Abstract

We propose a thermally actuated tunable grating for measuring the beam profile of a ${\text{CO}}_2$ laser. The grooves of a transmissive grating are filled with a liquid whose refractive index depends on temperature. A visible laser as a probe and a ${\text{CO}}_2$ laser as a heat source are illuminated on the grating. The ${\text{CO}}_2$ laser is absorbed, and depending on its beam profile, a temperature profile is induced on the grating. The refractive index of the heated liquid is changed, resulting in a change of efficiency of the grating for the probe laser. By using the 1st orders of diffraction in a $4f$ imaging system, the beam profile of the ${\text{CO}}_2$ laser is imaged onto a CCD camera by the probe laser.

© 2008 Optical Society of America

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