What is the dielectric function of PTFE (Teflon)?

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The dielectric function of PTFE (Teflon) is sought by a forum user. A suggestion is made to check Wikipedia for relevant information. The link provided directs to the Wikipedia page for polytetrafluoroethylene, which may contain the needed data. Users are encouraged to explore this resource for detailed insights. Accessing reliable sources is essential for understanding the dielectric properties of materials like PTFE.
LouisD
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Hi,
Does anyone know where I can find the dielectric function of PTFE (Teflon) ?
Thank's
 
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Thread 'Unexpected irregular reflection signal from a high-finesse cavity'

Thread 'Unexpected irregular reflection signal from a high-finesse cavity'

I am observing an irregular, aperiodic noise pattern in the reflection signal of a high-finesse optical cavity (finesse ≈ 20,000). The cavity is normally operated using a standard Pound–Drever–Hall (PDH) locking configuration, where an EOM provides phase modulation. The signals shown in the attached figures were recorded with the modulation turned off. Under these conditions, when scanning the laser frequency across a cavity resonance, I expected to observe a simple reflection dip. Instead...
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