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Updated: Jun 5, 2026
High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
Published on: December 22, 2015
Highly sensitive dispersion measurement of a high-power passive optical resonator using spatial-spectral
Ioachim Pupeza1, Xun Gu, Ernst Fill
1Fraunhofer Institute for Physical Measurement Techniques IPM, Department of Terahertz Measurement and Systems, Erwin-Schroedinger-Str, Building 56, 67663 Kaiserslautern, Germany. daniel.molter@ipm.fraunhofer.de
Abstract:
We apply spatially and spectrally resolved interferometry to measure the complex ratio between the field circulating inside a high-finesse femtosecond enhancement cavity and the seeding field. Our simple and highly sensitive method enables the measurement of single-round-trip group delay dispersion of a fully loaded cavity at resonance for the first time. Group delay dispersion can be determined with a reproducibility better than 1 fs2 allowing the investigation of nonlinear processes triggered by the high intracavity power. The required data acquisition time is less than 1 s.
