NOTE: The dither command is classed as an experimental feature in Finesse v2 A quick example for generating an error signal by dithering the mirror. For this we need to use the `dither` command. dither component_name f m order phase Where f and m are the dither frequency and modulation index. The first simple example […]
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The quantum noise that limits the sensitivity of a detector can have multiple sources. The main contributor is usually the vacuum noise that enters into the interferometer from the dark or also known as the AS (Anti-Symmetric) port. More generally, vacuum noise will leak into the detector wherever there is an optical loss – which […]
Introduction This is the second post discussing the shift and phase dependence of a beam going through a z-shaped telescope setup when both beamsplitters are tilted over a small angle β. The first post (part 1: theory) derived both the shift in the position of the beam and the change in phase at the detector […]
Introduction Given a z-shaped telescope setup with two beamsplitters such as depicted in Fig. 1, we calculate the effects on the outgoing beam when applying a small additional tilt β to the angle of incidence α of both beamsplitters. Such a small extra tilt is applied in Finesse 2 via the xbeta parameter of a […]
When doing optical modal modelling you will at some point have to consider how some incident mode gets scattered by some deformation or effect into another mode. There is a lot of math to take in before you start calculating stuff but there is a good review of it all here: https://link.springer.com/article/10.1007/s41114-016-0002-8#Sec118 The computational problem […]