Sumários

Michelson interferometry (1 in 3)

29 Março 2023, 11:00 • Alexandre Pereira Cabral

Setup of a Michelson Interferometer (MI), using amplitude splitting, and analysis of the generated interferograms in several configurations.

Usage of cube beam splitters and polarisation optics to control laser beam polarization.

Assessment of how the MI can be used to measure relative displacements of one of the mirrors, using a piezo electric  stage actuator to move one of the mirrors.

Analysis of several polarization optical elements (polarizers, polarizing beam splitters and wave plates) using a polarimeter (an instruments that measure the polarisation state of light).

Assembly of a homodyne quadrature detection configuration to achieve higher resolution compared to the previous simple homodyne detection.

Acquisition of interferograms using a CMOS 2D camera for psot processing.

Input Optics

27 Março 2023, 10:00 • José Manuel Rebordão

General description of LIGO Laser System and associated requirements (Joshua).

Simulation of a simple Fabry-Perot cavities: effects due to resonance or antiresonant frequencies / lengths.

 

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Signal Recycling Cavity

Power recycling

24 Março 2023, 12:00 • José Manuel Rebordão

Mathematics of the PDH control technique.

Concatenation of 2 FP cavities; reflectance and transmittance. Resonance and anti-resonant conditions.

The Power Recycling Cavity, gain, operational conditions

 

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LIGO laser system.

Signal Recycling cavity (SRC)

Spectroscopy (3 in 3)

22 Março 2023, 11:00 • Alexandre Pereira Cabral

Analysis and operation of spectrometers and monochromators to have an introductory approach to spectral decomposition of polychromatic light.

Study of the dispersion of light, the properties of diffracting elements and how they are used in monochromators and spectrographs, and the concepts of spectral resolution and resolving power.

Characterization of non-monochromatic light.

Fabry.Perot cavities

20 Março 2023, 10:00 • José Manuel Rebordão

Analysis of FP cavities in terms of reflectance and power stored. Resonance conditions and deviations from resonance conditions. Sensitivity of phase variation wrt length perturbation. Gain. Influence of Finesse and tradeoffs.

Frequency response of FP cavities. Pole of the reflected field as a function of Finesse. Temporal response of FW detectors. Tradeoffs.

Pound-Drever-Hall (PDH) control technique.

 

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Concatenated FP cavities. Power recycling Cavity.