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From: John Larkin <jjSNIPlarkin@highNONOlandtechnology.com>
Newsgroups: sci.electronics.design
Subject: Re: OT: Atomic nucleus excited with laser: a breakthrough after decades
Date: Wed, 08 May 2024 07:27:42 -0700
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On Wed, 8 May 2024 12:52:27 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:

>On 08/05/2024 09:44, Jeroen Belleman wrote:
>> On 5/8/24 01:36, John Larkin wrote:
>>> On Tue, 07 May 2024 12:17:24 -0400, Joe Gwinn <joegwinn@comcast.net>
>>> wrote:
>>>
>>>> On Tue, 7 May 2024 16:26:27 +0200, Jeroen Belleman
>>>> <jeroen@nospam.please> wrote:
>>>>
>>>>> On 5/7/24 15:35, Martin Brown wrote:
>>>>>> On 07/05/2024 06:06, Jan Panteltje wrote:
>>>>>>> Atomic nucleus excited with laser: a breakthrough after decades
>>>>>>>    <https://www.sciencedaily.com/releases/2024/04/240429103045.htm>
>>>>>>>     The 'thorium transition', which has been sought after for 
>>>>>>> decades,
>>>>>>>     has now been excited for the first time with lasers.
>>>>>>>     This paves the way for revolutionary high precision technologies,
>>>>>>> including nuclear clocks
>>>>>>
>>>>>> I wonder what the Q value for stimulated nuclear emission is?
>>>>>>
>>>>>
>>>>> They state a centre frequency of roughly 2 PHz and a decay time
>>>>> of 630s, which would put the Q in the 1e19 ballpark. Prodigious.
>>>>> No wonder it was hard to find.
>>>>
>>>> The Time guys have been looking for this forever, so to speak.
>>>>
>>>> It's the only atomic kernel transition with any degree of coupling to
>>>> electromagnetic radiation.  This will be orders of magnitude better
>>>> than such as lattice clocks.
>>>>
>>>> There will be a flood of papers.
>>>>
>>>> Joe Gwinn
>>>
>>> They aren't tuning to a resonance, but to the difference between two
>>> close resonances.
>> 
>> The current definition of the second uses something similar: Some
>> hyperfine resonance of cesium. Normal resonances are in the optical
>> domain, but hyperfine ones are RF.
>
>Which puts them in the RF frequency domain where counting cycles of the 
>continuous sine reference waveform is relatively easy.
>
>Likewise for H-maser another favourite local time reference signal.
>
>> In nuclei, normal transitions are in the gamma domain, and
>> hyperfine ones are in the domain of optics. It's just a change
>> of scale, if you will.
>
>Although there will be some big practical difficulties counting cycles 
>of a waveform at 8eV which is up into the UV. What is the current 
>highest frequency that a semiconductor divider is capable of accepting?
>
>I know that there are some optical logic circuits about but how capable 
>are they at near UV light?
>
>You can't mix this thing down without losing its fidelity. I know how to 
>double optical frequencies but how do you halve or quarter them?

I don't know if there is a way to divide a lightwave-sorts of
frequency down into the electronic domain. Much less gamma ray
frequencies.

Even the small differences cited here are still optical.