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Interference comparator for laser diode wavelength and wavelength instability measurement
Marek Dobosz1, Mariusz Kożuchowski1
1Institute of Metrology and Biomedical Engineering, Faculty of Mechatronics, Warsaw University of Technology, Św. A. Boboli 8 St., 02-525 Warsaw, Poland.
The Review of Scientific Instruments
|May 2, 2016
Summary
A new Twyman-Green interferometer setup precisely measures laser diode wavelength and instability. This system achieves high accuracy for middle or low coherence light sources, enabling advanced displacement measurements.
Area of Science:
- * Optics and Photonics
- * Metrology and Measurement Science
Background:
- * Laser diodes are crucial light sources with varying coherence.
- * Accurate wavelength and instability measurements are vital for precision applications.
- * Existing methods may struggle with middle to low coherence sources.
Purpose of the Study:
- * To present a novel setup for measuring laser diode wavelength and instability.
- * To achieve high accuracy in wavelength evaluation.
- * To enable precise measurements for low coherence light sources.
Main Methods:
- * Utilizes a stabilized Twyman-Green interferometer configuration.
- * Employs a vacuum chamber for interferometric comparison.
- * Implements accurate fringe phase measurement techniques.
Main Results:
- * Achieved relative standard uncertainty of wavelength evaluation at 2.5 × 10⁻⁸.
- * Demonstrated uncertainty for wavelength instability measurement is an order of magnitude better.
- * Established a measurement range from 500 nm to 650 nm.
Conclusions:
- * The proposed technique offers high-accuracy wavelength measurement for middle/low coherence sources.
- * The system's evaluated wavelength can serve as a length master for displacement measurements.
- * This method enhances precision metrology for laser-based systems.
