Supercontinuum variable frequency 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, The effect of reducing requirements

Active Publication Date: 2018-09-07
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Supercontinuum variable frequency laser based on PPLN crystal
  • Supercontinuum variable frequency laser based on PPLN crystal

Examples

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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 supercontinuum variable frequency laser based on PPLN crystals. The laser is composed of a near infrared supercontinuum pumping source, a lens group, PPLN crystals, a temperature control system, a precision adjusting frame and an off-axis parabolic reflector; the lens group is a collimation focusing system formed by a first lens and a second lens; the output end of the near infrared supercontinuum pumping source is located at the focus of the incident surface of the first lens; the PPLN crystals are located in the temperature control system, and the incident end faceis located at the focus of the incident surface of the second lens; the focus of the off-axis parabolic reflector is located at the focus of the incident surface of the second lens, and a center smallhole is coaxial with the output end of the near infrared supercontinuum pumping source, the center of the first lens, the center of the second lens and the centers of the PPLN crystals. According tothe laser, output optical spectrum simultaneously covering visible light, near infrared and middle infrared wave ranges can be achieved by using the near infrared supercontinuum pumping source, the double frequency, sum frequency and difference frequency effects among the PPLN crystals, self-phase position modulation and a stimulated Raman scattering effect. The structure of the laser is compact and the adjustment is simple.

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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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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