High dynamic range spatial mode decomposition

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

Abstract

An accurate readout of low-power optical higher-order spatial modes is of increasing importance to the precision metrology community. Mode sensors are used to prevent mode mismatches from degrading quantum and thermal noise mitigation strategies. Direct mode analysis sensors (MODAN) are a promising technology for real-time monitoring of arbitrary higher-order modes. We demonstrate MODAN with photo-diode readout to mitigate the typically low dynamic range of CCDs. We look for asymmetries in the response of our sensor to break degeneracies in the relative alignment of the MODAN and photo-diode and consequently improve the dynamic range of the mode sensor. We provide a tolerance analysis and show methodology that can be applied for sensors beyond first order spatial modes.

Details

Original languageEnglish
Pages (from-to)10253-10269
Number of pages17
JournalOptics Express
Volume28
Issue number7
Early online date24 Mar 2020
Publication statusPublished - 30 Mar 2020