研究目的
To resolve the problem of determining the effective center wavelength for OFC heterodyne interferometry, which is essential for accurate distance measurement due to the wide spectrum and potential asymmetry in beam spectra.
研究成果
The proposed method for calculating the effective center wavelength in OFC heterodyne interferometry is validated through simulation and experiment, showing good agreement with less than 0.06% relative difference. The effective wavelength depends on beam spectra and time delay, and the method is useful for applications like ranging and pulse alignment.
研究不足
The coherence length of the OFC is short, limiting displacement measurements to about 2.5 μm. The repeatability of the commercial interferometer is only about 15 nm for short displacements, contributing to measurement errors. If beams come from different optical fibers, initial phase differences due to fiber chirp could affect results and require further investigation.
1：Experimental Design and Method Selection:
The study used an equal-arm heterodyne interferometer with an OFC source. A theoretical method was developed to calculate the effective center wavelength based on the spectra of the interfered beams and time delay, verified through simulation and experiment.
2：Sample Selection and Data Sources:
The light source was a homemade mode-locked erbium-doped fiber femtosecond laser with specific parameters. Optical spectra of beams were measured using an optical spectrum analyzer.
3：List of Experimental Equipment and Materials:
Equipment included an OFC laser, AOM, mirrors, beam splitters, collimating lenses, photodetector, bandpass filter, lock-in amplifier, PZT, signal generator, commercial interferometer, and OSA. Materials involved optical fibers and free-space optical components.
4：Experimental Procedures and Operational Workflow:
The OFC beam passed through an AOM to create frequency-shifted beams, which interfered after equal path lengths. The heterodyne signal was detected, filtered, and its phase measured. Displacements were induced via PZT and monitored with a commercial interferometer for comparison.
5：Data Analysis Methods:
Phase data from the lock-in amplifier and displacement data from the commercial interferometer were used to calculate the effective center wavelength using derived equations. Numerical differentiation and statistical methods were applied for simulation and experimental validation.
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frequency synthesizer
33250A
Agilent
Stabilizing the repetition frequency of the OFC
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optical spectrum analyzer
AQ6370C
Yokogawa Electric
Measuring the optical spectra of the beams in the interferometer arms
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lock-in amplifier
SR844
Stanford Research System
Measuring the phase of the beat signal compared to a reference signal
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atomic clock
5071A
Symmetricom
Referencing the frequency synthesizer for frequency stabilization
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acousto-optic modulator
MGAS80-A1
AA Opto Electronic
Modulating the laser beam to create frequency-shifted beams for heterodyne interference
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photodetector
1811
New Focus
Detecting the heterodyne interference signal
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piezo-electric transducer
Driving the mirror to induce displacements for measurement
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signal generator
Generating control signals for the PZT and other components
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commercial interferometer
He-Ne
Monitoring displacements for comparison with OFC interferometer measurements
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