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Nanosecond pulse fiber laser with circle structure

A fiber laser, nanosecond pulse technology, applied in the laser field, can solve the problems of pulse train time jitter and amplitude jitter, pulse width and repetition frequency are not adjustable, and no full fiber is realized, so as to achieve small size and reduce jitter problems. , the effect of suppressing the scattering effect

Inactive Publication Date: 2011-10-05
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the existing problems such as non-adjustable pulse width and repetition frequency, large time jitter and amplitude jitter of the pulse train, no full-fiber realization, and poor system stability, the purpose of the present invention is to provide a new technical approach to realize The pulse width and repetition frequency are tunable, the time jitter and amplitude jitter of the pulse train are small, and the system is stable. The passive Q-switched nanosecond pulse fiber laser has the advantages of simple cavity shape, low cost, small size, light weight, good heat dissipation, and full Advantages of fiber optic

Method used

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  • Nanosecond pulse fiber laser with circle structure
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  • Nanosecond pulse fiber laser with circle structure

Examples

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Embodiment 1

[0023] The first nanosecond pulsed fiber laser with ring structure such as figure 1 shown. figure 1 Among them, 1 is the pump source, which uses a semiconductor laser diode with a maximum withstand power of 10W and a center wavelength of 976nm; 2 is a wavelength division multiplexer, a pump light wavelength division multiplexer with a model of (2+1); 3 is a gain fiber , choose 6m long double-clad ytterbium-doped fiber; 4 is the fiber beam splitter, the splitting ratio is 2:8; 5 is the 20% output end of the fiber beam splitter; 6 and 10 are the first glass sleeve and the second Glass casing, the optical fiber is inserted into the glass casing, so that the laser passes through the glass casing; 7 and 9 are the first self-focusing lens and the second self-focusing lens, the intercept Z of the self-focusing lens is 0.5P, and it adopts double-sided coating , the two end faces are at an angle of 8°, the function is to collimate and focus the laser light entering the glass sleeve; 8...

Embodiment 2

[0026] The second ring structure nanosecond pulsed fiber laser such as figure 2 shown. figure 2 Among them, 1 is the pump source, which uses a semiconductor laser diode with a maximum withstand power of 10W and a center wavelength of 976nm; 2 is a wavelength division multiplexer, a pump light wavelength division multiplexer with a model of (2+1); 3 is a gain fiber , choose 6m long double-clad ytterbium-doped optical fiber; 4 is the optical fiber beam splitter, the splitting ratio is 2:8; 5 is the 20% output end of the optical fiber beam splitter; 6 is the first glass sleeve, and the optical fiber is inserted into the glass sleeve , so that the laser passes through the glass sleeve; 7 and 9 are the first self-focusing lens and the second self-focusing lens, the intercept Z of the self-focusing lens is 0.5P, and the double-sided coating is selected, and the angle of both end faces is 8° , the role is to collimate and focus the laser light entering the glass tube; 8 is a Cr:YA...

Embodiment 3

[0029] The third ring structure nanosecond pulsed fiber laser such as image 3 shown. image 3 Among them, 1 is the pump source, which uses a semiconductor laser diode with a maximum withstand power of 10W and a center wavelength of 976nm; 2 is a wavelength division multiplexer, a pump light wavelength division multiplexer with a model of (2+1); 3 is a gain fiber , choose 6m long double-clad ytterbium-doped optical fiber; 4 is the optical fiber beam splitter, the splitting ratio is 2:8; 5 is the 20% output end of the optical fiber beam splitter; 6 is the first glass sleeve, and the optical fiber is inserted into the glass sleeve , make the laser pass through the glass casing; 7 is the first self-focusing lens, the intercept Z of this self-focusing lens=0.5P, select double-sided coating, both end faces are 8° angle, the effect is to enter the glass casing The laser is collimated and focused; 8 is a Cr:YAG saturable absorber, and its diameter Thickness 1 = 2.13mm, transmittan...

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Abstract

The invention relates to a nanosecond pulse fiber laser with a circle structure, belonging to the technical field of lasers. The laser mainly comprises a pumping source (1), a WDM (wavelength division multiplexer) (2), a gain fiber (3), a fiber beam splitter (4), an output end (5) of the fiber beam splitter, a first glass sleeve (6), a first auto-focusing lens (7), a saturable absorber (8), a second auto-focusing lens (9), a second glass sleeve (10), a fiber circulator (11), an FBG (fiber Bragg grating) (12), a reflector (13) and a fiber isolator (14). The glass sleeves, the auto-focusing lenses and the saturable absorber are bonded together to form a miniaturized Q-adjusting component, thus realizing the overall fiber of the fiber laser and reducing the interferences from other external factors. The nanosecond pulse fiber laser has the advantages of small volume, low cost, overall fiber, simple structure, wide application prospects and the like.

Description

technical field [0001] The invention relates to a ring-structured nanosecond pulse fiber laser, which belongs to the technical field of lasers. Background technique [0002] Nanosecond pulsed fiber laser has significant advantages such as good output beam quality, high conversion efficiency, good heat dissipation effect, no need for water cooling system, high reliability, compact shape, easy system integration and other laser sources, and has been widely used in industrial processing (such as: marking, welding, cutting, material surface treatment), laser medical treatment, laser ranging, military and other fields. At present, there are mainly two methods of acousto-optic modulation and semiconductor modulation seed source in the research of nanosecond pulsed fiber laser. Compared with the passive Q-switching method, the above two methods have the disadvantages of complex cavity structure, high cost, large volume, and difficulty in realizing all-fiber. Contents of the inve...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/113H01S3/00
Inventor 王璞刘佳
Owner BEIJING UNIV OF TECH
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