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All-solid-state Raman frequency multiplication dark red laser and laser generation method

A deep red, all-solid-state technology, applied in the direction of lasers, laser components, phonon exciters, etc., can solve the problems of high cost, bulky, lack of high performance, etc., achieve high average power and high peak power, and reduce volume and cost, the effect of beam quality purification

Pending Publication Date: 2020-09-29
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium sapphire lasers and alexandrite lasers are relatively mature in development. At present, deep red laser output with high power and high beam quality has been obtained, but their pump sources often have problems such as complex systems, large volumes, and high costs.
In recent years, vertical-cavity surface-emitting lasers have developed rapidly, and continuous deep-red laser output above watts has been achieved through vertical-cavity surface-emitting lasers and frequency-doubled vertical-cavity surface-emitting lasers. However, due to the lack of high-performance 0.75 micron and 1.4 micron bands Semiconductor compound materials, so the output power of deep red laser is still limited

Method used

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  • All-solid-state Raman frequency multiplication dark red laser and laser generation method

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Effect test

Embodiment 1

[0027] figure 1 It is a schematic diagram of an optical path of an all-solid-state Q-switched Raman frequency-multiplied deep red laser of the present invention. The pump source 1 is a fiber-coupled 880nm semiconductor laser (the fiber diameter is 200 microns, and the numerical aperture is 0.22); the pump light passes through the collimating lens 2 with a focal length of 50 mm and the focusing lens 3 with a focal length of 250 mm in sequence, and then injects into the laser crystal 5 , with a focal spot diameter of 1 mm. Laser crystal 5 chooses 4×4×40mm 3 , 1at.% doped Nd:YLF crystal, coated with 880nm, 1047-1053nm and 1314-1321nm anti-reflection coatings on both ends. The Q-switching device 6 is an acousto-optic Q switch, the ultrasonic frequency is 27.12MHz, the radio-frequency power is 100W, and the two ends are coated with 1314-1321nm anti-reflection film; the acousto-optic Q-switching is used to generate nanosecond pulse laser with high peak power to improve Raman and ...

Embodiment 2

[0030] figure 2 It is a schematic diagram of the optical path of a high-power side-pumped all-solid-state Q-switched Raman frequency-multiplied deep red laser of the present invention. This embodiment is further improved on the basis of Embodiment 1. The difference between it and Embodiment 1 is : The pump source 1 pumps the laser crystal 5 from the side, without the collimator lens 2 and the focusing lens 3; the side pump structure can effectively increase the pump power applied to the laser crystal 5, thereby increasing the output power of the deep red laser.

Embodiment 3

[0032] image 3It is a schematic diagram of the optical path of an all-solid-state continuous Raman frequency-doubling deep red laser of the present invention. This embodiment is further improved on the basis of Embodiment 1. The difference between it and Embodiment 1 is that there is no modulation in the resonant cavity. Q device 6 to achieve continuous deep red laser output.

[0033] In summary, the deep red laser disclosed in the present invention has many advantages such as high output power, good beam quality, simple structure, stable performance, and low cost, and has important applications in the fields of laser display, biophotonics, fluorescence imaging, photodynamic therapy, etc. .

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Abstract

The invention discloses an all-solid-state Raman frequency multiplication dark red laser and a laser generation method. The laser includes a pumping unit, an input endoscope (4), a laser crystal (5),a polarizing film (7), a first insertion lens (8), a Raman crystal (9), a second insertion lens (10), a nonlinear optical crystal (11) and an output endoscope (12), the input endoscope (4) and the output endoscope (12) form a fundamental frequency light resonant cavity, and the first insertion lens (8) and the output endoscope (12) form a Raman light resonant cavity; the dark red laser has the advantages of being high in output power, good in light beam quality, simple in structure, stable in performance, low in cost and the like, and has important application in the fields of laser display, biophotonics, fluorescence imaging, photodynamic therapy and the like.

Description

technical field [0001] The invention relates to the technical field of solid-state lasers, in particular to an all-solid-state Raman frequency-doubled deep red laser and a laser generating method. Background technique [0002] The deep red laser with a wavelength around 0.75 microns has very low absorption efficiency for water, blood and hemoglobin, and also has a weak scattering effect in the dermal tissue. These characteristics make the deep red laser have greater penetration in biological tissues. Therefore, it has important application value in the fields of fluorescence imaging, photodynamic therapy and stimulated emission depletion microscopy. [0003] At present, the ways to obtain deep red laser mainly include titanium sapphire laser, alexandrite laser, vertical cavity surface emitting laser and frequency doubled vertical cavity surface emitting laser. Titanium sapphire lasers and alexandrite lasers are relatively mature in development, and have obtained deep red la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/108H01S3/109H01S3/0941H01S3/16
CPCH01S3/0941H01S3/1086H01S3/109H01S3/1611H01S3/1653
Inventor 代世波赵辉朱思祁尹浩李真陈振强
Owner JINAN UNIVERSITY
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