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System and method for testing laser frequency noise power spectrum density based on Mach-Zehnder interferometer

A noise power spectrum and laser technology, applied in the direction of testing optical performance, etc., can solve the problem of difficult completion of PSD curve test, and achieve the effect of stable test working point, avoiding 1/f noise, and good linear range.

Inactive Publication Date: 2013-02-27
ZHEJIANG UNIV
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Problems solved by technology

However, it is difficult to directly test the PSD curve. It is necessary to linearly convert the frequency noise to obtain the light intensity, and then perform the test

Method used

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  • System and method for testing laser frequency noise power spectrum density based on Mach-Zehnder interferometer
  • System and method for testing laser frequency noise power spectrum density based on Mach-Zehnder interferometer
  • System and method for testing laser frequency noise power spectrum density based on Mach-Zehnder interferometer

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Embodiment Construction

[0015] Such as figure 1 As shown, the laser frequency noise power spectral density test system based on the Mach-Zehnder interferometer includes a laser to be tested 1, an isolator 2, an attenuator 3, a first 50% coupler 4, a phase modulator 5, a delay fiber 6, Acousto-optic frequency shifter 7, second 50% coupler 8, first photodetector 9, second photodetector 10, lock-in amplifier 11, servo loop 12, signal source 13, electronic spectrum analyzer 14; laser to be tested 1. The isolator 2, the attenuator 3, the first 50% coupler 4, the phase modulator 5, the second 50% coupler 8, the first photodetector 9, the lock-in amplifier 11, and the servo loop 12 are connected in sequence, The servo loop 12 is connected to the phase modulator 5; the first 50% coupler 4, the delay fiber 6, the acousto-optic frequency shifter 7, the second 50% coupler 8, the second photodetector 10, and the electronic spectrum analyzer 14 in sequence The signal source 13 is connected with the acousto-optic...

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Abstract

The invention discloses a system and a method for testing laser frequency noise power spectrum density based on a Mach-Zehnder interferometer. A laser central frequency is locked at an orthogonal point of an interference curve of the Mach Zehnder interferometer through a feedback loop, so the system works in a good linearity range, converts laser frequency noise into light intensity, and fulfills an aim of performing direct test through an electronic frequency spectrograph; and a frequency observation point avoids 1 / f noise of the test system through the frequency shift by an acousto-optic frequency shifter. The invention provides the stable testing method which is used for testing laser frequency noise power spectrum density, is applied to an electronic frequency spectrograph, provides a means for analyzing the influence of laser frequency noise on an optical system, and has significant scientific meaning and application value.

Description

technical field [0001] The invention relates to the technical field of testing and measuring optical instruments, in particular to a laser frequency noise power spectral density testing system and method based on a Mach-Zehnder interferometer. Background technique [0002] The calculation of the influence of laser frequency noise on the optical system needs to accurately obtain the PSD characteristics of laser frequency noise, and it is very necessary to establish a test system for laser frequency noise PSD characteristics. However, it is difficult to directly test the PSD curve. It is necessary to convert the frequency noise to obtain the light intensity through linear conversion, and then perform the test. [0003] Common laser frequency noise PSD test methods include sideband locking method and Ponud-Drever-Hall (PDH) frequency locking method. PDH frequency locking technology requires the use of high-precision Fabry-Perot cavity, the construction system is complicated...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02
Inventor 张顾洪马慧莲金仲和
Owner ZHEJIANG UNIV
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