Simple, high performance, tunable Q adjusted laser of doubly coated fiber

A double-clad optical fiber and laser technology, which is applied in the direction of lasers, laser components, phonon exciters, etc., can solve the problems of increasing the complexity of the resonator, the difficulty of adjustment, low output efficiency, and large insertion loss, so as to avoid Effects of insertion loss, improved stability, and damage prevention

Inactive Publication Date: 2006-12-06
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

Although the spatial grating has a large tuning range and narrow line width, it increases the complexity and difficulty of adjustment of the resonator, and the insertion loss is very large, because the diffraction efficiency of a single reflective grating is 20%-40%, and most of the laser energy is absorbed loss, so the output efficiency is relatively low

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  • Simple, high performance, tunable Q adjusted laser of doubly coated fiber
  • Simple, high performance, tunable Q adjusted laser of doubly coated fiber

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Embodiment Construction

[0016] Please see first figure 1 and figure 2 , figure 1 It is a schematic diagram of a simple, high-efficiency, tunable Q-switched double-clad fiber laser of the present invention, figure 2 It is a schematic diagram of the fiber grating adjusting device of the present invention. As can be seen from the figure, the simple, high-efficiency, tunable Q-switched double-clad fiber laser of the present invention is characterized in that it includes a double-clad fiber with an outer clad 2, an inner clad 3 and a core 4, and at one end of the double-clad fiber The fiber core 4 is engraved with a fiber grating 9, and outside the fiber grating 9 is a fiber grating adjusting device 10, and a cavity mirror 1 is arranged outside the other end of the double-clad fiber. There is a V-shaped notch on the middle side of the optical fiber and a V-shaped notch pumping system 5 is aligned with the V-shaped notch. The V-shaped notch pumping system 5 is composed of a laser diode pumping source ...

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Abstract

The doubly coated fiber includes outer cladding, inner cladding, and fiber core. Grating of optical fiber is graved on one end of the fiber. Adjusting unit for the grating is positioned outside the grating. Lens of resonant cavity is located at the other end of the fiber. A V-type notch is made at side face at middle part of the fiber, and a V-type notch pump system is aimed at the V-type notch. The pump system is composed of diode pump source, lens set, and transparent substrate arranged from outer to fiber core. The adjusting unit includes a portion of plastic sleeve sheathed on the grating skin to skin. The plastic sleeve is griped between base of arc chute and metal spring piece in toughness, and fixed by bolts sheathed in springs. Features are: compact structure, flexible, easy of turning, small insertion loss, and great increased efficiency of outputting layer.

Description

technical field [0001] The invention relates to a short-pulse passive Q-switched double-clad fiber laser, especially a double-clad fiber laser with tunable, narrow line width, several nanosecond pulse width and high peak power. technical background [0002] Tunable narrow linewidth, short pulse, high peak power lasers have very important applications in the fields of laser ranging, material processing, communication, remote sensing, and national defense engineering. The prior art uses a laser diode (LD) pulse to end-pump a double-clad fiber laser, which outputs nanosecond-level laser pulses with a linewidth of 1.6nm and a central wavelength of 1098nm. Referring to the literature [Electron.Lett.15:652-654, 2003], the use of pulsed end-face pumping may cause damage to the end-face of the optical fiber pump. The literature does not control the spectrum of the output laser, it is not tunable, and the spectrum stability is relatively poor. Because with the long-term continuous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/0941H01S3/08H01S3/16H01S3/10
Inventor 楼祺洪赵宏明周军董景星魏运荣
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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