Spatially insensitive focusing alignment method and system for dual-beam pumping-detection

A dual-beam, space technology, applied in the field of lasers, can solve the problems of strict beam spatial focusing and alignment, and the ratio of the spot sizes of the two beams is not easy to adjust independently, and achieves the effect of alleviating the adjustment requirements.

Active Publication Date: 2019-03-15
BEIJING GREAT WALL PEONY MOLD MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention expands the focal depth of the pump beam by introducing a beam shaping system, thereby solving the problems that the spatial focus

Method used

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  • Spatially insensitive focusing alignment method and system for dual-beam pumping-detection
  • Spatially insensitive focusing alignment method and system for dual-beam pumping-detection

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Experimental program
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Embodiment 1

[0073] figure 1 It is a schematic diagram of an improved pump-probe optical system provided by an embodiment of the present invention.

[0074] Bessel beam shaping is implemented for the pump light only. For the pump light (red light), a positive conical mirror system is used to generate a loosely focused Bessel beam with a large spot size, and then a narrowed beam 4f system is used to generate a tightly focused Bessel beam with the spot reduced to a specific size; for the probe light ( Green light) uses a polarizing beamsplitter prism and a λ / 4 wave plate to detect the feedback signal, and inserts a 45° dichroic mirror in front of the focusing objective lens to couple the detection light and pump light coaxially into the focusing lens to achieve focus The spatial overlap of the area.

[0075] In the figure: 1 is a femtosecond laser; 2 is a positive lens; 3 is a frequency doubling crystal; 4 is a positive lens; 5 is a dichroic mirror; 6 is a 45° reflector; 7 is a 45° reflec...

Embodiment 2

[0077] figure 2 It is a schematic diagram of another improved pump-probe optical system provided by the embodiment of the present invention. Here, the Bessel beam shaping is realized simultaneously for the pump light and the probe light. For the pump light (red light), a positive conical mirror system is used to generate a loosely focused Bessel beam with a large spot size, and then a narrowed beam 4f system is used to generate a tightly focused Bessel beam with the spot reduced to a specific size; for the probe light ( Green light) Use a polarizing beamsplitter prism and λ / 4 wave plate to detect the feedback signal, and insert a 45° dichroic mirror in front of the conical mirror to couple the detection light and pump light coaxially into the optical shaping system behind , to realize the spatial coincidence of the focal area.

[0078] In the figure: 1 is a femtosecond laser; 2 is a positive lens; 3 is a frequency doubling crystal; 4 is a positive lens; 5 is a dichroic mirr...

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Abstract

The invention belongs to the technical field of lasers and discloses a spatially insensitive focusing alignment method and system for dual-beam pumping-detection. A transmissive positive-cone lens system is adopted in combination with a beam reducing system for performing beam shaping on one path of pumping light separately; by designing parameters of a beam shaping system, a central light spot ofa specific size and a Bessel beam with extended depth of focus are obtained; a polarization beam splitting prism and a lambda/4 wave plate are used for detecting feedback signals for one path of detection light; by inserting a 45-degree dichroic mirror, the detection light and the pumping light are coaxially coupled into a focus lens to achieve spatial overlapping of focal areas. The cross sections of Gauss-Bessel beams obtained by means of beam shaping can be kept unchanged, and the depth of focus can be extended to a long range from 100 micrometers to 100 millimeters, so that the strict adjustment requirement for focus alignment on a sample surface in the pumping-detection is greatly lowered.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a dual-beam pumping-detection space-insensitive focusing alignment method and system. Specifically, it relates to an improved method based on beam shaping. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] The pump-probe technique is a diagnostic tool for obtaining information on ultrafast phenomena, and the general principle is as follows. First, some kind of excitation (or modification) occurs in the sample after it is hit by a strong pump light pulse (time zero). A weak probe light pulse (making no new contribution to the excitation) then hits the sample with an adjustable time delay (controlled by an optical delay line), and its transmitted or reflected signal is measured. Probing the signal as a function of time delay, it is possible to obtain information about the decay of the generated ...

Claims

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Application Information

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IPC IPC(8): G02B27/09
CPCG02B27/0955
Inventor 孙诗明
Owner BEIJING GREAT WALL PEONY MOLD MFG CO LTD
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