High-peak power picoseconds laser with flexibly adjustable quantity of output pulses

A high-peak, pulse-number technology, applied in the field of high-peak-power picosecond lasers, can solve problems such as unbearable high pump power, deterioration of laser spot quality, thermal stress effects, etc., to achieve flexible and controllable pulse number, peak High power and good stability

Inactive Publication Date: 2012-11-28
SUZHOU DELPHI LASER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to obtain high gain and high peak power, the gain medium of the traveling wave amplifier is generally a slab structure, but the slab structure needs to reshape the amplified laser multiple times, which will cause the qualit

Method used

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  • High-peak power picoseconds laser with flexibly adjustable quantity of output pulses

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[0027] Example

[0028] According to the above technical scheme, an experimental device with a high peak power picosecond laser whose output pulse number can be flexibly adjusted is constructed. When the pumping optical power is 150w, the pulse repetition rate is 100kHz, the amplifier output power is 4W, and the beam quality factor M is measured with a beam quality analyzer 2 The X and Y direction values ​​are 1.28 and 1.30 respectively. By changing the effective level time of the acousto-optic selector, the number of pulses in a single pulse envelope can be flexibly changed from 1 to several hundred, so as to realize the flexible adjustment of the laser peak power. Observe a single pulse output waveform graph and multiple pulse output waveform graphs. It can be seen from the results that the high peak power picosecond laser with flexibly adjustable output pulse number of the present invention has the advantages of high amplification gain, flexible adjustment of peak power, goo...

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Abstract

The invention relates to a high-peak power picoseconds laser with flexibly adjustable quantity of output pulses. The high-peak power picoseconds laser is characterized in that a semiconductor diode is sequentially linked with a first lens and a second lens, the second lens is linked with a first plane mirror, the first plane mirror is linked with a laser crystal, the laser crystal is linked with a second plane mirror, a picoseconds optical fiber seed source is linked with a fourth lens, the fourth lens is linked with an acousto-optic pulse option selecting device, the acousto-optic pulse option selecting device is linked with a third lens, the third lens is linked with a film polarization sheet, the film polarization sheet is linked with a third plane mirror, the third plane mirror is linked with a Faraday activizer, the Faraday activizer is linked with the first plane mirror, seed light passes though the film polarization sheet, and rotates for 45 DEG in a polarization state through the Faraday activizer, the seed light is reflected inside the laser crystal to be amplified secondarily after amplified for first time, and rotates for 45 DEG in the polarization state when passing the Faraday activizer again, rotates for 90 DEG in a laser polarization state relative to that before amplification, and is output through transmission of the polarization sheet, so that laser is subjected to return-trip amplification.

Description

technical field [0001] The invention relates to a high peak power picosecond laser whose output pulse number can be flexibly adjusted, and belongs to the technical field of high peak power picosecond lasers. Background technique [0002] With its high peak power and narrow pulse width, high-energy picosecond lasers have been widely used in the fields of material fine micromachining, LED scribing, solar photovoltaics, and scientific research. Compared with nanosecond laser, the use of picosecond laser to process materials has the advantages of high precision, extremely small heat-affected area, and no burrs on the processing edge. In order to meet the above-mentioned applications, the peak power of picosecond lasers is generally required to reach the MW level. The current principle of generating picosecond lasers with MW-level peak power is to select from tens of MHz mode-locked seed source lasers through electro-optic or acousto-optic modulation. kHz to hundreds of kHz seed...

Claims

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Application Information

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IPC IPC(8): H01S3/117
Inventor 赵裕兴李立卫
Owner SUZHOU DELPHI LASER
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