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2.9-micron intermediate infrared mode-locked laser

A technology of mode-locked lasers and Raman lasers, which is applied to lasers, laser components, phonon exciters, etc., can solve the problems of large modulation depth, narrow modulation bandwidth, and increased difficulty in stable mode-locking, achieving simple preparation, low cost effect

Inactive Publication Date: 2019-03-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the semiconductor saturable absorbing mirror (SESAM) currently used for mode-locking in this band still has many problems, such as narrow modulation bandwidth and large modulation depth, etc., which also greatly increases the difficulty of achieving stable mode-locking in the 2.9 micron band

Method used

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  • 2.9-micron intermediate infrared mode-locked laser
  • 2.9-micron intermediate infrared mode-locked laser
  • 2.9-micron intermediate infrared mode-locked laser

Examples

Experimental program
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Embodiment 1

[0031] A 2.9 µm mid-infrared mode-locked laser, such as figure 1 As shown, including 1150nm fiber Raman laser 1, collimation focusing system 2, laser input mirror 3, laser crystal 4, laser mirror A5, laser mirror B6, laser output mirror 7 and mode-locking components, 1150nm fiber Raman laser 1 can be linearly polarized;

[0032] The pump light output by the 1150nm fiber Raman laser 1 passes through the collimation and focusing system 2, the laser input mirror 3, and then enters the laser crystal 4, the laser input mirror 3, the laser crystal 4, the laser mirror A5, the laser mirror B6, The laser output mirror 7 and the mode-locking element constitute a laser resonator, and the generated mode-locked laser is coupled and output by the laser output mirror 7;

[0033] The laser crystal 4 is double-doped holmium and praseodymium lutetium lithium fluoride (Ho, Pr:LLF), and the mode-locking element is graphene or black phosphorus saturable absorber.

[0034] The 1150nm pumping ligh...

Embodiment 2

[0036] A 2.9 micron mid-infrared mode-locked laser, the structure is as shown in embodiment 1, the difference is, as figure 2 As shown, it also includes a pair of prisms (prism 9 and prism 10). The oscillating beam in the laser cavity is compensated for dispersion after passing through two prisms 9 and 10. This embodiment 2 compensates for the dispersion in the cavity and can generate femtosecond Order of magnitude mode-locked laser output.

Embodiment 3

[0038] A 2.9 micron mid-infrared mode-locked laser, the structure is as shown in embodiment 1, the difference is, as image 3 As shown, it also includes chirped mirrors 11 and 12. The oscillating beam in the laser cavity undergoes dispersion compensation after passing through the two chirped mirrors 11 and 12. This embodiment compensates for intracavity dispersion and can generate femtosecond-level Mode-locked laser output.

[0039] of the present invention Figure 4 It is the pulse sequence diagram of Embodiment 1 of the present invention, and the time scale is 200 μs / div. It can be seen from the figure that the present invention has achieved relatively stable continuous mode-locking;

[0040] Figure 5 It is the signal-to-noise ratio figure of Embodiment 1 of the present invention, as can be seen from the figure, the signal-to-noise ratio of the mode-locked laser can reach 58dB;

[0041] Image 6 It is the spectrogram of Example 1 of the present invention, and it can be ...

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Abstract

The invention relates to a 2.9-micron intermediate infrared mode-locked laser, and belongs to the field of the full-solid-state intermediate infrared laser. The 2.9-micron intermediate infrared mode-locked laser comprises a 150nm optical fiber Raman laser, a collimation focusing system, a laser input mirror, a laser crystal, a laser reflector module, a laser output mirror and a mode-locked element; the pump light output by the 1150nm optical fiber Raman laser is irradiated to the laser crystal after passing through the collimation focusing system and the laser input mirror in order; the laserinput mirror, the laser crystal, the laser reflector module, the laser output mirror and the mode-locked element form a laser resonant cavity, the produced mode-locked laser is output in a coupling bythe laser output mirror; the laser crystal is holmium-praseodymium double-doped, the mode-locked element is graphene or black phosphorous saturable absorber. By adopting the 1150-nm laser pumping holmium-praseodymium double-doped laser crystal, the novel two-dimensional material graphene or black phosphorous are used as the saturable absorber to successfully realize high-efficiency high-beam quality 2.9-micron band mode-locked intermediate infrared laser output.

Description

technical field [0001] The invention relates to a 2.9 micron (μm) mid-infrared mode-locked laser, belonging to the technical field of all-solid-state mid-infrared lasers. Background technique [0002] Picosecond (ps) or femtosecond (fs) level ultrashort pulse laser has the characteristics of extremely narrow pulse width, extremely wide spectral range, ultra-high peak power, and extremely high repetition rate. It is used in scientific research, ultrafast spectroscopy , medicine, metrology, quantum coherent control, micromachining and other fields have been widely used. The research of ultra-short pulse laser has important value and far-reaching significance to the development of science and society. The exploration of new ultrashort pulse light source has become an important research field in today's science and technology. All-solid-state laser mode-locking technology is the main technical means to obtain picosecond and femtosecond laser pulses. Thanks to the development o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/16H01S3/098H01S3/081H01S3/067H01S3/30
CPCH01S3/161H01S3/067H01S3/0815H01S3/1118H01S3/1613H01S3/302
Inventor 张百涛聂鸿坤施炳楠杨克建何京良
Owner SHANDONG UNIV
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