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Device for generating femtosecond laser pulse signals based on lead sulfide, and laser device

A pulsed signal, femtosecond laser technology, applied in the field of lasers, can solve the problems of dyes with toxicity, frequent replacement, easy deterioration, etc., to achieve the effects of low cost, output requirements, and stable output signals

Active Publication Date: 2020-08-21
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In traditional lasers, researchers use dyes to make saturable absorbers, but dyes have disadvantages such as toxicity, perishability, short life, and frequent replacement, which have been gradually eliminated.

Method used

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  • Device for generating femtosecond laser pulse signals based on lead sulfide, and laser device
  • Device for generating femtosecond laser pulse signals based on lead sulfide, and laser device
  • Device for generating femtosecond laser pulse signals based on lead sulfide, and laser device

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Experimental program
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Effect test

Embodiment 1

[0044] as attached figure 1 As shown, the present invention discloses a device for generating femtosecond laser pulse signals based on lead sulfide, including a saturable absorbing device 6 and a polarization controller 5 and a fiber coupler 7 respectively fixed at both ends of the saturable absorbing device 6, The saturable absorber 6 includes an optical fiber jumper and a saturable absorber 9 transferred to the optical fiber jumper by a dry transfer method, and the saturable absorber 9 is made of lead sulfide; the optical fiber jumper Including a housing 61, an input optical fiber 62 and an output optical fiber 63 arranged on the housing 61 and a connector arranged between the input optical fiber 62 and the output optical fiber 63, the input optical fiber 62 is connected to the polarization control The output end of the device 5, the output fiber 63 is connected to the input end of the fiber coupler 7; the saturable absorber 9 is arranged on the connector.

[0045] More spe...

Embodiment 2

[0050] as attached Figure 4 As shown, on the basis of Embodiment 1, the present invention also provides a laser for generating femtosecond laser pulse signals based on lead sulfide, including a pump source 1, a wavelength division multiplexer 2, a gain fiber 3, and a polarization-independent isolator 4 , an output signal terminal 8 and the device for generating femtosecond laser pulse signals based on lead sulfide as described in Embodiment 1; the wavelength division multiplexer 2, gain fiber 3, polarization-independent isolator 4, and the femtosecond laser pulse signal generated based on lead sulfide The polarization controller 5 in the device for laser pulse signals, the saturable absorption device 6 in the device for generating femtosecond laser pulse signals based on lead sulfide, and the fiber coupler 7 in the device for generating femtosecond laser pulse signals based on lead sulfide pass through the optical fiber connected in sequence to form a loop; the pump source 1 ...

Embodiment 3

[0055] The present invention also provides a method for preparing the above-mentioned lead sulfide micro-sheets, which are prepared by physical vapor deposition in a tube furnace equipped with a quartz tube 10, such as Figure 8 As shown, it specifically includes the following steps:

[0056] S1, take 0.25g of high-purity lead sulfide powder as a precursor raw material and put it in the quartz boat 11, place the quartz boat 11 loaded with the lead sulfide powder in the middle of the quartz tube 10, and the quartz tube 10 is used as a part of the tube furnace 12, The quartz tube 10 passes through the tube furnace 12 and the middle of the two overlaps or nearly overlaps; the quartz boat 11 carrying the silicon chip is placed in the downstream area of ​​the quartz tube 10, and the silicon chip is used as the substrate for the growth of the lead sulfide microsheet 643;

[0057] S2, before the growth of the lead sulfide microsheet 643, feed high-purity nitrogen into the quartz tube...

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Abstract

The invention discloses a device for generating a femtosecond laser pulse signal based on lead sulfide, and a laser device. The device comprises a saturable absorption device, a polarization controller and an optical fiber coupler, wherein the saturable absorption device comprises an optical fiber wire jumper and a saturable absorption body transferred to the optical fiber wire jumper through a dry transfer method, the saturable absorption body is made of lead sulfide, the optical fiber wire jumper comprises a shell, an input optical fiber, an output optical fiber and a connector, the input optical fiber and the output optical fiber are arranged on the shell, the input optical fiber is connected to the output end of the polarization controller, the output optical fiber is connected to theinput end of the optical fiber coupler, and the saturable absorption body is disposed on the connector. According to the device for generating the femtosecond laser pulse signal based on the lead sulfide, the saturable absorption body is made of lead sulfide, so that the femtosecond laser pulse signal is generated, the device has the advantages of being low in cost, simple in preparation method, simple in device structure, stable in output signal and the like, stable mode locking is achieved, and the device can be suitable for different lasers.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a device and a laser for generating femtosecond laser pulse signals based on lead sulfide. Background technique [0002] Due to the advantages of high data transmission rate, narrow pulse width, high spatial resolution, high bandwidth, and good beam quality, femtosecond laser pulse signals are widely used in many fields such as wireless communication, material processing, and microscopic imaging. [0003] The mode-locking technology in passive Q-switching and passive mode-locked lasers developed initially is a common method for generating femtosecond pulsed lasers. The commonly used mode-locking techniques are divided into two types: Kerr lens mode-locking and passive mode-locking. The principle of Kerr lens mode-locking is that the refractive index of the material will change with the light intensity, so that the gain obtained by the spike pulse in the operation of the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/0933H01S3/11H01S3/10
CPCH01S3/06716H01S3/0933H01S3/10061H01S3/1106H01S3/1115
Inventor 吴坚阚雪芬王涛汪进马阎星马鹏飞粟荣涛姜曼周朴
Owner NAT UNIV OF DEFENSE TECH