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A mid-infrared band ultrafast vortex laser detection device and method thereof

A technology of laser detection and infrared band, which is applied in the field of optics, can solve the problems of poor optical path stability, inconvenient detection switching, inability to detect beam polarization and phase separately, and achieve strong optical path stability, simple overall structure, and better optical path stability. Effect

Active Publication Date: 2022-12-02
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, these interferometry methods generally cannot realize the separate detection of beam polarization and phase, and need to build an additional optical path for phase modulation, which is inconvenient to switch between scalar (vortex) beam and vector (vortex) detection, poor stability of the optical path, and phase modulation cannot be realized. Disadvantages such as simultaneous polarization detection

Method used

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  • A mid-infrared band ultrafast vortex laser detection device and method thereof
  • A mid-infrared band ultrafast vortex laser detection device and method thereof
  • A mid-infrared band ultrafast vortex laser detection device and method thereof

Examples

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Effect test

Embodiment 1

[0068] When the laser light source 1 is a scalar beam, the laser is reflected and transmitted by the first half-wave plate 4 and the polarizing beam splitter 5, and serves as signal light and reference light respectively. After the signal light is reflected to the output mirror 10 by the first total reflection mirror 7, optical heterodyne interference occurs between the reference light and the reference light reflected to the output mirror 10 by the second total reflection mirror 8. At this time, as Image 6 As shown on the left, the CCD image sensor 13 detects its interference signal, and its scalar light beam does not interfere, and is still in a circular spot state;

[0069] When the wave plate group 6 is set between the polarizing beam splitter 5 and the first total reflection mirror 7, the wave plate group 6 can be a second half-wave plate, the signal light rotates the polarization direction through the second half-wave plate, and the polarization direction occurs 90° rot...

Embodiment 2

[0071] When the laser light source 1 is a phase vortex beam, the reference light transmitted from the polarization beam splitter 5 is blocked first, and the signal light reflected from the polarization beam splitter 5 passes through the wave plate group 6, and the wave plate group 6 is a first Two half-wave plates; the signal light rotates the polarization direction through the second half-wave plate, and the polarization direction is rotated by 90°. After the signal light passes through the polarization beam splitter 5, its polarization direction is consistent with the transmission polarization direction of the polarization beam splitter 5, that is, the signal The polarization direction of the light is consistent with that of the reference light;

[0072] When the reference light is not blocked, the signal light and the reference light are reflected and transmitted by the output mirror 10 to generate optical heterodyne interference, and the CCD image sensor 13 observes that th...

Embodiment 3

[0077] When the laser light source 1 is a vector beam (without a helical phase), the laser reflected and transmitted by the first half-wave plate 4 and the polarizing beam splitter 5 are respectively used as signal light and reference light, and the radially polarized light can be decomposed into two beams Linearly polarized light in which both the electric field intensity distribution and the direction of the electric field are orthogonal to each other. On the contrary, two linearly polarized TEM01 modes whose intensity and polarization are orthogonal to each other and have the same phase are superimposed on each other to obtain radially polarized light.

[0078] When the wave plate group 6 is not placed between the polarizing beam splitter 5 and the first total reflection mirror 7, a beam expander 9 is placed between the second total reflection mirror 8 and the output mirror 10, and the signal light is reflected to the output mirror by the total reflection mirror 10. The ref...

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Abstract

The invention discloses an ultrafast vortex laser detection device in the mid-infrared band and a method thereof, comprising a laser light source, a first half-wave plate, a polarizing beam splitter, a reflection assembly and an output mirror; the reflection assembly includes a first total reflection mirror and The second total reflection mirror; the first half-wave plate and the polarization beam splitter are rotated and adjusted, and are arranged on the same collimation optical path with the second total reflection mirror in turn, and the first total reflection mirror is arranged on one side of the polarization beam splitter side; the laser light source first passes through the first half-wave plate and the polarizing beam splitter for reflection and transmission, then passes through the first total reflection mirror and the second total reflection mirror, and finally generates optical heterodyne interference from the reflection and transmission of the output mirror; A CDD image sensor for detecting interference signals is installed at the output mirror. The ultrafast vortex laser detection device and method in the mid-infrared band adopt a simple interference device to realize the detection of the polarization and phase of the scalar and vector beams respectively, and the stability of the optical path is stronger, avoiding the need to build a phase modulation optical path in the traditional method.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a mid-infrared band ultrafast vortex laser detection device and a method thereof. Background technique [0002] As lasers are widely used in laser processing, quantum communication, laser radar, optical storage, laser display and laser weapons and other fields, mid-infrared band lasers have become one of the hotspots of scientific and technological research at home and abroad, and lasers in amplitude, frequency The scalar properties of attributes such as , time, etc. have been fully developed. In recent years, the vector properties of lasers such as polarization and phase have been paid more and more attention. Common polarization types are mainly linear polarization, elliptical polarization, and circular polarization. From the perspective of the spatial distribution of the polarization state, the polarization at any position of this kind of polarized beam is consistent, and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/04G01J1/42
CPCG01J1/0407G01J1/0429G01J1/42G01J2001/4242
Inventor 周伟曹雪柳阳雨鲜安华王昊天沈德元殷雪剑
Owner XUZHOU NORMAL UNIVERSITY
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