Double-side pump device for large-mode-field square clad optical fibers
A side-pumped, large-mode-field technology, which is applied to cladding optical fibers, lasers, optical waveguides, etc., can solve the problems of high manufacturing difficulty, uneven pumping light, and low utilization rate of light energy, so as to improve utilization Efficiency, uniform distribution of pump light intensity, effective and convenient effect of side pumping technology
Inactive Publication Date: 2014-06-18
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
However, they are generally complicated in technology and difficult to make.
Some people directly use the laser diode line array to focus on the surface of the fiber through the lens to pump, but the pump light generated by this method is not uniform in the fiber axis, and the light energy utilization rate is not high.
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[0019] The large mode field square clad optical fiber double-sided pumping device proposed by the present invention is as follows: figure 1 , figure 2 , image 3 and Figure 4 shown.
[0020] figure 1 Schematic diagram of a square-clad fiber with a large mode field. The outer contour of the cladding 7 is square, the inner contour is circular, and the core (6) is circular. For simplicity of description, it is assumed that the eight end points of the square-clad fiber are A, B, C, D, E, F, G, and H respectively; the ABCD plane and the BCFG plane are set as the pump light incident plane, the AEHD plane and the EFGH plane Coated with total reflection film.
[0021] figure 2 It is a schematic diagram of the laser diode array 2 and the fiber bundle array 4 and the coupling module 3 thereof. Select the fiber with the same or similar diameter as the core of the fiber to be pumped to form the fiber bundle array 4 . The laser diode array 2 shapes and couples the beam into th...
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The invention aims to provide a double-side pump device for large-mode-field square clad optical fibers. Laser emitted by each diode in a laser diode array enter an optical fiber bundle array in a coupled manner, light emergent from the optical fiber bundle array is completely incident onto a fiber core of an optical fiber to be pumped through plane sides of a square cladding, and accordingly utilization rate of light energy is increased. Since the optical fibers are arrayed seamlessly and closely, pump light intensity is distributed uniformly in the axial direction of the optical fiber to be pumped; by the aid of the double-side pump technology, the pump intensity is enhanced while the pump light intensity born by the fiber core is more uniform; reflective films are coated on two sides of the square optical fiber so as to increase utilization rate of pump light; and the device is more convenient by the aid of the mature laser diode array and the coupling technology thereof. The device double-side pump device for the large-mode-field square clad optical fibers can be well applied to high-power optical fiber lasers and provides an efficient and convenient side pump technology for the high-power optical fiber lasers.
Description
technical field [0001] The invention relates to a large mode field square-clad optical fiber double-side pumping device, which belongs to the technical fields of optical communication, optical devices and optical information processing. Background technique [0002] Pumping technology is the core technology in the development of laser science, and pumping technology directly affects the performance of laser output. With the rapid development of laser technology, lasers are also developing in the direction of diversification such as solid-state lasers, gas lasers, liquid lasers, semiconductor lasers, and fiber lasers. Different lasers also have different requirements for pumping technology, so laser pumping technology has always been It is a research hotspot in the field of science. The pump light sources currently used are mainly flash lamps, incandescent lamps, light-emitting diodes, and laser diodes. There are three types of pumping methods: single-end pumping, double-en...
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IPC IPC(8): H01S3/094H01S3/067G02B6/02
Inventor 韦玮沈骁
Owner NANJING UNIV OF POSTS & TELECOMM