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Macroenergy and long pulse 1 [mu]m single-frequency nanosecond laser device for laser coherent wind finding radar

A nanosecond laser, wind radar technology, applied in lasers, semiconductor lasers, laser parts and other directions, can solve the problem of low amplification efficiency, affecting the amplifier amplification efficiency, output laser signal-to-noise ratio, single-frequency stability and beam quality, Unfavorable pulse laser amplification and other problems, to achieve the effect of suppressing ASE, improving amplification efficiency, and improving signal-to-noise ratio

Active Publication Date: 2021-12-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent uses continuous LD as the pump source, which has low amplification efficiency and is not conducive to pulsed laser amplification; and it is difficult to completely suppress the stimulated spontaneous emission (ASE) in the amplification process only by processing the end face of the laser crystal into a certain angle, resulting in The output pulse laser will be mixed with ASE components, which will affect the amplification efficiency of the amplifier and the signal-to-noise ratio, single frequency, stability and beam quality of the output laser

Method used

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  • Macroenergy and long pulse 1 [mu]m single-frequency nanosecond laser device for laser coherent wind finding radar
  • Macroenergy and long pulse 1 [mu]m single-frequency nanosecond laser device for laser coherent wind finding radar
  • Macroenergy and long pulse 1 [mu]m single-frequency nanosecond laser device for laser coherent wind finding radar

Examples

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Embodiment 1

[0051] A high-energy, long-pulse 1μm single-frequency nanosecond laser for laser wind radar, such as figure 2 As shown, it includes a single-frequency continuous laser seed source 1, a double acousto-optic modulator, a beam shaper 4, a first pinhole diaphragm 5, a three-stage end-pumped single-pass preamplifier, and an electro-optic chopper arranged sequentially along the optical path. 38. One-stage main amplifier;

[0052] The three-stage end-pumped single-pass pre-amplifier includes a first-stage end-pumped single-pass pre-amplifier, a second-stage end-pumped single-pass pre-amplifier, and a third-stage end-pumped single-pass pre-amplifier;

[0053] The single-frequency continuous seed light emitted by the single-frequency continuous laser seed source 1 is converted into a long-pulse single-frequency nanosecond pulse laser by double-acousto-optic modulators and double-acousto-optic modulation. High-contrast pulsed laser with semi-Gaussian rising edge and steep falling edge...

Embodiment 2

[0077] According to a kind of lidar wind measuring radar described in embodiment 1, it is different in that: as image 3 As shown, the first-stage main amplifier is a partially end-pumped hybrid cavity slab amplifier, and the laser also includes a plano-convex cylindrical mirror 44 used in the first vertical direction, a plano-convex cylindrical mirror 45 used in the first horizontal direction, and a height of 0°1 μm Anti-wedge mirror 46, slab laser crystal 47, 0° dichroic mirror 48, spherical lens group 49, plano-convex cylindrical mirror group 50 used in the first horizontal direction, planar waveguide 51 used in the horizontal direction, and planar lens group used in the second horizontal direction Convex cylindrical mirror group 52, pulsed LD array 53, 45° 1 μm high reflective wedge mirror 54, sixth 45° 1 μm high reflective mirror 55, plano-convex cylindrical mirror 56 used in the second vertical direction, and used in the third horizontal direction Plano-convex cylindrica...

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Abstract

The invention relates to a large-energy long-pulse 1 [mu]m single-frequency nanosecond laser device for a laser coherent wind finding radar. The laser device is characterized in that a 1 [mu]m single-frequency continuous laser device is used as a seed source so as to guarantee the frequency and line width stability of the whole system; a pulse semiconductor laser device (LD) is adopted as a pumping source, so that the pulse amplification efficiency is effectively improved, and spontaneous emission amplification (ASE) in the amplification process is restrained; continuous seed light is chopped into high-contrast pulse laser of which the rising edge is in a semi-Gaussian waveform and the falling edge is steep through two acousto-optic modulators; the pulse energy is continuously improved through a rear end pump-side pump / lath hybrid amplification stage while the pulse width is gradually broadened by utilizing a pulse shaping effect caused by gain saturation; and ASE in the amplification process of each amplification stage is effectively inhibited by adopting a method of adding a small-hole diaphragm and optimizing the pulse width of pump light of each stage.

Description

technical field [0001] The invention belongs to the technical field of all solid-state lasers, and in particular relates to a long-pulse 1 μm single-frequency nanosecond laser with a pulse width of hundreds of ns and a large energy for laser coherent wind measuring radar. Background technique [0002] Laser coherent wind radar has huge application requirements in military and civil fields such as near-Earth space military environment forecast, extreme weather warning, wind energy utilization, and air pollution monitoring. The laser light source is the core key component of the coherent wind radar, and its performance index directly determines the detection range, sensitivity and accuracy of the coherent wind radar. It can be seen from the interference theory that to obtain an obvious interference effect, the maximum optical path difference where the interference effect occurs is required to be smaller than the coherence length. Therefore, long-distance coherent wind radar re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/00H01S3/0941H01S3/117H01S5/00H01S5/02253H01S5/04H01S5/06G01S7/484G01S17/95
CPCH01S3/0057H01S3/117H01S3/0071H01S3/0941H01S5/0057H01S5/0071H01S5/02253H01S5/0615H01S5/041G01S17/95G01S7/484Y02A90/10
Inventor 张百涛施炳楠李佳桐聂鸿坤叶帅杨克建李涛何京良王冲
Owner SHANDONG UNIV