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A Space-Insensitive Focusing Alignment Method and System for Dual-beam Pump-Probe

A dual-beam, space technology, applied in the field of lasers, can solve the problems of strict beam space focusing and alignment, and the ratio of the spot sizes of the two beams is not easy to adjust independently, so as to achieve the effect of improving the measurement accuracy.

Active Publication Date: 2022-03-08
BEIJING GREAT WALL PEONY MOLD MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 and alignment of the beam in the traditional pump-probe system is too strict and the spot size ratio of the two beams is difficult to adjust independently

Method used

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  • A Space-Insensitive Focusing Alignment Method and System for Dual-beam Pump-Probe
  • A Space-Insensitive Focusing Alignment Method and System for Dual-beam Pump-Probe

Examples

Experimental program
Comparison scheme
Effect test

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 space-insensitive focusing and alignment method and system for dual-beam pump-detection. The pump light is individually beam-shaped for one path by using a transmission-type positive conical mirror system combined with a beam-shrinking system; By designing the parameters of the beam shaping system, a Bessel beam with a central spot of a specific size and an extended focal depth is obtained; by using a polarization beam splitter and a λ / 4 wave plate in the detection light path to detect the feedback signal; by inserting a The 45° dichroic mirror couples the probe light and the pump light coaxially into the focusing lens to realize the spatial coincidence of the focal area. The Gauss-Bessel beam obtained by beam shaping in the present invention can keep the beam cross-section unchanged, and the depth of focus can extend to a very long range (hundreds of microns to millimeters), which greatly relieves the pump-detection of the beam. Stringent adjustment requirements for focus alignment on the sample surface.

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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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/09
CPCG02B27/0955
Inventor 孙诗明
Owner BEIJING GREAT WALL PEONY MOLD MFG CO LTD