature calibrated to the DOE corresponds to a wavelength of light emitted by the laser light source that results in an estimated minimum power of a zeroth order diffracted beam of the structured light pattern.

A wavelength tuning system comprising:

• a camera configured to capture, in accordance with tuning instructions, images of one or more structured light patterns projected by a structured light projector in accordance with the tuning instructions, the structured light projector comprising a laser light source, a wavelength regulator that regulates temperature of the laser light source, and a diffractive optical element (DOE) that generates structured light patterns using light from the laser light source, and the captured images include images of structured light patterns captured at different temperature values of the light laser source;
• and
• a controller configured to:
• generate the tuning instructions that cause the wavelength regulator to set the laser light source to different temperatures of a set of temperatures, and the camera to capture images of the structured light pattern generated by the structured light projector at each of the different temperatures,
• determine a temperature calibrated to the DOE using one or more of the captured images, wherein the temperature calibrated to the DOE corresponds to a wavelength of light emitted by the laser light source that results in at least one performance metric meeting a corresponding threshold value.