Beam pointing detection by interference with a frequency-shifted higher-order mode

Florian Schepers, Tim Bruggenkamp, Tim Hellwig, Carsten Fallnich

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

The detection and stabilization of laser beam pointing is of great interest for multiple high precision applications, e.g., interferometric measurements [1]. Beside the typically applied beam pointing detection based on quadrant photodiodes [2] an alternative detection method based on the superposition of the deflected beam with a higher order mode has been demonstrated [3]. However, in the so far presented approach the beam pointing detection was realized by the superposition of two modes at the same frequency in a homodyne detection setup, requiring multiple detectors. Here, we present that with an alternative approach the tilt and displacement of the deflected beam can also be reconstructed from a radio-frequency beating signal generated by the deflected beam superimposed with a frequency-shifted higher-order mode on a single detector. Numerical and analytical descriptions of the beam pointing detection concept are compared, and we present a first proof-of-principle experimental realization of an one-dimensional beam stabilization which can be extended into a two-dimensional approach by the superposition with two higher-order modes with different frequency shifts.

Original languageEnglish
Title of host publication2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019
Place of PublicationPiscataway, NJ
PublisherIEEE
Number of pages1
ISBN (Electronic)978-1-7281-0469-0
ISBN (Print)978-1-7281-0470-6
DOIs
Publication statusPublished - Jun 2019
EventConference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, CLEO/Europe-EQEC 2019 - Munich Trade Fair Centre, Munich, Germany
Duration: 23 Jun 201927 Jun 2019
http://www.cleoeurope.org

Conference

ConferenceConference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, CLEO/Europe-EQEC 2019
Abbreviated titleCLEO/Europe-EQEC 2019
CountryGermany
CityMunich
Period23/06/1927/06/19
Internet address

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