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Absolute distance measurement by multi-heterodyne interferometry using a frequency comb and a cavity-stabilized
Applied Optics
|July 14, 2016
Summary
This study presents a new multi-heterodyne system for precise absolute distance measurement. The developed system achieves high accuracy using a frequency comb and tunable diode laser, demonstrating a relative precision of 10⁻⁸.
Area of Science:
- Optical Metrology
- Precision Measurement
- Laser Interferometry
Background:
- Accurate absolute distance measurement is crucial for various scientific and industrial applications.
- Traditional interferometry methods often face limitations in range and precision.
Purpose of the Study:
- To develop and demonstrate a novel multi-heterodyne system for high-precision absolute distance measurement.
- To leverage frequency comb technology for enhanced metrological capabilities.
Main Methods:
- Utilized a frequency comb and a tunable diode laser locked to a Fabry-Perot cavity.
- Employed multi-heterodyne interferometry to downconvert optical frequencies to the RF region.
- Determined distances using mode phases and synthetic wavelengths.
Main Results:
- Successfully obtained numerous beat components through optical frequency downconversion.
- Achieved agreement within 1.5 μm (average of five measurements) and 2.5 μm (single measurement) compared to a reference interferometer.
- Demonstrated a relative precision at the 10⁻⁸ level.
Conclusions:
- The developed multi-heterodyne system offers a robust and highly accurate solution for absolute distance measurement.
- The system's performance validates the effectiveness of frequency comb-based interferometry for precision metrology.
