Gerberding, O.; Isleif, K.-S.; Mehmet, M.; Danzmann, K.; Heinzel, G.: Laser-Frequency Stabilization via a Quasimonolithic Mach-Zehnder Interferometer with Arms of Unequal Length and Balanced dc Readout. In: Physical Review Applied 7 (2017), Nr. 2, 24027. DOI: https://doi.org/10.1103/PhysRevApplied.7.024027
Zusammenfassung: | |
Low-frequency high-precision laser interferometry is subject to excess laser-frequency-noise coupling via arm-length differences which is commonly mitigated by locking the frequency to a stable reference system. This approach is crucial to achieve picometer-level sensitivities in the 0.1-mHz to 1-Hz regime, where laser-frequency noise is usually high and couples into the measurement phase via arm-length mismatches in the interferometers. Here we describe the results achieved by frequency stabilizing an external cavity diode laser to a quasimonolithic unequal arm-length Mach-Zehnder interferometer readout at midfringe via balanced detection. We find this stabilization scheme to be an elegant solution combining a minimal number of optical components, no additional laser modulations, and relatively low-frequency-noise levels. The Mach-Zehnder interferometer is designed and constructed to minimize the influence of thermal couplings and to reduce undesired stray light using the optical simulation tool ifocad. We achieve frequency-noise levels below 100 Hz/Hz at 1 Hz and are able to demonstrate the LISA frequency prestabilization requirement of 300 Hz/Hz down to frequencies of 100 mHz by beating the stabilized laser with an iodine-locked reference. | |
Lizenzbestimmungen: | CC BY 4.0 Unported |
Publikationstyp: | Article |
Publikationsstatus: | publishedVersion |
Erstveröffentlichung: | 2017 |
Die Publikation erscheint in Sammlung(en): | Fakultät für Mathematik und Physik |
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