Michelson interference type far-infrared light polarization state conversion device and implementation method

Abstract

The invention belongs to the technical field of far-infrared laser, and particularly relates to a Michelson interference type far-infrared light polarization state conversion device and an implementation method thereof. The device comprise a first linear polarizer, a movable mirror, a fixed mirror, a second linear polarizer, a lens and a detector. The far-infrared light polarization state conversion device can achieve periodic adjustment and conversion from linearly polarized light to near-circularly polarized light and then to linearly polarized light, has the advantages of being wide in working wavelength range, good in polarization state conversion effect and the like, and compared with a traditional 45-degree incident ray polarizer mode, the far-infrared light polarization state conversion device utilizes the Michelson interference principle, the optical path difference of two beams of convergent laser can be adjusted at will, the limitation that the polarization state conversion and adjustment process is limited by the distance between a plane mirror and a linear polarizer is broken through, the conversion and adjustment difficulty is lowered, and the conversion and adjustmentof the far infrared polarization state within a wider wavelength range are achieved. Meanwhile, the two beams of convergent laser can completely coincide, and the signal-to-noise ratio of the polarization state of the combined laser is improved.

Description

technical field [0001] The invention belongs to the technical field of far-infrared lasers, in particular to a Michelson interference far-infrared light polarization conversion device and a realization method thereof. Background technique [0002] Polarization characteristics are important parameters to describe the temporal and spatial variation of far-infrared optical field components in addition to radiation frequency, power, and beam quality. For example, in imaging applications, the polarization state of electromagnetic radiation changes with the shape of the surface of the target object. After adding the corresponding polarization detection means, the joint detection of the polarization state and amplitude of electromagnetic radiation during the imaging process can be realized, so-called holographic imaging can be realized. . Therefore, the utilization and detection of polarization states play an important role in the application of electromagnetic radiation. The deve...

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Problems solved by technology

However, due to the limitation of the incident angle of 45 degrees, the plane reflector used to adjust the polarization state must be very close to the offline polarizer, usually within two wavelengths, so as to ensure that the two beams of light that form interference can coincide well. When the distance between the reflector and the linear polarizer is greater than two wavelengths, due to the existence of an incident angle of 45 degrees, the overlapping area of ​​the two laser beams after beam combining becomes smaller, making the polarization state of the combined laser beams impure and the polarization conversion effect worsening. Limitation has a greater impact on far-infrared light with a wavelength of less than 50 microns

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