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Control method for simultaneously stabilizing laser wavelength and power and control device thereof

A technology of control device and power controller, applied in the field of optical measurement

Active Publication Date: 2012-08-08
宁波核芯光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of temperature feedback control to stabilize the laser has the disadvantages of low wavelength control accuracy, complex frequency stabilization control circuit, and poor practicability
The above-mentioned prior art does not control the fluctuation of the output power of the laser, and all have the defect of being unable to control and improve the stability of the laser power at the same time

Method used

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  • Control method for simultaneously stabilizing laser wavelength and power and control device thereof
  • Control method for simultaneously stabilizing laser wavelength and power and control device thereof
  • Control method for simultaneously stabilizing laser wavelength and power and control device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The outputs of the two monitoring beams of the beam splitter 213 of the laser are connected to the input ends of the wavelength monitoring circuit 23 and the power monitoring circuit 24 at the same time. The output of the amplification and filtering unit 232 of the wavelength monitoring circuit 23 is connected to the signal processing unit 22 , and the output of the wavelength controller 233 of the wavelength monitoring circuit 23 is connected to the control terminal of the laser resonator 211 . The output of the drive controller 243 of the power monitoring loop 24 is connected to the control terminal of the power controller 244 . The simultaneous stabilization of laser wavelength and power is realized by two independent monitoring circuits. Compared with the laser resonator, the wavelength monitoring circuit 23 constitutes the inner loop of wavelength power stable control, and the power monitoring circuit 24 constitutes the outer loop of wavelength power stable control...

Embodiment 2

[0083] and Figure 2a Example 1 differs in that, Figure 2b The wavelength control and power control of the medium laser are comprehensively controlled by the interrelated wavelength monitoring circuit 23 and power monitoring circuit 24 . The wavelength tuning of a laser resonator is affected by power regulation. The simultaneous stability of laser wavelength and power is determined by the following formula:

[0084] (3)

[0085] (4)

[0086] Dl is the desired wavelength offset, DP is the desired power offset, Y 1 is the input quantity of the wavelength controller 233, Y 2 is the input quantity of the power controller 244, K 11 and K 12 is the control coefficient of the input quantity of the wavelength controller 233, K 21 and K 22 is the control coefficient of the input quantity of the power controller. because

[0087] is a non-singular matrix, according to the required you can find out , and then through PIC control processing, the simultaneous s...

Embodiment 3

[0091] The wavelength monitor consists of a temperature-controlled gas absorption cell, or an optical interferometer, or a grating, and a photodetector. A small part of the output beam of the laser is taken out by the beam splitter, and after being converted into parallel light, it is sent to a gas absorption box with temperature control, or an optical interferometer, or a grating, and the transmitted light is received by a photodetector. Depending on the range of laser wavelengths, the photodetectors are silicon detectors or germanium detectors or detectors such as indium gallium arsenide. The change of laser wavelength can be converted into the change of current or voltage intensity after passing through gas absorption cell, or optical interferometer, or grating and photodetector. The wavelength monitor is used to monitor the change of the laser output wavelength with the working environment, and transmit the changed data to the central processing unit for processing and adj...

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Abstract

The invention provides a control method for simultaneously stabilizing a laser wavelength and power and discloses a control device of simultaneous stabilization of the laser wavelength and the power, wherein the device is formed through using the method. A wavelength monitoring loop and a power monitoring loop are established. An apparatus signal processor adopts a proportional integral control (PIC) method to control the laser wavelength and the output power. Through using a proportional integral control flow to simultaneously monitor the laser wavelength and the power, and independent and integrated control, defects generated through using the prior art can be overcome, wherein the defects comprises that: wavelength control precision is low; a frequency stabilization control circuit is complex; practicality is low; and the laser wavelength and the output power can not be simultaneously stabilized. The control device for simultaneously stabilizing the laser wavelength and the power of the invention possesses characteristics of a simple structure, high precision and a low noise. And the device is easy to be realized. By using the method and the device of the invention, a simple and practical laser light source with a simultaneously stable frequency and the power is provided for a plurality of types of the lasers in the application and optical precision measurement field.

Description

technical field [0001] The invention belongs to the technical field of optical measurement and relates to a stable laser light source for optical measurement, in particular to a control method for simultaneously stabilizing the wavelength and power of a laser and a control device for simultaneously stabilizing the wavelength and power of a laser based on the method. Background technique [0002] The parameters of light waves include amplitude or power, frequency or wavelength, phase, polarization, etc., which may vary with time. In light measurement technology, certain parameters of light waves are used as reference or scale to compare and measure the measured object. In many occasions, such as optical communication, laser finishing, precise measurement, fine analysis, display, etc., there are certain application requirements for optical wavelength, frequency, and optical power. [0003] At present, laser light sources with stable frequency and power are required in most op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/13H01S5/0683H01S5/0687
Inventor 王勇
Owner 宁波核芯光电科技有限公司
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