1. étalon But… what is an étalon? Topic of the day: and other
Interferometers
But… what is an étalon?

2. L’étalon noir What is an étalon?
My first encounter with the étalon, was when as a kid I watched the movie:
L’étalon noir
Other meaning of
Étalon:
Standard
étalon de fréquence
= fréquency standard
A less glorious meaning:
a piece of glass…

3. The glass étalon A story that goes back 119 years! (since 1899)
A “Rio Grande” of ink has flown on this topic.
Fabry, C; Perot, A (1899).
"Theorie et applications d'une nouvelle methode
de spectroscopie interferentielle".
Ann. Chim. Phys. 16 (7).
Charles Fabry
Jean-Baptiste Alfred Perot
“Pulse propagation in a Fabry-Perot”
(Not to be confused with
Hercule Poirot)
Kastler 1974 – “Nouv. Rev. Optique 5:133
Daussy, Dumanchin, de Witte 1978 – Applied Optics 17:451
Xiao, Maywar, Agrawal 2011– J. Opt. Soc. Am. 28:1685
Luke Horstman 20?? – to be published…

5. Field Transmission 1 2
e-ikd
t21
r21
e - ikd 2 ~ 2 1

6. Simplest case -- geometrical model) I 2 T =1 R R 1 2 O A f B e R D

7. FABRY-PEROT WITH GAIN

8. Tilting a Fabry-Perot
In time delays: ng(BXD)/c - (BC)/c
Not a big difference,
but maybe measurable at the
larger angles X D A B C

9. tFP In time delays: ng(BXD)/c - (BC)/c Field transmission
We are concerned with
phase resonances only
Field transmission
Interface properties:
and
At resonance, integer of wavelengths on the projection of on