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Compensating birefringence of test-mass substrates for gravitational-wave detectors with arbitrary polarization states
Optics Letters- received 03/18/2024; accepted 04/25/2024; posted 04/26/2024; Doc. ID 523753
- Abstract: Gravitational waves detectors are ultimately limitedby thermal noise in their most sensitive region. Cryo-genic operation combined with crystalline substratesand coatings is a promising approach to reduce thisnoise, thereby increasing their sensitivity and detectionrate. However, crystalline materials can exibit birefrin-gent behaviours which will degrade the detector sensi-tivity or duty-cycle. Currently, no available substrate orcoating meets the stringent birefringence requirement.Here, we demonstrate the use of a pair of identical elec-tro polarization retarders to generate arbitrary polariza-tion states and compensate birefringence of a KAGRAtest-mass substrate.