Laser module

A laser module, laser technology, applied in lasers, laser devices, semiconductor lasers, etc., to achieve the effect of improving coupling efficiency

Pending Publication Date: 2020-10-20
THE FUJIKURA CABLE WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when focusing on this coupling efficiency, there is still room for improvement in the coupling efficiency in the conventional laser module 101

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach 〕

[0020] (Structure of laser module)

[0021] refer to figure 1 The configuration of the laser module 1 according to the first embodiment of the present invention will be described. figure 1 It is a perspective view of the laser module 1 .

[0022] Such as figure 1 As shown, the laser module 1 has 7 laser diodes LD 1 ~LD 7 , 7 F-axis collimating lenses FL 1 ~FL 7 , 7 S-axis collimating lenses SL 1 ~SL 7 , 7 mirrors M 1 ~ M 7 , a condenser lens FL and an optical fiber OF. Laser diode LD 1 ~LD 7 , F-axis collimator lens FL 1 ~FL 7 , S-axis collimator lens SL 1 ~SL 7 , Mirror M 1 ~ M 7 And the condenser lens FL is mounted on the bottom plate B of the casing of the laser module 1 . The optical fiber OF penetrates the side wall of the housing of the laser module 1, and will include the incident end face OF I The inner end is guided into the housing of the laser module 1 . In addition, in figure 1 In , the illustration of the side wall of the housing of the l...

no. 1 Embodiment

[0085] refer to Figure 5 A laser module 1 as a first embodiment of the present invention will be described. The laser module 1 of the present embodiment takes figure 1 The shown structure of the laser module 1 is based on an increase in the number of unit optical systems from n=7 to n=13.

[0086] Figure 5 (a) represents the coupling efficiency and collimation length LC in the unit optical system included in the laser module 1 of the present embodiment. i The associated coordinate map of . Figure 5 (b) represents a preferred collimation length LC for each unit optical system included in the laser module 1 of this embodiment. i coordinate diagram.

[0087] Depend on Figure 5 (a) can be seen by making each collimation length LC i (i=1, 3, 7, 10, 13) varies within the range of 9 mm to 10.5 mm, so that each laser LB i The coupling efficiency changes. according to Figure 5 As a result of (a), for each case of i=1, 3, 7, 10, 13, the optimal collimation length LC is o...

no. 2 Embodiment

[0091] refer to Figure 6 A laser module as a second embodiment of the present invention will be described. The laser module 1 of the present embodiment takes Figure 7 Based on the structure of the laser module 101 shown, after increasing the number of unit optical systems from n=7 to n=13, the S-axis collimator lens SL i The curvature r i obtained by change.

[0092] Figure 6 (a) represents the coupling efficiency and curvature r in the unit optical system included in the laser module of this embodiment i The associated coordinate map of . Figure 6 (b) represents the preferred curvature r for each unit optical system included in the laser module 1 of the present embodiment. i coordinate diagram.

[0093] Depend on Figure 6 (a) can be seen: by making each curvature r i (i=1, 3, 7, 10, 13) varies within the range of 6.2 mm to 6.9 mm, so that each laser LB i The coupling efficiency changes. according to Figure 6 As a result of (a), for each case of i=1, 3, 7, 10,...

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Abstract

The objective of the invention is to improve, in a laser module, the efficiency of coupling between the laser light generated by laser diodes and the laser light propagating through an optical fiber.This laser module (1) comprises an optical fiber, n laser diodes LDi, and n collimating lenses SLi. In this laser module (1), the collimation length LC1 corresponding to the laser diode LD1 is offsetfrom a specific distance SL defined with respect to each of the collimating lenses SLi.

Description

technical field [0001] The present invention relates to a laser module including a plurality of laser diodes and optical fibers. Background technique [0002] As an excitation light source for fiber lasers, laser modules equipped with multiple laser diodes and optical fibers are widely used. In such a laser module, laser light output from a plurality of laser diodes is input to an optical fiber. By using such a laser module, it is possible to obtain high-power laser light that cannot be obtained from a single laser diode. As an existing laser module, Figure 7 The shown laser module 101 (see Patent Document 1) is representative. [0003] exist Figure 7 In the illustrated laser module 101 , laser light output from seven laser diodes LD1 to LD7 is guided to the optical fiber OF by using seven mirrors M1 to M7 . That is, the laser light output from the laser diodes LD1 to LD7 and the laser light propagating through the optical fiber OF are optically coupled via these optica...

Claims

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Application Information

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IPC IPC(8): H01S5/022G02B6/32G02B6/42H01S5/40H01S5/0239
CPCH01S5/4012H01S5/02251H01S5/02315H01S5/02255H01S5/02326G02B6/4214G02B6/4206H01S5/0239G02B6/32
Inventor 内山正裕
Owner THE FUJIKURA CABLE WORKS LTD
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