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| Birefringence * Dr. Marco Bazzan (University of Padua, Italy) gave an introduction into photo-stress tensor and polariscopes * we want to know how we can use our measured data on birefringence in Sapphire bulks to conclude about the internal stress physically * Discussion: * our device in TAMA seems not so different from a plane-polariscope but analytical considerations on how to extract stress-parameter (orientation of stress-symmetry axis and refraction-index difference) are necessary * apparently we need at least two measurements with different linear polarizations * we can upgrade the existing system with λ/4 plates to construct a circular-polariscope so that we only need one measurement to get the stress-parameter Future organization of this meeting: * MIR meeting becomes more official and may/should use official KAGRA zoom * we will start to write minutes of the meetings (--> Simon) * host will be Matteo |
MIR Meeting on 2020/12/30 18:00 - 19:00
Participants:
Next meeting
2021 Jan 20th, 18:00 - 19:00
Minutes
Birefringence
- Dr. Marco Bazzan (University of Padua, Italy) gave an introduction into photo-stress tensor and polariscopes
- we want to know how we can use our measured data on birefringence in Sapphire bulks to conclude about the internal stress physically
- Discussion:
- our device in TAMA seems not so different from a plane-polariscope but analytical considerations on how to extract stress-parameter (orientation of stress-symmetry axis and refraction-index difference) are necessary
- apparently we need at least two measurements with different linear polarizations
- we can upgrade the existing system with λ/4 plates to construct a circular-polariscope so that we only need one measurement to get the stress-parameter
Future organization of this meeting:
- MIR meeting becomes more official and may/should use official KAGRA zoom
we will start to write minutes of the meetings (--> Simon)
- host will be Matteo