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Band-pass filtering fiber laser

A fiber laser and band-pass filtering technology, which is applied in lasers, laser components, phonon exciters, etc., can solve problems such as spectrum broadening noise, and achieve the effect of suppressing short-wavelength ASE or long-wavelength ASE phenomena

Active Publication Date: 2013-09-11
深圳市同昇光电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose a fiber laser with bandpass filtering, which has a frequency selection function and can overcome the problem of spectrum broadening noise existing in the fiber laser. It has a simple structure and good output stability

Method used

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  • Band-pass filtering fiber laser
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Experimental program
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Effect test

Embodiment 1

[0021] Such as figure 1 A fiber laser with a band-pass filtering function is shown, the seed source light source 10 is coupled into a photonic crystal fiber device 50 for band-pass filtering after passing through an isolator 20, a primary amplifier 30, an isolator, a secondary amplifier 40, and an isolator In the process, the noise generated by the nonlinear effect in the frequency spectrum is filtered out, and the output is amplified after entering the final amplifier 60 to obtain a high-power pulsed laser output.

[0022] Wherein, the seed source laser 10 may be a seed laser based on the gain-switch principle, or a seed source laser Q-switched by AOM, with a wavelength of 1063 nm.

[0023] The photonic crystal fiber device 50 for bandpass filtering is composed of two or more sections of bandgap photonic crystal fiber. The difference between photonic crystal fiber and conventional communication fiber lies in the light guiding mechanism of the fiber. The relative refractive ...

Embodiment 2

[0026] The difference from Embodiment 1 is that the band-pass filtering photonic crystal fiber device 50 adopts a single bandgap photonic crystal fiber, and a photonic crystal fiber prefabricated rod stacked by a 7-core defective 7-layer capillary is drawn into an outer A fiber with a diameter of 125 microns, the light guide waveband of the fiber is from 1060nm to 1292nm, such as figure 2 Shown in curve 2. The band-pass filtered photonic crystal fiber device is spliced ​​before the final amplifier, and the short-wavelength ASE problem of the fiber laser can be suppressed by using the single-side filtering performance of the band-gap photonic crystal fiber. The overall insertion loss of the device is less than 0.7dB.

Embodiment 3

[0028] The difference from Embodiment 1 is that the photonic crystal fiber device 50 for bandpass filtering adopts a single bandgap photonic crystal fiber, a photonic crystal fiber prefabricated rod stacked by a 7-core defective 7-layer capillary tube, drawn into an outer diameter 105 micron optical fiber, the light guide waveband of the optical fiber is from 850nm to 1063.5nm, such as figure 2 Shown in curve 1. The band-pass filtered photonic crystal fiber device is spliced ​​before the final amplifier, and the long-wavelength ASE problem of the fiber laser can be suppressed by using the single-side filtering performance of the band-gap photonic crystal fiber. The overall insertion loss of the device is less than 0.7dB.

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Abstract

The invention discloses a band-pass filtering fiber laser comprising a seed source, multi-stage amplifiers and a photonic crystal fiber. The multi-stage amplifiers are coupled with the seed source, the photonic crystal fiber is connected in front of the last-stage amplifier and behind the second-last-stage amplifier, wave length of the transmission spectrum of the photonic crystal fiber ranges from A nanometers to B nanometers, and the photonic crystal fiber is used for suppressing spectrum broadening noise generated by the amplifiers and with wave length lower than the A nanometers or higher than the B nanometers. The photonic crystal fiber comprises two sections with ends welded, the wave length of the transmission spectrum of one section ranges from 850 nanometers to 1063.5 nanometers, and the wave length of the same of the other section ranges from 1060 nanometers to 1292 nanometers. The band-pass filtering fiber laser is formed by welding two or more sections of band-gap photonic crystal fibers with different light guide wave length, noise to be about to enter high-power amplified signals can be removed, and peak power of the laser after amplification is increased.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a band-pass filter fiber laser. Background technique [0002] In recent years, fiber laser technology has gradually matured, and it has gradually replaced some gas lasers and solid-state lasers in market applications. The advantages of fiber lasers are the cavity with an all-fiber structure, stable laser wavelength, power and other parameters, and low post-use and maintenance costs. [0003] Compared with gas lasers, fiber lasers have a wider output laser wavelength. The wavelength of gas lasers is usually less than 1nm and does not broaden in the laser cavity. Gas lasers are usually continuous laser output, so their peak power is generally relatively small. For example, He—Ne lasers are usually milliwatt-level continuous laser output, and the laser wavelength is usually at 632.8nm. The Ar+ laser can output single wavelength or multi-wavelength output. The single wavelength can be selected f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/07H01S3/10
Inventor 翟真德李伦聪
Owner 深圳市同昇光电有限公司