Fiber laser system and laser output method
A fiber laser and laser technology, which is applied to lasers, laser parts, phonon exciters, etc., can solve the problems of low anti-reflection of FLU20 and unstable oscillation state of FLU20, and achieve the effect of improving reliability
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no. 1 approach 〕
[0037] (Structure of laser output system)
[0038] refer to figure 1 A configuration example of the fiber laser system of the present invention will be described. figure 1 It is a block diagram illustratively showing a configuration example of the fiber laser system 1 of the present embodiment.
[0039] Such as figure 1As shown, a fiber laser system (Fiber laser system) 1 includes: a plurality of fiber laser units (hereinafter referred to as FLU) 2a, 2b, 2c (laser sources), an output beam combiner 3 (beam combiner: Combiner), an output Section 4, optical fibers F1, F2, current sources 6a, 6b, 6c, and control section 7.
[0040] The FLUs 2 a , 2 b , and 2 c respectively generate and output multiple laser beams to be combined by the output beam combiner 3 , and therefore can be regarded as laser light sources of the fiber laser system 1 . In the present embodiment, the configurations of FLU2a, 2b, and 2c are the same, so the configuration of FLU2a will be described here. ...
no. 2 approach 〕
[0086] In Embodiment 1, on the premise that the magnitudes of the driving currents given to the respective LDs by the current sources 6 a , 6 b , and 6 c are the same, there are differences at the driving start times. On the other hand, the control unit 7 may control the current sources 6a, 6b, and 6c so that the magnitudes (pulse heights in the case of pulse currents) of the drive currents given to the respective LDs by the current sources 6a, 6b, and 6c are different. drive. This control is based on the principle that the greater the magnitude of the drive current, the faster the power of the laser output from the LD rises. In other words, the peak of the high-power laser appears earlier than the peak of the low-power laser.
[0087] The relationship between the magnitude of the drive current and the rise time of the power of the laser light output from the LD can be obtained by measurement in advance. Therefore, the control unit 7 may control the current sources 6a, 6b, 6c...
no. 3 approach 〕
[0089] The difference in the easiness of SRS (Stimulated Raman Scattering) generation in FLU2a, 2b, and 2c is evaluated below, and based on the evaluation results, when the drive of FLU2a, 2b, and 2c is shifted by a predetermined time Ts, the drive is determined. The method of starting the sequence will be explained.
[0090] The inventors of the present application have found that if an SRS is generated in one of the FLUs 2a, 2b, and 2c, the Stokes light waveguided in the FLU that generates the SRS is due to Rayleigh scattering in the output beam combiner 3, optical fiber F2, etc. , Fresnel reflection, etc. to reach other FLUs, or the Stokes light reflected by the processing object 5 and returned to the fiber laser system 1 passes through the output beam combiner 3 and the like to reach other FLUs. As a result, the power of the light serving as the seed light of the Stokes light in the other FLU increases, so that the other FLU also generates the SRS. As a result, all FLU2a,...
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