Sujet : Re: OT: Atomic nucleus excited with laser: a breakthrough after decades
De : pcdhSpamMeSenseless (at) *nospam* electrooptical.net (Phil Hobbs)
Groupes : sci.electronics.designDate : 09. May 2024, 01:35:19
Autres entêtes
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Joe Gwinn <
joegwinn@comcast.net> wrote:
On Wed, 8 May 2024 14:45:42 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
[snip]
The cleverest part of the Hall-Haensch comb generator is that you can lock
the blue end of the comb to the second harmonic of the red end, one tooth
off, and lock the difference to a good reference. Then all the teeth have
the same phase noise as the reference oscillator, rather than 20 log(600
THz / 100 MHz) ~ 138 dB worse, as it would be in a multiplier.
Hmm. It had to be true, but I never connected the dots there. What
is mechanism by which this is achieved? References?
Thanks,
Joe Gwinn
Don’t have the reference handy, but the basic idea is to use a modelocked
system Ti:sapphire laser at 750 nm to generate ~100-fs pulses, then use
fiber/grating pulse compression to bring that down to a few femtoseconds,
followed by a holey fiber to broaden the spectrum to more than an octave.
Jan Hall is one of the best instruments guys ever.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC /Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics