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Narrow pulse fiber amplifier

A fiber amplifier, narrow pulse technology, used in lasers, laser parts, optics, etc., can solve the problem that the repetition frequency cannot be freely changed, the pulse repetition frequency is high, achieve high peak power levels, increase peak power, and avoid stimulated distribution. The effect of the Brillouin scattering effect

Inactive Publication Date: 2007-08-08
WUXI RES INST OF APPLIED TECH TSINGHUA UNIV +1
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Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned problem that the pulse repetition frequency is too high or the repetition frequency cannot be changed freely, and to provide a narrow pulse fiber amplifier, which can obtain high-power, narrow-pulse-width laser whose pulse repetition frequency and duration can be freely changed Pulse output

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specific Embodiment

[0026] The system structure shown in Figure 1, wherein the seed source laser 1 adopts semiconductor pump mode-locked Nd:YVO with 1W average power output 4 A solid-state laser with a wavelength of 1064 nm, a pulse width of the seed pulse 9 of 100 ps, ​​and a repetition rate of 100 MHz. The pulse picker 2 uses an acousto-optic modulator and a matching radio frequency power supply to deflect unwanted pulses on the optical path and be absorbed by the absorption box 3 . The pulse picker 2 has a repetition rate of 500kHz, the duration of the pulse picker 2 open state is 100ns, and 10 mode-locked pulses are included in this duration. The selected pulse sequence 10 is coupled into the core of the gain fiber 5 through the seed optical coupling system 4 . The gain fiber 5 is a Yb-doped double-clad polarization-maintaining fiber with a core diameter of 20 μm and an inner cladding diameter of 400 μm. The pump absorption coefficient at 976 nm is 3 dB / m, and the fiber length is 6 m. Both ...

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Abstract

A narrow pulse fiber amplifier belongs to the laser technology field. The fiber amplifier contains the seed source laser, the seed optical coupling system, the gain fiber, the pumped source laser and the pumped coupling system, and the feature is that between the seed source laser and the gain fiber adding the pulse issued by the seed source laser to choose the pulse selector. The selected pulse sequence has the arbitrarily changing repetition frequency, and duration, through the high gain amplification of the fiber amplifier to obtain high-power, narrow pulse width laser pulse output. The invention has the advantages that it makes full use of the narrow pulse width of the seed source laser and the wide gain spectrum and high gain of the fiber amplifier, and adding the pulse selector to make the pulse repetition frequency and duration to be free to change. The invention can obtain narrow pulse width pulse sequence of low repetition frequency, whose single pulse energy and peak power can be significantly improved, but also avoiding the stimulated Brillouin scattering effect.

Description

technical field [0001] The invention relates to an optical fiber amplifier, in particular to a pulsed optical fiber amplifier, belonging to the technical field of lasers. Background technique [0002] Pulsed fiber amplifiers have many advantages such as high efficiency, high power, high gain, simple thermal control management, and good beam quality. They can generate pulses with narrow pulse width and high peak power. Broad application prospects. [0003] Pulsed fiber amplifiers require a low-power pulsed laser as a seed source for amplification. Commonly used seed source lasers include mode-locked lasers and Q-switched lasers. Mode-locked lasers can generate pulses with very narrow pulse widths, which are widely used in industry, scientific research and other fields. However, due to the principle of mode-locking, the pulse repetition frequency is inversely proportional to the laser cavity length. Long, so the repetition rate of the mode-locked laser is very high, generall...

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Application Information

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IPC IPC(8): G02F1/39G02F1/35
CPCH01S3/06754H01S2301/03
Inventor 巩马理闫平叶昌庚李晨柳强黄磊张海涛
Owner WUXI RES INST OF APPLIED TECH TSINGHUA UNIV
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