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Gain switch laser adopting thulium-doped fiber laser for pumping

A fiber laser, gain switch technology, applied in lasers, laser parts, phonon exciters, etc., can solve problems such as inferiority and inconvenience in application, and achieve the effect of reducing threshold energy, stable time-domain state, and strong scalability

Pending Publication Date: 2019-04-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, due to the "two-to-one" cross-relaxation process, the output pulse of the 800nm ​​pump is not as regular as the output pulse of the 1550nm wavelength pump in the time domain, which brings inconvenience to the application.

Method used

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  • Gain switch laser adopting thulium-doped fiber laser for pumping
  • Gain switch laser adopting thulium-doped fiber laser for pumping
  • Gain switch laser adopting thulium-doped fiber laser for pumping

Examples

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Embodiment 1

[0026] like figure 1 As shown, the embodiment of the present invention discloses a gain-switched laser pumped by a thulium-doped fiber laser, comprising sequentially connected 2, a bias T-shaped circuit driver 3, a nanopulse pump source 4, and a first fiber isolator 10 , the output end of the first fiber isolator 10 is connected to the first input end of the fiber combiner 14, the output end of the fiber combiner 14, the first fiber Bragg grating 15, the gain fiber 18 and the second fiber Bragg grating 16 in sequence connection, the second input end of the fiber combiner 14 is connected with the first semiconductor laser 12, the output end of the second fiber Bragg grating 16 outputs the optical fiber to the Cr:ZnSe / S crystal 23, and finally outputs laser light. The first fiber Bragg grating 15, the gain fiber 18 and the second fiber Bragg grating 16 constitute a first laser resonant cavity.

[0027] The working principle of the gain-switched laser pumped by the thulium-doped...

Embodiment 2

[0030] In the present embodiment, it differs from Embodiment 1 in that the computer 1LabVIEW program controls the pulse generator 2 to generate the set pulse waveform, and the third input end of the fiber combiner 14 is connected with the second semiconductor laser 13, and the nanopulse A second optical fiber isolator 5, a wavelength division multiplexer 8 and an erbium-doped optical fiber / erbium-ytterbium co-doped optical fiber 9 connected in sequence between the pumping source 4 and the first optical fiber isolator 10, the wavelength division multiplexer 8 The first input end is connected to the output end of the second optical fiber isolator 5, and the second input end and the third input end of the wavelength division multiplexer 8 are respectively connected to the third semiconductor laser 6 and the fourth semiconductor laser 7. Between the second fiber Bragg grating 16 and the Cr:ZnSe / S crystal 23, a pumping stripper 19, a collimating isolator 20, a focusing lens 21 and a...

Embodiment 3

[0033] The difference between the gain switch laser pumped by the thulium-doped fiber laser in this embodiment and the second embodiment is that the upper ends of the first cavity mirror 22a and the second cavity mirror 22b are all towards the direction close to the Cr:ZnSe / S crystal 23 Oblique setting, a grating 24 and an output coupler 25 are provided below the Cr:ZnSe / S crystal 23, so that the laser light passes through the focusing lens 21, the first cavity mirror 22a, the Cr:ZnSe / S After the crystal 23 and the second cavity mirror 22b, a part of the laser light is reflected from the second cavity mirror 22b to the grating 24, and after passing through the grating 24 and reflected back to the second cavity mirror 22b, the laser light is finally output through the output coupler 25. In this embodiment, the first cavity mirror 22a, the Cr:ZnSe / S crystal 23, the second cavity mirror 22b, the grating 24 and the output coupler (OC) 25 constitute a Cr:ZnSe / S laser resonator with ...

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Abstract

The invention discloses a gain switch laser adopting thulium-doped fiber laser for pumping. The gain switch laser comprises a pulse generator, a bias T-shaped circuit drive, a nano-pulse pumping source and a first fiber isolator which are connected in sequence; the output end of the first fiber isolator is connected with the first input end of a fiber beam combiner; the output end of the fiber beam combiner, a first fiber Bragg grating, a gain fiber and a second fiber Bragg grating are sequentially connected, the second input end of the fiber beam combiner is connected with a first semiconductor laser, the output end of the second fiber Bragg grating outputs a fiber to a Cr:ZnSe / S crystal, and laser light is output finally. According to the gain switch laser, the Cr:ZnSe / S crystal is pumped through 1908 nanometer short wavelength laser light of a mixed pumping gain switch technology, threshold energy of pumping pulse light is lowered, and the time domain state of the output 2-micron laser light is more stable than 2-micron laser light generated through a Q-switching and mode-locking technology.

Description

technical field [0001] The invention belongs to the technical field of gain switch lasers, in particular to a gain switch laser pumped by a thulium-doped fiber laser. Background technique [0002] Currently, lasers operating in the eye-safe band of 2 microns are of great interest in scientific research and industrial applications, such as in sensing, spectroscopy, material processing applications, and nonlinear frequency conversion. The 2 micron band has abundant molecular absorption lines, and laser sources matching this absorption wavelength are very useful for atmospheric lidar sensing and medical and surgical applications. The 1908nm laser is an important branch of the 1.9 micron laser, because the 1908nm laser can generate 2 micron laser by pumping Cr:ZnSe / S, Ho:YAG and other nonlinear crystals. Then, the 2-micron laser can produce 3-micron to 5-micron lasing by pumping the ZGP crystal. Mid-infrared lasers from 3 microns to 5 microns are widely used in electro-optical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/094H01S3/0941
CPCH01S3/094042H01S3/094076H01S3/094096H01S3/0941
Inventor 王璞刘鹰卜祥宝
Owner BEIJING UNIV OF TECH
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