Apparatus and method for locking DDS acousto-optic modulation wavelength

A wavelength locking and acousto-optic modulation technology, applied in lasers, phonon exciters, laser parts, etc., can solve the problems of insufficient locking, contradiction between laser linewidth and locking stability, and small error signal amplitude, and achieve easy The effect of adjusting and narrowing the output laser linewidth and narrowing the laser linewidth

Inactive Publication Date: 2009-05-27
ZHEJIANG UNIV
View PDF0 Cites 31 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the magnitude of the error signal between the laser wavelength and the atomic spectral line is also small, making the lock less stable
When the requirements for the laser line width are high, there will be a contradiction between the laser line width and the locking stability

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Apparatus and method for locking DDS acousto-optic modulation wavelength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] See attached figure 1 , DDS acousto-optic modulation wavelength locking device is mainly composed of laser 1, beam splitter 2, acousto-optic modulator 3, DDS acousto-optic driver 4, polarization beam splitter 5, convex lens 6, quarter-wave plate 7, mirror 8. Atomic vapor cell 9, photodetector 10 and lock-in amplifier 11.

[0028]The laser 1 is a tunable laser to be locked; this embodiment uses a Lynx external cavity semiconductor laser produced by Sachar. The output power is about 150mW, the output wavelength range is 776nm to 795nm, the center wavelength is set at 780.1nm, and the continuous adjustable range is greater than 20GHz. In the continuous tuning range, the laser can tune the output laser wavelength through an external control voltage. The voltage rises and moves to the short-wave direction, and the voltage decreases to the long-wave direction.

[0029] The beam splitter 2 splits the laser light output by the laser 1 to about 1 mW and enters the acousto-optic modu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a DDS acoustooptic modulation wavelength locking device and a wavelength locking method. The wavelength locking method can be realized by arranging an acoustooptic modulator and a convex lens on the basis of modulating a laser cavity in the prior art. The DDS acoustooptic modulation wavelength locking device has a concise light path, is easy to adjust, and can obviously narrow the laser linewidth and acquire enough error signal amplitude to realize stable frequency locking; due to adoption of the acoustooptic modulator, the stability of locked frequency is good and superior to that of a general voltage controlled oscillator; and due to adoption of digital frequency modulation, the DDS acoustooptic modulation wavelength locking device is flexible and convenient, and is convenient to cooperate with a digital industrial control device.

Description

Technical field [0001] The invention relates to a laser wavelength locking technology, in particular to a DDS acousto-optic modulation wavelength locking device and a wavelength locking method. Background technique [0002] In many fields of communication, industry and scientific research, it is necessary to precisely lock the laser wavelength. Usually, the output of a tunable laser is locked on the spectral line of a certain atomic vapor, such as sodium, rubidium, indium, iodine, etc. Generally, the laser is locked on the peak of the spectrum by means of phase-locked amplification. First, the output wavelength of the laser is audibly modulated, and the modulation signal will also be superimposed on the absorption spectrum when the laser passes through the atomic vapor. Then through the phase-locked amplification technology, the error between the laser wavelength and the atomic spectrum line is detected, and the laser is feedback controlled through the feedback circuit, so that t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/137
Inventor 张璋林强徐云飞王兆英
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap