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Group-delay measurement on laser mirrors by spectrally resolved white-light interferometry
Optics Letters
|October 28, 2009
Summary
The group delay of dielectric mirrors was precisely measured using spectrally resolved white-light interferometry. This study tested components for femtosecond laser dispersion control with high accuracy.
Area of Science:
- Optics and Photonics
- Laser Physics
Background:
- Accurate dispersion control is crucial for femtosecond laser systems.
- Dielectric mirrors and Gires-Tournois interferometers are key components for managing optical dispersion.
Purpose of the Study:
- To measure the frequency-dependent group delay of dielectric mirrors.
- To evaluate the performance of chirped mirrors and Gires-Tournois interferometers for dispersion control in femtosecond lasers.
Main Methods:
- Spectrally resolved white-light interferometry was employed for precise group delay measurements.
- Measurements were conducted over a spectral range of 670-870 nm.
- Achieved a group-delay resolution of +/-0.2 fs and spectral resolution of ~1 nm.
Main Results:
- The frequency-dependent group delay of tested dielectric mirrors was accurately quantified.
- Chirped mirrors and Gires-Tournois interferometers demonstrated suitability for dispersion control applications.
- The measurement technique provided high resolution for evaluating optical components.
Conclusions:
- Spectrally resolved white-light interferometry is a robust method for characterizing optical dispersion.
- The tested components meet the stringent requirements for dispersion management in femtosecond laser systems.
- Precise group delay measurements are essential for optimizing laser performance.
