Strange Miller Index Notation [00.1]

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The discussion centers on the interpretation of the dot notation in Miller indices, specifically the notation [00.1]. It is suggested that this may refer to the notation [00\bar{1}], which is used to describe directions in hexagonal crystal systems. The notation employs three coordinates to convey specific crystallographic directions. A reference is provided to a document that explains these concepts in detail, particularly on page 101. Understanding this notation is essential for accurately describing crystallographic orientations.
Abigale
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Do someone knows what this dot "." means?
I just know this notation [001].

Thank u
Abigale
 
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Maybe they mean ##[00\bar{1}]##?
 
This is an old fashioned way to describe directions in hexagonal systems using 3 coordinates. See the first few pages here:

http://www.public.asu.edu/~rosebudx/Chap4_99_131.pdf

In particular page 101.
 
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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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