Apparatus and method for locking DDS acousto-optic modulation wavelength

A technology of wavelength locking and acousto-optic modulation, which is applied to lasers, phonon exciters, laser components, etc., can solve the problems of insufficient locking, contradiction between laser line width and locking stability, small error signal amplitude, etc., and achieve easy Adjusting and narrowing the output laser line width and the effect of narrowing the laser line width

Inactive Publication Date: 2010-08-11
ZHEJIANG UNIV
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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

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  • Apparatus and method for locking DDS acousto-optic modulation wavelength
  • Apparatus and method for locking DDS acousto-optic modulation wavelength

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Embodiment 1

[0027] Referring to accompanying drawing 1, the DDS acousto-optic modulation wavelength locking device mainly consists of a laser 1, a beam splitter 2, an acousto-optic modulator 3, a DDS acousto-optic driver 4, a polarization beam splitter 5, a convex lens 6, and a quarter-wave plate 7. Composed of mirror 8, atomic vapor pool 9, photodetector 10 and lock-in amplifier 11.

[0028]Said laser 1 is a tunable laser to be locked; what is used in this implementation example is a Lynx external cavity semiconductor laser produced by Sachar Company. The output power is about 150mW, the output wavelength range is from 776nm to 795nm, the center wavelength is set at 780.1nm, and the continuously adjustable coordination 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 increases to move to the short-wave direction, and the voltage decreases to move to the long-wave direction.

[002...

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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 wavelength of the laser. Usually the output of the tunable laser is locked on the spectral line of some kind of atomic vapor, such as sodium, rubidium, indium, iodine and so on. Generally, the laser is locked on the peak of the spectrum by lock-in amplification. First, the output wavelength of the laser is modulated by audio frequency, and the modulation signal will also be superimposed on the absorption spectrum line when the laser passes through the atomic vapor. Then, through lock-in amplification technology, the error between the laser wavelength and the atomic spectral line is detected, and the laser is feedback-controlled through the feedback c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/137
Inventor 张璋林强徐云飞王兆英
Owner ZHEJIANG UNIV
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