Optical beat note between diode lasers locked to ultra stable Fabry Perot resonators

Interference between two independent lasers locked to ultra-stable Fabry Perot resonators made from ULE glass. Lasers have linewidth of 0.5 Hz each and thats at optical frequency 3E14Hz. The interference beat note is recorded by a fast photodiode and mixed down to audio range.

MPQ Max Planck Institute of Quantum Optics: http://www.mpq.mpg.de/~haensch/

J. Alnis, A. Matveev, N. Kolachevsky, Th. Udem, and T.W. Hänsch
Subhertz linewidth diode lasers by stabilization to vibrationally and thermally compensated ultralow-expansion glass Fabry-Perot cavities
Phys. Rev. A 77, 053809 (2008)

Category:

Education

Tags:

• ultra stable laser
• ULE Fabry Perot resonator
• sub-HZ laser beat note
• MPQ

[gamerU500]

Thank you for sharing the video . It is very interesting .I didn't reach this level ,still in school . The sub-atomic resonators , are they related to this resonator , or I'm I mistaken ? Just out of curiosity , what causes the sound every time you make something vibrate ?

Any help is appreciated :)

[minhenes]

@gamerU500 Subatomic resonators have not heard about. There is subatomic resolution. 1 Hz laser means that mirror separation is held stable with 15 digits that corresponds to size of nucleus. This is possible because light averages over a large area on the mirror.

Vibrations change mirror separation. Mirror separation determines the optical resonance frequency of the resonator.

Electron cloud shape in atoms can have similar shape like light intensity inside the optical resonator.

[gamerU500]

@minhenes

Very interesting :) . Thank you for your time :) good luck with your work .