780 nm high-power optical-fiber femtosecond laser device

A technology of femtosecond lasers and lasers, applied in the direction of lasers, laser components, phonon exciters, etc., can solve the problems of reducing the quality and difficulty of pulse compression, and achieve the reduction of nonlinear effects, reduction of welding and coupling losses, and high quality The effect of pulse compression on

Inactive Publication Date: 2015-01-14
SHANGHAI LANGYAN OPTOELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, it is difficult for the separate pulse amplifier to amplify ultrashort pulses, especially for pulses whose conversion limit is below 100 fs.
The high-order dispersion accumulation and high-order nonlinear accumulation of ultrashort pulses in optical fibers and optical fiber devices seriously reduce the compression quality of pulses

Method used

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  • 780 nm high-power optical-fiber femtosecond laser device
  • 780 nm high-power optical-fiber femtosecond laser device
  • 780 nm high-power optical-fiber femtosecond laser device

Examples

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Effect test

Embodiment 1

[0039] refer to figure 2 , which is a 780 nm high-power fiber femtosecond laser of the present invention with a positive chirped collinear yttrium avanate and a polarization beam-splitting cube hybrid pulse stretching method.

[0040] The femtosecond pulse output by the erbium-doped fiber laser oscillator stage 100 is stretched to 1 ps by the dispersion compensating fiber 211 whose second-order dispersion is positive at 1560nm, and then the pulse is output by the fiber collimator 212 and passed through a 1560nm spatial optical isolator 213 is used to protect the seed light. The laser passes through a polarization beam splitting cube 221 to obtain linearly polarized laser light. The resulting linearly polarized laser pulses pass through a collinear pulse splitting device 222 based on yttrium aluminate crystals. Since the optical axis of the yttrium vanamate crystal is parallel to the interface, and the included angle with the polarization direction of the incident light is 4...

Embodiment 2

[0042] refer to image 3 , which is a 780 nm high-power fiber-excited second optical device of the present invention with a negative chirped collinear yttrium avanate and a polarization beam-splitting cube hybrid pulse stretching method.

[0043] The femtosecond pulse output by the erbium-doped fiber laser oscillator stage 100 is stretched to 1 ps by the single-mode fiber 211 whose second-order dispersion is negative at 1560nm, and then the pulse is output by the fiber collimator 212 and passed through a 1560nm spatial optical isolator 213 is used to protect the seed light. The laser passes through a polarization beam splitting cube 221 to obtain linearly polarized laser light. The resulting linearly polarized laser pulses are separated 222 by collinear pulses based on yttrium aluminate crystals. Since the optical axis of the yttrium aluminate crystal is parallel to the interface, and the angle with the polarization direction of the incident light is 45°, each pulse is s...

Embodiment 3

[0045] refer to Figure 4 , which is a 780 nm high-power fiber femtosecond laser of the present invention with a positive chirped non-collinear yttrium avanate and a polarization beam-splitting cube hybrid pulse stretching method.

[0046] The femtosecond pulse output by the erbium-doped fiber laser oscillator stage 100 is stretched to 1 ps by the dispersion compensating fiber 211 whose second-order dispersion is positive at 1560nm, and then the pulse is output by the fiber collimator 212 and passed through a 1560nm spatial optical isolator 213 is used to protect the seed light. The laser passes through a polarization beam splitting cube 221 to obtain linearly polarized laser light. The resulting linearly polarized laser pulses are separated 222 by collinear pulses based on yttrium aluminate crystals. Since the optical axis of the yttrium aluminate crystal is parallel to the interface, and the angle between the interface and the interface is 45°, each pulse is separated ...

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Abstract

The invention discloses a 780 nm high-power optical-fiber femtosecond laser device. The laser device comprises a laser device seed source, a laser spreading and amplifying module, a laser compression module and a laser frequency doubling module, the laser device seed source and the preceding modules are sequentially connected, the laser spreading and amplifying module is composed of a chirped pulse spreading sub module, a pulse separation sub module and an optical fiber amplifying sub module, and the laser device seed source and the modules all work at the waveband of 1560 nm. A mixed pulse spreading mode is adopted, pulses are spread from 100 fs to 1ns in a small work space, the amplified pulses are compressed to below 100 fs through non-linear compression of a single-mode fiber, and ultimately the pulses reach 780 nm after frequency doubling of non-linear crystals. The laser device has the advantages of being high in stability, simple in structure, small and ingenious in size, low in cost and the like.

Description

technical field [0001] The invention relates to the technical field of high-energy lasers, in particular to a 780nm high-power fiber laser. Background technique [0002] The 780nm femtosecond laser source is used for supercontinuum spectrum generation, optical microscopic imaging, excited terahertz generation, pump-probe ultrafast process research, nonlinear laser spectroscopy, femtosecond micro-nano fine processing, ultrafast dynamics detection of materials, etc. Ideal light source. [0003] The 780nm femtosecond pulse light source is traditionally mainly provided by Ti:Sapphire laser. However, Ti:Sapphire lasers are bulky and expensive, and are mainly used in laboratory environments. And because the Ti:Sapphire laser loses mode-locking, professionals are required to adjust the mode-locking. In addition, various precision optical components used in Ti:sapphire lasers require an environment with constant humidity, and the stability of the laser resonator also requires cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/10H01S3/13G02F1/35
Inventor 曾和平郝强茹启田
Owner SHANGHAI LANGYAN OPTOELECTRONICS TECH
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