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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
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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

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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...

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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 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

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Application Information

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