Device for measuring diffraction efficiency of intermediate infrared blazed grating

Abstract

The invention discloses a device for measuring the diffraction efficiency of an intermediate infrared blazed grating, and the device comprises a tunable intermediate infrared testing laser, a guide laser, a polarization device, a polarization light splitting device, a to-be-measured optical grating, a three-dimensional electric displacement platform, an optical detector, an attenuation piece, and a spectrometer. An intermediate infrared optical grating causes the differences of first-order diffraction output power of intermediate infrared laser with different wavelengths, different incident angles and different polarization characteristics, so the device carries out the direct measurement of the diffraction efficiency of the intermediate infrared optical grating, and more truly reflects the actual diffraction efficiency of the intermediate infrared optical grating in actual application. The device employs polarization light-splitting measurement and double-optical-path detector comparison detection, and guarantees the measurement precision. The device can achieve the continuous measurement of the first-order spectrum diffraction efficiency of the intermediate infrared optical grating.

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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