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High-energy long pulse laser obtaining device, method and application

A long-pulse, high-energy technology, used in lasers, laser parts, phonon exciters, etc., can solve the problems of wide tuning range, increased difficulty in controlling longitudinal modes, and difficulty in obtaining single-frequency narrow linewidth laser output, etc. achieve the effect of eliminating relaxation peaks

Inactive Publication Date: 2016-01-13
INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inherent relaxation oscillation characteristics of the solid-state laser gain medium, the output long-pulse laser has an irreversible relaxation peak, which is easy to damage the optical components in the application, or saturate the high-speed photodetector and affect the measurement
At the same time, the existence of relaxation oscillation peaks makes it more difficult to control the longitudinal mode, which is prone to mode hopping, and it is difficult to obtain a stable single-frequency narrow-linewidth laser output.
In addition, since the emission bandwidth of solid gain media around 1 μm is usually only tens of GHz, it is difficult for resonant cavity technology to obtain a wide tuning range

Method used

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  • High-energy long pulse laser obtaining device, method and application
  • High-energy long pulse laser obtaining device, method and application
  • High-energy long pulse laser obtaining device, method and application

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Embodiment 1

[0029] Such as figure 1 As shown, a high-energy long-pulse laser acquisition device, according to the direction of laser transmission, sequentially includes: a continuous laser source 1, an isolator 2, an electro-optic modulator 3, a half-wave plate 4, a polarizer 5 and a laser amplifier 6.

[0030] Continuous laser source 1 is a fiber laser or a solid-state laser, the output laser is a tunable continuous single-frequency laser, the polarization state is p-polarized, the central wavelength is tunable within the range of 1064.5nm±1.0nm, the output power is 100mW~10W, and the linewidth is less than 100kHz.

[0031] The isolator 2 is a combination of optical crystals, wave plates and polarizers. Its function is to allow the laser output from the continuous laser source 1 to pass through in one direction, while the reverse light of the optical components behind the isolator 2 cannot return to the continuous laser source through the isolator 2. 1. Isolation > 20dB.

[0032] The ...

Embodiment 2

[0045] In this embodiment, the same parts as those in Embodiment 1 will not be described again, but the difference is that the polarization state of the seed light is s polarization, the laser reflectance of polarizer 5 to p polarization is greater than 99%, and the laser transmittance to s polarization Greater than 95%.

[0046] When the p-polarized laser light after the electro-optic modulator 3 is selected as the target laser light, a half-wave plate 4 needs to be added before the polarizer 5 to change the polarization state of the target laser light from p-polarized to s-polarized; When the s-polarized laser light after the electro-optic modulator 3 is used as the target laser light, it is not necessary to add a half-wave plate 4 before the polarizer 5 .

Embodiment 3

[0048]Tunable single-frequency 1064nm continuous laser source 1 is a solid-state laser output space, the vacuum center wavelength is 1063.5nm, the line width is 5kHz, the output power is 100mW, the polarization state is s linearly polarized light, the spot diameter is Φ1.0mm, and the beam quality is M 2 = 1.02.

[0049] The electro-optic modulator 3 uses a single LN crystal, the modulation voltage is 1200V, the modulation pulse width is 150μs, the repetition frequency is 50Hz, and the modulation signal waveform is a sine wave.

[0050] The half-wave plate 4 is not used, and the reflectance of the polarizing plate 5 to the s-polarized laser is greater than 99%, and the transmittance to the p-polarized laser is greater than 95%.

[0051] The solid amplifier 6 is a two-stage double-pass structure, the gain medium is Nd:YAG rod, the pump pulse width is 200μs, the amplified laser output single pulse energy is 200mJ, the average power is 10W, and the beam quality is M 2 =1.2, the l...

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Abstract

The invention discloses a high-energy long pulse laser obtaining device, method and application. The high-energy long pulse laser obtaining device sequentially comprises a continuous laser source, an isolator, an electro-optic modulator, a polarizing plate and a laser amplifier in a laser transmission direction. According to the high-energy long pulse laser obtaining device, a continuous narrow-linewidth tunable single-frequency laser device is adopted as a seed source; the amplified laser is still tunable single-frequency narrow-linewidth laser when having relatively high energy; the center wavelength is the same as that of the seed source; the pulse width is determined by the pulse width of a modulation signal; and an output pulse waveform is determined by a modulation signal waveform, a modulation laser pulse and a time sequence of an amplifier-stage pump pulse, and is a smooth waveform.

Description

technical field [0001] The invention relates to the field of all-solid-state lasers, in particular to a high-energy long-pulse laser acquisition device, method and application. Background technique [0002] In systems such as laser sodium guide stars, gravitational wave detection, and lidar, tunable 1064nm lasers with long pulses of 100 microseconds are required, and the laser linewidth and longitudinal mode are controlled. At the same time, in order to facilitate the application, the laser pulse waveform should be as smooth as possible, and the spectral lines should be as stable as possible. [0003] The existing high-energy 100-microsecond all-solid-state long-pulse laser is mainly obtained by pumping the resonant cavity of the solid gain medium with a quasi-continuous diode laser, that is, the pulsed laser is directly obtained from the oscillator cavity, and then the energy of the pulsed laser is expanded. However, due to the inherent relaxation oscillation characteristi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/101H01S3/10
Inventor 张卫任怀瑾鲁燕华张雷许夏飞高松信魏彬刘芳
Owner INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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