Thermo-optical effects impact on a compact high-Q Fabry-Perot cavity characteristics

• Published in: 2024 International Conference Laser Optics (ICLO) p. 440
• Main Authors: Khabarova, K.Yu, Kryuchkov, D.S., Zhadnov, N.O., Kudeyarov, K.S., Vishnyakova, G.A., Kolachevsky, N.N.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-07-2024
• Subjects: Deformation; Fabry-Perot; Integrated optics; optical bistability; optical cavity; Optical resonators; Power transmission lines; Resonant frequency; Simulation; stable laser; super mirrors; thermo-optical effect
• ISSN: 2642-5580
• DOI: 10.1109/ICLO59702.2024.10624265

Fluctuation in the length of the reference optical cavity is the leading effect that limits the frequency relative instability of the laser locked to it. Here we've investigated the effect of optical bistability caused by residual absorption of radiation in the mirrors of a compact high-Q Fabry-Perot cavity at a wavelength of 1550 nm. Heating of mirrors by intracavity laser radiation can lead to a change in the optical length of the cavity due to thermal deformation, thermo-optical effect and light pressure. Thermal deformation leads to a hysteretic appearance of the cavity transmission line when scanning the radiation frequency in different directions. We've studied the dependence of the effect on the power of radiation introduced into the resonator and compared experimental data with simulation results. The effect can find application in the creation of optical logic devices.