A measuring device for mid-infrared blazed grating diffraction efficiency

Abstract

A measuring device for the diffraction efficiency of a mid-infrared grating, which includes a tunable mid-infrared test laser, a guiding laser, a polarizing device, a polarization splitting device, a grating to be measured, a three-dimensional electric displacement stage, a photodetector, an attenuation sheet, and a spectrometer. The mid-infrared grating is used to directly measure the diffraction efficiency of the mid-infrared grating with different wavelengths, different incident angles, and different polarization characteristics of the first-order diffraction output power of the mid-infrared grating, which more truly reflects the practical application of the mid-infrared grating. The actual diffraction efficiency of . The measurement accuracy is guaranteed by using polarization spectroscopic measurement and dual optical path dual detector comparison detection. The continuous measurement of the first-order spectral diffraction efficiency of the grating in the mid-infrared band can be realized.

Description

technical field [0001] The invention relates to grating diffraction efficiency, in particular to a measuring device for mid-infrared grating diffraction efficiency. Background technique [0002] Lasers in the mid-infrared band have important applications in the fields of photoelectric countermeasures, laser remote sensing, laser detection, and component analysis. Certain mid-infrared lasers such as HF / DF lasers, CO lasers, CO 2 Lasers and the like oscillate simultaneously at multiple wavelengths. In actual work, in order to obtain laser output at a specific wavelength, a wavelength-selective resonator must be used. Usually this kind of resonant cavity often includes a wavelength selector, and the mid-infrared diffraction grating concentrates the light energy to the -1 order spectrum, which is a good wavelength selector. The first-order diffraction efficiency of the mid-infrared grating directly determines the loss of the laser resonator, so the measurement of the diffract...

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Problems solved by technology

In addition, because the center wavelength of the test light source will drift with time and changes in the external environment, this will also cause inaccurate measurement results.

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