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All-fiber cascade laser amplification method and device with polarization controlled automatically and stably

An automatic stabilization and laser amplification technology, applied in the laser field, can solve problems such as immature manufacturing process, difficulty in making double-clad gain fiber, and restrictions on popularization and application, so as to maintain good pulse time spectrum waveform and reduce high-order nonlinearity Optical effects, effects with many adjustable parameters

Inactive Publication Date: 2014-07-02
SHANGHAI LANGYAN OPTOELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve this problem, the previous solutions mostly used polarization-maintaining photonic crystal fiber or double-clad gain fiber to maintain polarization-stable output, but the production of polarization-maintaining large-mode-field photonic crystal fiber and double-clad gain fiber is difficult and expensive , the use of fusion splicing is not very convenient, the manufacturing or assembly process is more complicated, and other devices in the optical path of the laser amplification system also use polarization-maintaining optical fibers accordingly, which further increases the cost, and the manufacturing process of large-mode polarization-maintaining optical components is also relatively poor. Mature
These factors limit the general application of this method

Method used

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  • All-fiber cascade laser amplification method and device with polarization controlled automatically and stably
  • All-fiber cascade laser amplification method and device with polarization controlled automatically and stably
  • All-fiber cascade laser amplification method and device with polarization controlled automatically and stably

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Embodiment 1

[0033] refer to figure 2, is a schematic diagram of the device of the present invention based on a one-stage forward pre-amplification structure, which includes a seed source 000, a one-stage pre-amplification structure 110 based on a Faraday rotating mirror, and a main amplification structure 200 based on a Faraday rotating mirror. The seed source 000 can be a Q-switched pulse laser or a mode-locked pulse laser. The primary pre-amplification structure 110 includes: a polarization maintaining fiber isolator 111, a polarization beam splitter 112, a semiconductor laser 113, a wavelength division multiplexer 114, Erbium-doped gain fiber 115 and Faraday rotating mirror 116 . The common end of the polarization beam splitter 112 is an ordinary non-polarization-maintaining single-mode optical fiber, the preferred wavelength of the semiconductor laser 113 is 976nm, the preferred single-mode optical fiber of the erbium-doped gain fiber 115, and the Faraday rotator 116 has a wavelength...

Embodiment 2

[0036] refer to image 3 , is a schematic diagram of the device of the present invention based on a one-stage inverse pre-amplification structure, which includes a seed source 000, a one-stage pre-amplification structure 110 based on a Faraday rotating mirror, and a main amplification structure 200 based on a Faraday rotating mirror. The seed source 000 can be a Q-switched pulse laser or a mode-locked pulse laser. The primary pre-amplification structure 110 includes: a polarization maintaining fiber isolator 111, a polarization beam splitter 112, a semiconductor laser 113, a wavelength division multiplexer 114, Erbium-doped gain fiber 115 and Faraday rotating mirror 116 . The common end of the polarization beam splitter 112 is an ordinary non-polarization-maintaining single-mode fiber, the preferred wavelength of the semiconductor laser 113 is 976nm, the preferred gain fiber 115 is an erbium-doped ion single-mode fiber, and the Faraday rotator 116 has a wavelength greater than...

Embodiment 3

[0039] refer to Figure 4 , is a schematic diagram of the device of the present invention based on the secondary forward pre-amplification structure, which includes the seed source 000, the secondary pre-amplification structures 110, 120 based on the Faraday rotating mirror and the main amplification structure 200 based on the Faraday rotating mirror. The seed source 000 can be a Q-switched pulse laser or a mode-locked pulse laser. The secondary pre-amplification structures 110 and 120 include: polarization-maintaining fiber isolators 111 and 121, polarization beam splitters 112 and 122, and semiconductor lasers 113 and 123 , wavelength division multiplexers 114, 124, erbium-doped gain fibers 115, 125 and Faraday rotating mirrors 116, 126. The common end of polarization beam splitter 112, 122 is common non-polarization-maintaining single-mode fiber, semiconductor laser 113, 123 operating wavelength is preferably 976nm, gain fiber 115, 125 is preferably erbium-doped single-mode...

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Abstract

The invention discloses an all-fiber cascade laser amplification method and device with polarization controlled automatically and stably. The device comprises a seed resource, a one-stage or multi-stage pre-amplification structure based on Faraday rotation mirrors and a main amplification structure based on Faraday rotation mirrors. Pulsed light output by the seed source in a polarization-maintaining mode sequentially passes through the one-stage or multi-stage pre-amplification structure based on the Faraday rotation mirrors and the main amplification structure based on the Faraday rotation mirrors. According to the all-fiber cascade laser amplification method and device, on the basis of the effects of the Faraday rotation mirrors and polarization beam splitters, pulse power amplification is achieved by the adoption of an ordinary non-polarization-maintaining optical fiber device, meanwhile fixed linear polarization high-power pulse laser is output, a cascade amplification structure is adopted, pulses are widened under the effect of self-phase modulation, the high-order nonlinear effect is effectively weakened, and the pulse shape is kept good. By adjusting the types, the lengths and the pump light power of all the amplification structures, polarization-maintaining pulse laser output with different parameters such as power and pulse widths can be achieved.

Description

technical field [0001] The invention belongs to the field of laser technology, and relates to an all-fiber cascaded laser amplification method and device with automatic polarization stabilization control. Background technique [0002] Fiber lasers have the advantages of good beam quality, high conversion efficiency, compact structure, and long life, and have been developed rapidly in recent years. Among them, high-power pulsed fiber lasers have the characteristics of good gain characteristics, short action time, high peak power, flexible use, convenient connection with optical fiber communication systems, and no need for water cooling. The field has been widely used, and it is also one of the frontier directions in the field of optoelectronic information. [0003] High-power pulsed fiber lasers are usually composed of a low-power seed source and a multi-stage power amplifier, namely MOPA (Master Oscillator Power Amplifier). The devices in the seed source and the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/23H01S3/067H01S3/13
Inventor 曾和平王超
Owner SHANGHAI LANGYAN OPTOELECTRONICS TECH
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