Continuous-wave 1.5-micron all-solid-state self-Raman laser safe for human eyes

An eye-safe, self-Raman technology, applied in the field of lasers, can solve problems such as the failure of eye-safe Raman laser output, the decrease of laser and Raman gain, and the small gain of laser and Raman, so as to improve the crystal thermal effect, Effect of Lower Raman Transition Threshold, High Laser and Raman Gain

Pending Publication Date: 2021-08-17
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the frequency shifts from 1.3 μm to 1.5 μm, the laser and Raman gains of the crystal are small, and the thermal effect of the crystal is more serious, resulting in a further decrease in the laser and Raman gains, so the Raman conversion threshold of this band is higher
At present, only pulsed all-solid-state Raman lasers can reach the 1.5 μm Raman conversion threshold due to their high fundamental frequency peak power, and have successfully achieved the output of 1.5 μm human eye-safe pulsed Raman lasers, but continuous wave 1.5 μm human The output of eye-safe Raman lasers has not yet been realized

Method used

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  • Continuous-wave 1.5-micron all-solid-state self-Raman laser safe for human eyes
  • Continuous-wave 1.5-micron all-solid-state self-Raman laser safe for human eyes

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Embodiment 1

[0017] Such as figure 1 As shown, this embodiment includes a laser diode pump source 101 , an optical fiber 102 , a collimating focusing coupling system 103 , an input cavity mirror 104 , a self-Raman crystal 105 and an output cavity mirror 106 .

[0018] Among them, the laser diode pumping source 101 is a semiconductor laser with a wavelength locked near the wavelength of 879nm. Its output wavelength is locked at 879nm and its spectral line width is narrow. 4 The resonant pump absorption peak at 879nm is precisely matched. The laser resonance pumping crystal with a wavelength of 879nm can greatly reduce the quantum deficit of pumping light into laser, reduce the heat deposited in the crystal, greatly reduce the thermal effect of the crystal, obtain higher laser and Raman gain, and reduce Raman conversion threshold. Secondly, the pump source internally uses a Bragg grating to lock the output wavelength (output linewidth <0.3nm), so the central wavelength of the pump laser is...

Embodiment 2

[0024] Such as figure 2 As shown, this embodiment includes a laser diode pump source 201, an optical fiber 202, a collimating focusing coupling system 203, a 45-degree dichroic mirror 204, an input cavity mirror 205, a self-Raman crystal 206, and an output cavity mirror arranged in sequence 207. The pumping light emitted by the laser diode pumping source 201 is coupled out through the optical fiber 202, and the pumping light is amplified by the collimating and focusing coupling system 203, passes through the 45-degree dichroic mirror 204 and the input cavity mirror 205, and enters the self- The Raman crystal 206 is absorbed by the self-Raman crystal 206, the number of particles in the self-Raman crystal 206 is reversed and laser radiation is generated, and a fundamental frequency 1342nm laser is formed in the laser cavity formed by the input cavity mirror 205 and the output cavity mirror 207 oscillation. Since the self-Raman crystal 206 also has excellent Raman frequency sh...

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Abstract

The invention discloses a continuous wave 1.5 [mu] m human eye safe all-solid-state self-Raman laser which comprises a laser diode pumping source, a collimation focusing coupling system, an input cavity mirror, a self-Raman crystal and an output cavity mirror. Pump light emitted by a laser diode pumping source is amplified and focused by the collimation focusing coupling system and then enters the self-Raman crystal through the input cavity mirror, the self-Raman crystal is subjected to population inversion and generates laser radiation, and fundamental frequency laser oscillation with the wave band of 1.3 microns is formed in a laser cavity formed by the input cavity mirror and the output cavity mirror. When the power density of the 1.3-micron-band fundamental frequency laser in the laser cavity reaches a Raman conversion threshold value, the 1.3-micron-band fundamental frequency laser generates continuous wave 1.5-micron-band Raman laser through Raman frequency shift of the self-Raman crystal, and the continuous wave 1.5-micron-band Raman laser is output from the output cavity mirror. The laser has the characteristics of simple and compact structure, high light conversion efficiency and low threshold value.

Description

technical field [0001] The invention relates to a laser, in particular to an all-solid-state self-Raman laser. Background technique [0002] Lasers in the 1.5 μm band are eye-safe and have low transmission loss in the atmosphere and glass media, so they have important applications in optical communications, lidar, medicine, remote sensing, laser ranging and other fields. Stimulated Raman scattering (stimulatedRaman scattering, SRS) is an effective laser frequency conversion technology. The all-solid-state Raman laser uses the SRS effect of the crystal medium to shift the Raman frequency of the 1.3 μm fundamental frequency laser output by common solid-state lasers to the 1.5 μm band to obtain eye-safe laser output, and because the SRS process also has a beam purification effect, it is obtained Compared with the original 1.3μm fundamental frequency light, the 1.5μm Raman laser has better beam quality, narrower pulse width and spectral linewidth. Since stimulated Raman scatte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/0941H01S3/108H01S3/16
CPCH01S3/1086H01S3/0941H01S3/1673
Inventor 樊莉沈君王晓宇向柯赟朱骏钱沁宇
Owner YANGZHOU UNIV
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