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Tunable ultra-short pulse laser based on annular cavity

An ultra-short pulse and pulse laser technology, applied in the laser field, can solve the problems of inability to realize multiple pulse tuning, and achieve the effect of simple structure, adjustable pulse number, and adjustable repetition frequency

Active Publication Date: 2019-06-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the mode-locking technology cannot realize the tuning function of multiple pulses.

Method used

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  • Tunable ultra-short pulse laser based on annular cavity

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Embodiment Construction

[0020] The invention provides a tunable ultrashort pulse laser based on a ring cavity, and its working principle is as follows figure 1 shown.

[0021] The device includes a seed laser 1 , a seed laser switching power supply 2 , a 2×2 coupler 3 , an acousto-optic frequency shifter 4 , a fiber amplifier 5 , a fiber delayer 6 , a photodetector 7 and an oscilloscope 8 .

[0022] In this embodiment, the 2×2 coupler 3 has four ports, which are divided into two input terminals and two output terminals, the seed laser 1 is connected to one input terminal of the 2×2 coupler 3, and the photodetector 7 is connected to the 2× One output end of the 2 coupler 3, the other input end and the other output end of the 2×2 coupler 3 are connected through an optical fiber to form a loop feedback cavity. In the loop feedback cavity, an acousto-optic frequency shifter 4 , a fiber amplifier 5 and a fiber delay 6 are connected. The positions of the acousto-optic frequency shifter 4, the fiber ampli...

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Abstract

The invention discloses a tunable ultra-short pulse laser based on an annular cavity. A seed laser is connected with one input end of a coupler, a photoelectric detector is connected with one output end of the coupler, and the other input end and the other output end of the coupler are connected through an optical fiber to form an annular feedback cavity. The acousto-optic frequency shifter, the optical fiber amplifier and the optical fiber delayer are connected in the annular feedback cavity. A seed laser switching power supply controls the on and off of the seed laser. During working, the seed laser switching power supply is started firstly, and the coupler outputs continuous light; when pulse laser needs to be generated, the seed laser switching power supply is turned off, and the coupler outputs the pulse laser. The laser is simple in structure and low in cost, and the system has multiple pulse tuning functions of a single device.

Description

technical field [0001] The invention belongs to the field of laser technology, in particular to a tunable ultrashort pulse laser based on a ring cavity. Background technique [0002] Ultrashort pulse laser is a widely used laser, and its main feature is that the peak power of the output laser is very high and the pulse width is very narrow (usually in the order of picoseconds and femtoseconds). At present, the main technologies capable of generating ultrashort pulse lasers include mode-locked laser technology, gain-switched semiconductor laser technology, and laser intensity modulation technology. Among them, mode-locked laser technology is the most common method to obtain ultrashort pulse laser output. There are many ways to achieve mode-locked, but generally can be divided into two categories: active mode-locked and passive mode-locked. Active mode-locking refers to periodically changing the gain or loss of the laser to achieve the purpose of mode-locking by providing a m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/00H01S3/067H01S3/083H01S3/102H01S3/11G02F1/125
Inventor 张海洋杨宏志赵长明张子龙
Owner BEIJING INSTITUTE OF TECHNOLOGYGY