Single-mode optical fiber coupling structure of multi-transverse mode laser
A single-mode fiber, coupling structure technology, applied in the laser field, can solve problems such as low efficiency, and achieve the effect of improving coupling efficiency
Inactive Publication Date: 2015-07-01
SHANGHAI BRANCH FUZHOU GAOYI COMM CO LTD
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Problems solved by technology
[0005] Under normal circumstances, the coupling efficiency of multimode LD to single-mode fiber is very low. For example, for 1*100μm?? about 980nmLD, its coupling efficiency is about 3% to 5%. The NA of single-mode fiber is almost the same at 2.6 μm, while the direction of 1 μm is the fundamental mode
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[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0026] The single-mode fiber coupling structure of the multi-transverse-mode laser of the present invention divides the multi-transverse-mode laser spot along its multi-transverse-mode direction into a plurality of beam units having the same diameter and direction angle product as the single-transverse-mode laser, and then divides each beam The units are respectively coupled into the single-mode coupling fiber, so that the sum of the total output laser light of such a group of single-mode coupling fibers can be greatly increased, and the overall coupling efficiency of the single-mode coupling fiber is also greatly improved. Specifically, the coupling structure includes a collimation unit, a focusing unit and a multi-fiber coupling array sequentially arranged behind the multi-transverse-mode laser source. Among them, the multi-fiber coupling arr...
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The invention relates to the technical field of laser, and discloses a single-mode optical fiber coupling structure of multi-transverse mode laser. The single-mode optical fiber coupling structure comprises an alignment unit, a focusing unit and a multi-optical fiber coupling array which are sequentially arranged behind a multi-transverse mode laser source; the multi-optical fiber coupling array comprises a plurality of single-mode coupling optical fibers, and the input end of each single-mode coupling optical fiber is tightly arranged along the multi-transverse mode direction of multi-transverse mode laser spots. The coupling structure disclosed by the invention divides the multi-transverse mode laser spots into a plurality of light beam units, which have the same diameter and the same direction angle multiplication as single-transverse mode laser, along the multi-transverse mode direction thereof, and the multi-transverse mode laser spots are outputted through the other end of each single-mode coupling optical fiber, so that the sum of total laser outputted by one group of single-mode coupling optical fibers can be greatly improved, and the total coupling efficiency of the single-mode coupling optical fibers is also greatly improved.
Description
technical field [0001] The invention relates to the field of laser technology, in particular to a single-mode fiber coupling structure and a coupling method for multi-transverse mode lasers. Background technique [0002] In semiconductor lasers, the output power of a single transverse mode chip is usually between a few milliwatts and tens of thousands of milliwatts, and it is difficult to obtain higher output power in a single tube. [0003] The efficiency of coupling a single-mode semiconductor laser to a single-mode fiber is naturally high, but due to power limitations, the power obtained by coupling into the single-mode fiber seems to be very limited. For example, as a pump light, the 980nm power is mostly 200mw~600mw, and the price is very high. expensive. [0004] On the other hand, multimode semiconductor lasers are usually easy to obtain 1W, 2W output, and now they can reach 10W, and some single tubes may reach hundreds of watts. They usually have a luminous point of...
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IPC IPC(8): G02B6/42
Inventor 吴砺贺坤柏天国林磊
Owner SHANGHAI BRANCH FUZHOU GAOYI COMM CO LTD