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Optical fiber laser device and output monitoring method

A fiber laser and optical fiber technology, applied in lasers, laser components, optics, etc., can solve problems such as inability to separate spectra and difficulty in using them

Inactive Publication Date: 2015-03-11
TOWA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] but as before image 3 As shown, the central wavelength of the spectrum of the background light is close to that of the signal amplified light, and overlaps wider than the spectral range of the signal amplified light, so the spectrum cannot be separated
[0027] Therefore, it is difficult to extract the signal amplification light and the background light from the output light based on the wavelength by using the above-mentioned FBG or the like.

Method used

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  • Optical fiber laser device and output monitoring method
  • Optical fiber laser device and output monitoring method
  • Optical fiber laser device and output monitoring method

Examples

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Embodiment approach

[0087] 2. Modification

[0088]

[0089] Figure 5 It is a figure which shows one embodiment of the fiber laser apparatus 101 to which this invention is applied.

[0090] The fiber laser device 101 includes a laser light source 111 , a laser control system 112 for controlling the laser light source 111 , and a processing unit 113 .

[0091] The laser light source 111 includes the following structures: a starting LD (laser diode) 131, a bandpass filter (BPF) 132, an isolator 133, an exciting LD (laser diode) 134, a coupler 135, an optical amplification fiber 136, an isolator 137, Band pass filter (BPF) 138, excitation LD (laser diode) 139A to 139D, coupler 140, optical amplification fiber 141, isolator 142, TAP connector 143, end cap (end cap) 144, optical filter 145, and photodetector 146 .

[0092] The activation LD 131 pulses and oscillates under the control of the laser control system 112 to emit pulsed activation light. In addition, the wavelength of the activation l...

Deformed example 1

[0179] In the above description, an example was shown in which the digitalized detection values ​​are supplied from the signal processing units 206A and 206B to the drive control unit 161 , but the drive control unit 161 may be supplied with, for example, Figure 8 Analog electrical signals such as waveform 8 and waveform 9.

Deformed example 2

[0181] In addition, in the signal processing unit 206A and the signal processing unit 206B, the length of the time average period for calculating the signal light detection value and the background light detection value can be adjusted according to the purpose. For example, it is desirable to set a relatively long period (for example, about 100 milliseconds) when identifying the average power of signal amplification light and background light with respect to the set laser conditions (repetition frequency, excitation power, etc.). In addition, when using the monitor value of the average power of the signal amplified light for feedback control to stabilize the laser output, it is desirable to set a relatively short period (for example, about several milliseconds).

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Abstract

The invention relates to an optical fiber laser device and an output monitoring method. According to the invention, the detection accuracy of signal amplification light and background light of the output light of the optical fiber laser device can be improved. A TAP connector (143) can be used to diverge a part of the output light emitted by the light amplification optical fiber in order to take the sample light. A light radiodetector (146) can use the sample light to perform the light-to-current conversion in order to generate the detection signal corresponding to the quantity of light of the sample light. A multiplexer(205) can be used to take a signal light taking signal, namely a detection signal during a first period of outputting the signal amplification light, and to remove a background taking signal, namely a detection signal during the first and the second periods. The invention can be used for the optical laser device.

Description

technical field [0001] The present invention relates to a fiber laser device and an output monitoring method, and in particular to a fiber laser device and an output monitoring method that improve the detection accuracy of amplified signal light and background light included in the output light of the fiber laser device. Background technique [0002] In a fiber laser device using an optical fiber as a medium, the naturally emitted light generated in the core of the optical fiber is amplified by the remaining gain that does not contribute to the amplification of the signal amplified light used for processing, and becomes background light (ASE (Amplified Spontaneous Spontaneous Light) Radiation: Amplified Spontaneous Emission) light), and mixed into the output light output from the fiber laser device. This background light does not affect the laser processing (for example, laser marking, laser correction, laser drawing, etc.) with the effect of high peak output, so if the rati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/10G01J1/42
CPCG02B6/12007G02F1/015H01S3/0064H01S3/127
Inventor 户川拓哉
Owner TOWA