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Passive mode-locked pulsed laser

A pulsed laser and passive mode-locking technology, applied in lasers, laser parts, semiconductor lasers, etc., to avoid high cost, low overall cost, and easy implementation.

Inactive Publication Date: 2011-03-16
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the method proposed by the present invention to realize the multi-wavelength passive mode-locked pulsed laser by using the loss tuning in the optical resonator has not been reported

Method used

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  • Passive mode-locked pulsed laser
  • Passive mode-locked pulsed laser
  • Passive mode-locked pulsed laser

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Embodiment Construction

[0031] In this embodiment, the pumping source includes a 980nm semiconductor laser as a pumping light source and a 980nm / 1550nm wavelength division multiplexer as a pumping optical coupling device, and the optical resonant cavity is a unidirectional annular cavity composed of an optical fiber and an optical fiber isolator. , the devices in the optical resonator include erbium-doped fiber as gain medium, carbon nanotube / polyimide composite film as passive mode-locking device, fiber coupler as coupling-out device, tunable optical attenuator and polarization controller.

[0032] The absorption coefficient of the erbium-doped fiber at 1530nm is 6.1dB / m, the group velocity dispersion at 1550nm is -6.5ps / km / nm, and the length is 4.5m.

[0033] Single-walled carbon nanotube / polyimide composite film has saturated absorption characteristics, wherein the mixing ratio of carbon nanotube and polyimide material is 1:100, the thickness of the polymer film is 0.045mm, and its loss at 1550nm ...

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Abstract

The invention provides a passive mode-locked pulsed laser which simultaneously outputs two or more optical pulses with different wavelength. Under the condition that an optical resonant cavity does not contain an optical filter with two or more transmittance peaks in the gain spectrum of a gain medium, the laser ensures two or more gain peaks of the gain medium to simultaneously have maximum and equal gains by reasonably controlling the loss in the optical resonant cavity and further simultaneously outputs two or more optical pulses with different center wavelength.

Description

technical field [0001] The invention relates to the technical field of laser passive mode-locking, in particular to a passive mode-locked pulse laser that simultaneously outputs two or more light pulses of different wavelengths. Background technique [0002] Multi-wavelength pulsed lasers can simultaneously output optical pulses of two wavelengths, so they can be used in optical fiber sensing, wavelength division multiplexing systems, optical device measurement and optical signal processing, etc. So far, whether the multi-wavelength mode-locked lasers reported internationally are active mode-locked or passively mode-locked, they all achieve multi-pulse output by adding filtering devices with multiple transmission peaks in the optical resonator. [0003] Yao Jianping of Nanyang Technological University realized an active mode-locked multi-wavelength fiber laser by adding a sampling fiber Bragg grating to the optical resonator. [0004] Lou Caiyun from Tsinghua University use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/098H01S3/00H01S3/091H01S3/08H01S5/065H01S5/10
Inventor 刘磊郑铮赵欣刘娅
Owner BEIHANG UNIV
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