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Whole-solid kHz picosecond laser pulse regeneration amplifier

A regenerative amplifier, picosecond laser technology, applied in lasers, laser parts, semiconductor lasers, etc., can solve the problem of low damage threshold of LN crystal Pockels cell, limiting the improvement of regenerative amplifier energy, amplification efficiency, and reduction of beam quality, etc. problems, to achieve the effect of magnification and beam quality assurance, reducing cooling capacity, and solving thermal effect problems

Inactive Publication Date: 2007-10-17
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0007] At present, the all-solid-state kHz Nd:YAG picosecond laser pulse regenerative amplifier pumped by LD mainly has the following problems: (1) The depolarization of the Nd:YAG rod due to the thermally induced birefringence effect reduces the amplification efficiency and beam quality
Due to the addition of four-way amplification, the laser structure is complicated and the cost is increased
(2)KD * When the P crystal Pockels cell operates at high average power, that is, at high repetition frequency, it will produce serious thermal effects, which will increase the loss in the cavity and limit the improvement of the energy of the regenerative amplifier.
Document 2 solves this problem by choosing LN crystal Pockels cells, but the damage threshold of LN crystal Pockels cells is low, and it is easy to break during use, so it is not an ideal choice

Method used

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  • Whole-solid kHz picosecond laser pulse regeneration amplifier
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  • Whole-solid kHz picosecond laser pulse regeneration amplifier

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Embodiment Construction

[0017] In Fig. 1, the first polarizer 1, λ / 2 wave plate 2 and Faraday optical rotator 3 constitute regenerative amplifier seed light import and amplified light export device; 14 constitute the two cavity mirrors of the resonant cavity of the regenerative amplifier.

[0018] After the horizontally polarized mode-locked seed light passes through the first polarizer 1, the λ / 2 wave plate 2 and the Faraday optical rotator 3, it is still horizontally polarized, and is introduced into the regenerative amplification cavity through the second polarizer 4; the light passes through the first λ / 4 wave plate 5 and Pockels cell 6 (at this time, the voltage on the Pockels cell is 0), which is totally reflected after reaching the total anti-cavity mirror, and passes through the first λ / 4 wave plate 5 and Pockels cell again 6 (at this moment, the voltage on the Pockels cell is 0), its polarization direction becomes vertically polarized light, reflected by the second polarizer 4 and the third...

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Abstract

A solid condition kHz pico-second laser burst regenerative amplifier belongs to a omni-solid condition regenerative amplifier, which is characterized in that: the two lumen mirror of the magnifying resonant cavity are consisted of an average lumen formed by a first omni-opposite lumen mirror (7) and a second omni-opposite lumen mirror (14), the inner of the resonant cavity is arranged with a minus lens (12) and a second lambada / 4wave plate (13) arranged between the laser crystal (9) which is a Nd:YAG bar and the second omni-opposite lumen mirror. The fast axis of the wave plate is parallel with the light vector of the inputting linearly-polarized light. The minus lens is arranged between the laser crystal and the second lambada / 4 wave plate or the second lambada / 4 wave plate and the second omni-opposite lumen mirror. The pump source is a continuously worked semiconductor laser diode array (10) and the working frequency is 1kHz. The laser crystal can also be a Nd:YLF bar, here the second lambada / 4 wave plate is needless. The invention reduces the volume and the costs of the system, effectively solves the problem of Nd:YAD regenerative amplifier domino offect, and effectively ensures the magnification and the beam quality.

Description

technical field [0001] The present invention is based on a semiconductor laser diode (LD) as an optical pumping source, which can effectively realize ultrashort laser pulses with a picosecond (ps) pulse width of 10 6 It is an all-solid-state regenerative amplifier with an output laser pulse repetition frequency of kilohertz (kHz). Regenerative amplifiers are indispensable for ultrashort laser pulse applications. The ultrashort laser pulse amplified by the regenerative amplifier can be widely used in the fields of microprocessing of materials, microelectronics, microphotonic devices, micromechanics, precision detection, information and communication, medical treatment and bioengineering. Background technique [0002] Due to the extremely narrow pulse width (10 -10 -10 -15 seconds), has received widespread attention, but its single pulse energy (nanojoules) is low, and single-pass or multi-pass energy amplifiers cannot effectively amplify weak signals. It needs to be effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/39H01S5/00
Inventor 李港陈檬常亮
Owner BEIJING UNIV OF TECH
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