Probe light homogenizing system and probe light homogenizing method of random reflection surface speed interferometer

A reflective surface and interferometer technology, which is applied in the field of laser detection, can solve the problems of the reduction and increase of laser energy utilization, and achieve the effects of controllable illumination area size, uniform spot distribution and good applicability

Active Publication Date: 2017-05-10
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the blurring is serious, it can indeed achieve a certain homogenization effect, but after defocusing, the illumination spot will increase greatly, resulting in a sharp decrease in the energy utilization rate of the laser

Method used

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  • Probe light homogenizing system and probe light homogenizing method of random reflection surface speed interferometer
  • Probe light homogenizing system and probe light homogenizing method of random reflection surface speed interferometer
  • Probe light homogenizing system and probe light homogenizing method of random reflection surface speed interferometer

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Embodiment

[0050] figure 2 It is a schematic diagram of the effect of obtaining a parallel beam with a diameter of φ1mm after the beam of numerical aperture NA=0.27 emitted from the center point of the fiber end face 1 passes through the homogenization system. figure 2 The parameters in are:

[0051] f 1 - the focal length of the collimating lens 2;

[0052] d 1 - the distance between the collimator lens 2 and the front group 3 of the reducer;

[0053] f 2 - the focal length of the front group 3 of the beam reducer;

[0054] f 3 - the focal length of group 5 after the reducer;

[0055] d 2 - the distance between the beam reducer group 5 and the virtual fiber end face 6;

[0056] NA-Numerical aperture of the beam at fiber end face 1;

[0057] NA' - the numerical aperture of the beam at 6 places on the virtual fiber end face;

[0058] α is the exit half-angle of the exit beam at fiber end face 1;

[0059] NA'=NA=sin α;

[0060] D. 1 - beam aperture after being collimated by...

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Abstract

For settling a problem of homogenizing VISAR probe light illumination, the invention provides a probe light homogenizing system of a random reflection surface speed interferometer. The probe light homogenizing system comprises fiber output laser, a collimating lens and a beam compressing mirror. The collimating lens is arranged in the output optical path of the fiber output laser. Furthermore the focal plane of the collimating lens is arranged at the optical fiber end surface of the fiber output laser. The beam compressing mirror comprises a beam compressing mirror front set and a beam compressing mirror back set. The beam compressing mirror front set is arranged in an output optical path of the collimating lens. The beam compressing mirror back set is arranged in an output optical path of the beam compressing mirror front set. Furthermore the focal plane of the beam compressing mirror front set is superposed with the focal plane of the beam compressing mirror back set, thereby forming a Kepler telescope structure. The fiber core diameter D0 of the fiber end surface, the focal length f1 of the collimating lens, the focal length f2 of the beam compressing mirror front set, and the focal length f3 of the beam compressing mirror back set satisfy a relationship which is shown in the description, wherein alpha is an emergent half-angle of the emergent light beam of the fiber end surface, and furthermore f2>f1>5mm.

Description

technical field [0001] The invention belongs to the technical field of laser detection, and relates to a probe light homogenization system and a homogenization method of an arbitrary reflection surface velocity interferometer. Background technique [0002] Velocity Interferometer System for AnyReflector (VISAR for short) is an active, high spatial resolution velocity interferometer with probe light based on the Doppler frequency shift effect generated by the reflection of light on the surface of a moving object. instrument. VISAR is widely used in the research of inertial confinement fusion (ICF) at home and abroad. It is the most important wave profile testing equipment developed in recent decades. Leigh-Taylor experiments, pulse shaping experiments, etc. [0003] The probe light of VISAR uses a laser of a certain wavelength. The probe optical system usually consists of four parts: a laser, an output fiber, a beam pre-shaping optical path, and a probe forming optical path...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/58
CPCG01S17/58
Inventor 闫亚东何俊华王峰韦明智彭晓世徐涛
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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