Laser phase noise measurer

A noise measurement and laser technology, applied in measurement devices, noise figure or signal-to-noise ratio measurement, measurement electronics, etc., can solve the problems of increased cost of measurement devices, complex and difficult system adjustment, and limited applications, to reduce difficulty and shorten the optical path. , the effect of simplifying the operation
CN1866037BInactive Publication Date: 2010-05-12SHANXI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANXI UNIV
Publication Date
2010-05-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

The disclosed testing device for laser phase noise comprises: a phase noise conversion device with two polarization beam-splitting lens (1) and (3), and an atom gas chamber or molecule gas chamber (2). Wherein, coupling two beam linear polarization light by (1) to spread into (2), converting the phase noise into amplitude noise by electromagnetic induced coherence effect, using (3) to divide the detecting light and coupling light, and using a balance zero-beat system to detect the outgoing noise. This invention simplifies device fit to mobile and wide application.
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Description

technical field

[0001] The invention relates to a measuring device of a laser, in particular to a device for measuring the phase noise of a laser by using the coherent effect of atoms or molecules. technical background

[0002] Phase noise is one of the important indicators of lasers. It is an important research object in the fields of basic experiments of quantum optics, quantum measurement and quantum communication. In the gain medium of the laser, the phase of the spontaneously emitted photons is random and disordered, and this process leads to the change of the output field intensity, thereby causing the relaxation oscillation of the resonator. At this frequency, the refractive index of the cavity medium changes, so the linewidth of the output light is broadened.

[0003] Some experimental results show that this phase noise is concentrated in the low frequency region (<1MHz), which is mainly caused by the fluctuation of the output laser wavelength. It is found that...

Claims

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