Active Q-switched full-optical-fiber laser

A laser and all-fiber technology, which is applied in the field of active Q-switched all-fiber lasers, can solve the problems of large insertion loss and difficult full-fiberization, and achieve the effect of low insertion loss and simple structure

Inactive Publication Date: 2007-11-14
TIANJIN UNIV
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  • Summary
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  • Application Information

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Problems solved by technology

Acousto-optic Q-switches have been widely used in Q-switched solid-state lasers, but as switching devices in fib

Method used

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  • Active Q-switched full-optical-fiber laser

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Embodiment 1

[0017] Accompanying drawing 1 is the structural diagram of implementing the Q-switched all-fiber laser involved in the present invention in the form of a ring cavity. In Fig. 1, the pumping semiconductor laser 101 is a 980nm semiconductor laser with a single-mode pigtail output, and the maximum output power is 120mW. The wavelength division multiplexer 102 is a 980nm / 1060nm wavelength division multiplexer. The gain fiber 103 is a highly doped ytterbium (Yb) fiber produced by Liekki Company. The core has an absorption coefficient of 1200 dB / m for 976 nm light, a core diameter of 6 microns, a cladding diameter of 125 microns, and a numerical aperture of 0.2. A sufficiently high doping concentration makes it possible to shorten the cavity length of the laser. Experiments have proved that a length of 30 cm can completely absorb the pump light and generate sufficient gain. The function of the fiber isolator 104 is to make the light in the ring cavity transmit in one direction alon...

Embodiment 2

[0019] Accompanying drawing 2 is the device diagram of implementing the Q-switched all-fiber laser involved in the present invention in the form of a linear cavity. The fiber grating 201 has a high reflectivity close to 100% for light near 1060nm, and the fiber grating 202 is an output grating with a reflectivity in the range of 5%-80%. The 980nm pumping light provided by the pumping semiconductor laser 101 passes through the fiber grating 201 to the gain fiber 103, and excites it to generate population inversion and gain to light near 1060nm. The function and working process of the variable fiber attenuator 105 are similar to the above-mentioned ring cavity laser. Different from the ring cavity laser, the fiber gratings 201 and 202 play a role in selecting the wavelength, so the bandwidth of the output pulsed laser can be compressed.

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Abstract

This invention discloses a initiative full-Q-switched fiber laser. Ring-wide initiative Q-switched fiber laser, including pumped semiconductor lasers, wavelength division multiplexing, gain fiber, optical fiber isolators, optical fiber coupler and output fiber, optical attenuator and optical isolators in optical fiber coupler and set between the variable its driver, variable optical attenuator from electro-optic material, magneto-optical materials, or micro-electro-mechanical systems pose. Active Q-switching linear cavity all-fiber laser, including pumped semiconductor laser, high reflectivity Fiber Bragg Grating, gain fiber, low reflectivity Fiber Bragg grating, in the gain fiber and low reflectivity between Fiber Bragg Grating set up and variable optical attenuator driver source, variable optical attenuator from electro-optic material, magneto-optical materials, or micro-electro-mechanical systems pose. The advantages of the present invention is that the whole initiative Q-switched fiber laser used as a variable optical attenuator Q-switched laser device, the structure is simple and easy to implement.

Description

technical field [0001] The invention relates to an optical fiber laser, in particular to an active Q-switched all-fiber laser, which belongs to the technical field of optical fiber and laser. Background technique [0002] The fiber laser uses the fiber doped with rare earth elements as the gain medium. Under the action of the pump light, a high power density is formed in the fiber, which causes the particle number inversion of the energy level of the gain medium. Under certain optical feedback conditions, in Laser oscillation is formed in the fiber to generate laser output. Compared with other lasers, fiber lasers have remarkable characteristics such as low laser working threshold, high energy conversion efficiency, good output beam quality, compact and stable structure, no need for optical path adjustment, good heat dissipation, long life and no maintenance, etc., so they have been rapidly developed and recognized. more and more widely used. At present, the continuous out...

Claims

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Application Information

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IPC IPC(8): H01S3/00H01S3/11H01S3/067H01S3/08H01S3/0941
Inventor 李恩邦吕福云郭文刚
Owner TIANJIN UNIV
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