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A supercontinuum frequency conversion laser based on ppln crystal

A supercontinuum and laser technology, applied in the field of supercontinuum frequency conversion laser systems, can solve the problems of difficult to achieve visible light beam combining output, large loss of soft glass fiber, difficulty in melting taper, etc., to achieve compact structure, easy productization, Effect of increasing interaction distance

Active Publication Date: 2021-04-20
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large absorption loss of the silica fiber in the infrared band, and the large loss of the soft glass fiber in the visible and near-infrared bands, it is difficult for the supercontinuum light source based on fiber pumping to simultaneously cover the visible, near-infrared and mid-infrared bands. Ultra-wideband supercontinuum output
In addition, due to the huge melting point difference between the silica fiber and the soft glass fiber, it is difficult to fuse and taper between the silica fiber and the soft glass fiber, so it is also difficult to realize the beam combining of visible light, near-infrared and mid-infrared bands by combining beams output

Method used

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  • A supercontinuum frequency conversion laser based on ppln crystal
  • A supercontinuum frequency conversion laser based on ppln crystal

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Example 1, the near-infrared supercontinuum pump source 1 is a non-polarization-maintaining near-infrared supercontinuum pump source, with a spectral range of 800-2400nm, a peak power P of 10kW, and an output spot diameter d of 20μm. The first lens 21 and the second lens 22 all adopt the achromatic doublet lens with a focal length of 15mm (making A=1) to form a focusing and collimating system, so that the diameter of the light spot incident on the front surface of the PPLN crystal 3 is 20 μm, and the peak power density p 0.032kW / μm 2 . The 800-2400nm wide-spectrum near-infrared laser generated by the near-infrared supercontinuum pump source 1 is collimated by the first lens 21 and focused by the second lens 22 , and then enters the front face of the PPLN crystal 3 . PPLN crystal 3 is MgO:PPLN crystal doped with 5mol% MgO. The PPLN crystal 3 has a length of 50 mm, a thickness of 2 mm, a width of 3 mm, and a polarization period of 6.84 μm. The reflectance of the incide...

Embodiment 2

[0042] Example 2, the near-infrared supercontinuum pump source 1 is a non-polarization-maintaining near-infrared supercontinuum pump source with a spectral range of 800-2400 nm, a peak power P of 20 kW, and an output spot diameter d of about 10 μm. The first lens 21 adopts an aspheric lens with a focal length of 15 mm, and the second lens 22 adopts an aspheric lens with a focal length of 50 mm to form a focusing and collimating system, so that the diameter of the light spot incident on the front surface of the PPLN crystal 3 is 33.3 μm, and the peak power density p 0.023kW / μm 2 . The 800-2400nm wide-spectrum near-infrared laser generated by the near-infrared supercontinuum pump source 1 is collimated by the first lens 21 and focused by the second lens 22 , and then enters the front face of the PPLN crystal 3 . PPLN crystal 3 is MgO:PPLN crystal doped with 5mol% MgO. The PPLN crystal 3 has a length of 50 mm, a thickness of 2 mm, a width of 3 mm, and a polarization period of 6...

Embodiment 3

[0043] Example 3, the near-infrared supercontinuum pump source 1 is a non-polarization-maintaining near-infrared supercontinuum pump source with a spectral range of 800-2400 nm, a peak power P of 10 kW, and an output spot diameter d of about 20 μm. The first lens 21 and the second lens 22 all adopt the achromatic doublet lens with a focal length of 15mm (making A=1) to form a focusing and collimating system, so that the diameter of the light spot incident on the front surface of the PPLN crystal 3 is 20 μm, and the peak power density p 0.032kW / μm 2 . The 800-2400nm wide-spectrum near-infrared laser generated by the near-infrared supercontinuum pump source 1 is collimated by the first lens 21 and focused by the second lens 22 , and then enters the front face of the PPLN crystal 3 . PPLN crystal 3 is MgO:PPLN crystal doped with 5mol% MgO. The PPLN crystal 3 has a length of 50 mm, a thickness of 2 mm, a width of 3 mm, and a polarization period of 29.5 μm. The reflectance of th...

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Abstract

The invention discloses a PPLN crystal-based supercontinuum frequency conversion laser. The invention consists of a near-infrared supercontinuum pump source, a lens group, a PPLN crystal, a temperature control system, a precision adjustment frame and an off-axis parabolic reflector; the lens group is a collimating and focusing system composed of a first lens and a second lens ; The output end of the near-infrared supercontinuum pump source is located at the focus of the incident surface of the first lens; the PPLN crystal is placed in the temperature control system, and the incident end surface is located at the focus of the exit surface of the second lens; the focus of the off-axis parabolic mirror is located at the second lens At the focal point of the exit surface, the central small hole is collinear with the output end of the near-infrared supercontinuum pump source, the center of the first lens, the center of the second lens and the center of the PPLN crystal; the present invention utilizes the near-infrared supercontinuum pump source and the PPLN crystal Between frequency multiplication, sum frequency, difference frequency effect and self-phase modulation, stimulated Raman scattering effect, the output spectrum can cover visible light, near-infrared and mid-infrared bands at the same time, and the structure is compact and easy to adjust.

Description

technical field [0001] The invention relates to a supercontinuum frequency conversion laser system, in particular to a PPLN crystal-based supercontinuum frequency conversion laser. Background technique [0002] In recent years, supercontinuum has played an increasingly important role in the fields of environmental monitoring, meteorological detection, biomedicine, material processing, national defense and security due to its high beam quality of ordinary laser light sources and ultra-wide spectral characteristics of white light sources. At present, in terms of spectrum expansion, there have been reports of supercontinuum light sources in the ultraviolet, visible, near-infrared, short-wave infrared, and mid-infrared bands, and they are gradually commercialized. Usually visible light, near-infrared and short-wave infrared supercontinuum are generated in silica-based optical fibers, and mid-infrared supercontinuum are generated in soft glass optical fibers, such as fluoride opt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35
CPCG02F1/3501G02F1/353G02F1/3528G02F1/354
Inventor 侯静姚金妹张斌陈胜平宋锐李志鸿殷科刘广琛杨林永
Owner NAT UNIV OF DEFENSE TECH
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