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From: Joe Gwinn <joegwinn@comcast.net>
Newsgroups: sci.electronics.design
Subject: Re: OT: Atomic nucleus excited with laser: a breakthrough after decades
Date: Thu, 09 May 2024 14:26:12 -0400
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On Wed, 8 May 2024 23:35:19 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>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. 

I'll poke around his publications.  He's bound to have left tracks.

Thanks,

Joe Gwinn