Fabrication of a 2D thermally tunable grating light valve for fabricating CO2 laser beam analyzer

摘要

The grooves of a 2D grating is filled with a temperature dependent refractive index liquid. Irradiating a CO2 laser on the grating produce a thermal distribution the same as it's beam profile and cause the same distribution for 1st order diffraction efficiency. This distribution is imaged by visible light on a CCD camera in a 4f imaging system.