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Phase-free modulation pulse pickup method and device based on Pockels cell

A Pockels cell and phase modulation technology, applied in the field of lasers, can solve the problems of low damage resistance threshold and inability to apply high-power laser pulse pickup schemes, etc., and achieve the effects of easy acquisition, simple structure, and easy operation

Active Publication Date: 2021-11-05
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its limitation is that the pulse selection method based on the acousto-optic modulator requires additional optical elements to focus the beam to a smaller spot, so the anti-damage threshold is low, and it cannot be applied to the pulse picking scheme of high-power lasers

Method used

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  • Phase-free modulation pulse pickup method and device based on Pockels cell
  • Phase-free modulation pulse pickup method and device based on Pockels cell
  • Phase-free modulation pulse pickup method and device based on Pockels cell

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 2 As shown, a Pockels cell-based non-phase modulation pulse pickup device, including: a high repetition rate laser 1, a half-wave plate 2, a polarizer 3, a Pockels cell 4, and a polarization analyzer arranged in sequence along the optical path Device 5, described Pockels cell 4 also includes driver, and the Pockels cell driver output waveform is a square wave;

[0033] The center wavelength of the high repetition rate laser 1 is 1064nm, the output power is 200W, the repetition rate is 6.25MHz, and the pulse width is 3ns.

[0034] The angle formed by the fast axis direction of the half-wave plate 2 and the incident laser polarization direction of the laser 1 is half of the angle between the linear polarization direction of the incident laser 1 and the horizontal polarization direction, so that the transmittance of the polarizer 3 is the highest.

[0035] The polarizer 3 and the analyzer 5 are polarizers coated with a film layer corresponding to the incid...

Embodiment 2

[0039] As described in Example 1, the difference is:

[0040] The incident laser incident angle of the polarizer 3 and the polarizer 5 is Brewster's angle corresponding to the incident laser wavelength.

[0041] The Pockels cell 4 uses lithium niobate (LiNbO 3 ) crystal or rubidium titanyl phosphate (RTP) crystal.

Embodiment 3

[0043] The phase-free modulation pulse picking method based on Pockels cell comprises utilizing the device described in embodiment 1:

[0044] The high repetition rate laser 1 emits a high repetition rate laser pulse sequence, which is injected into the system through the half-wave plate 2; the laser beams of the P polarization component and the S polarization component are separated by the polarizer 3;

[0045] When no high voltage is applied to the Pockels cell 4, the pulse sequence of the P polarization component is output from the main optical path through the Pockels cell 4 and the analyzer 5 without any phase modulation;

[0046] When high voltage is applied to the Pockels cell 4, the polarization state of the laser rotates 90 degrees, and then is reflected out of the main optical path by the analyzer 5;

[0047] The high voltage described in this embodiment is a half-wave voltage, and a high voltage of 3600V is applied by a Pockels cell driver.

[0048] The pressurizatio...

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Abstract

The invention relates to a phase-free modulation pulse pickup method and device based on a Pockels cell. The device comprises a high-repetition-frequency laser, a half-wave plate, a polarizer, the Pockels cell and an analyzer which are sequentially arranged along a light path. The method comprises the following steps of: a laser pulse sequence pass with high repetition frequency through a half-wave plate and then is injected into a system; the laser of the P polarization component and the laser of the S polarization component are separated through a polarizer; the laser pulse of the P polarization component enters the Pockels cell, and when the high voltage is not applied to the Pockels cell, the pulse sequence of the P polarization component is output through the Pockels cell and the polarization analyzer without any phase modulation; and when high voltage is applied to the Pockels cell, the polarization state of the laser is rotated by 90 degrees, and then the laser is reflected to the bypass through the polarization analyzer. By adjusting the pressurization time of the Pockels cell, a single-pulse to high-repetition-frequency pulse sequence with linear polarization, high signal-to-noise ratio, high stability and no phase modulation can be obtained.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a method and device for picking up pulses without phase modulation based on Pockels cells. Background technique [0002] High repetition rate lasers have been widely used in laser optical fiber communication, laser space long-distance communication, laser marking, laser cutting and other fields, but the low single pulse energy caused by high repetition rate is also an inevitable result. Since the single pulse energy directly generated from the laser oscillator cavity cannot meet the needs of laser processing, it needs to be realized by some methods of optical pulse energy amplification, such as cavity cavity technology, regenerative amplification technology and traveling wave amplification technology. The most important thing is Reduce the repetition rate of the high repetition rate laser to pick up a single pulse or a pulse train; in the field of material analysis, the thermal in...

Claims

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Application Information

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IPC IPC(8): H01S3/11H01S3/10H01S3/115
CPCH01S3/11H01S3/10061H01S3/115
Inventor 程文雍宋琛李大振杨厚文
Owner SHANDONG UNIV
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