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All-fiber laser system and method for generating high-energy rectangular pulse

A rectangular pulse and laser system technology, applied in the laser field, can solve problems such as the difficulty of directly outputting high-energy rectangular laser pulses, and achieve the effects of convenient and fast operation, good heat dissipation, and reduced system costs

Inactive Publication Date: 2019-03-19
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that it is difficult to directly output high-energy rectangular laser pulses in existing fiber lasers, and propose an all-fiber laser system and method for generating high-energy rectangular pulses

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  • All-fiber laser system and method for generating high-energy rectangular pulse

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Embodiment Construction

[0031] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0032] The present invention provides an all-fiber laser system that generates high-energy rectangular pulses, such as figure 1 As shown, it includes sequentially connected passive mode-locked fiber laser 1, isolator 2, fiber amplifier 3, first common single-mode fiber 4, highly nonlinear fiber 5, programmable optical filter 6 and second common single-mode fiber 7 .

[0033] In the embodiment of the present invention, the passive mode-locked fiber laser 1 is an erbium-doped mode-locked fiber laser operating in the net positive dispersion region, and the output is a dissipative soliton pulse, whose pulse time domain shape is Gaussian, and the corresponding spectral shape is approximately rectangular , the central wavelength λ of the output pulse is: 1550nm, and the output pulse repetition frequency is in the order of MHz.

[0034] The isolator 2 is a po...

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Abstract

The invention discloses an all-fiber laser system and method for generating a high-energy rectangular pulse, and aims to solve the technical problem that it is difficult for an existing fiber laser todirectly output a high-energy rectangular laser pulse. The system comprises a passive mode-locked fiber laser (1), an isolator (2), a fiber amplifier (3), a first common single-mode fiber (4), a highly nonlinear fiber (5), a programmable optical filter (6) and a second common single-mode fiber (7) which are successively connected. The all-fiber laser system is simple and compact in structure andgood in stability. A high-energy rectangular laser pulse output with an adjustable pulse width can be realized by adjusting the pumping power of the fiber amplifier (3) and the filtering bandwidth ofthe programmable optical filter (6), thereby greatly reducing system cost. The system can be used directly as a picosecond and nanosecond rectangular pulse source, or as a seed source for high-energypulse amplifiers.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to the design of an all-fiber laser system and method for generating high-energy rectangular pulses. Background technique [0002] High energy ultrashort pulse fiber lasers are widely used in optical communication, optical sensing, precision machining, biomedicine, national defense and military, etc. Generally, mode-locking technology is used to obtain ultra-short pulses. Mode-locking technology is mainly divided into two types: active mode-locking and passive mode-locking. Compared with active mode-locking, passive mode-locking technology is a research hotspot in the laser field because it does not require additional modulators, has the advantages of simple and compact structure, and is easy to realize all-fiber. [0003] Passive mode-locking technology uses the nonlinear loss characteristics of saturable absorbers to achieve mode-locking. The basic principle is to use...

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Application Information

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IPC IPC(8): H01S3/067H01S3/106H01S3/108H01S3/11H01S3/098
CPCH01S3/06725H01S3/06754H01S3/106H01S3/108H01S3/1112
Inventor 王壮李和平杜文雄李俊文张旨遥刘永
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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