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BOFH excuse #146: Communications satellite used by the military for star wars.

sci / sci.optics / Re: mixing up

SubjectAuthor
* mixing upRichD
`* Re: mixing upPhil Hobbs
 `- Re: mixing upJoe Gwinn

1
Subject: mixing up
From: RichD
Newsgroups: sci.optics
Date: Tue, 21 Mar 2023 22:46 UTC
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Subject: mixing up
From: r_delaney2001@yahoo.com (RichD)
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Say you want to generate a very narrow light
band in the UV, with precise desired frequency.
Is it feasible to do so, by starting with a reference
microwave signal, then heterodyning up and up,
doubling in successive stages?

What is the limit on this process? Assume each
stage utilizes a technology appropriate for that wavelength.

--
Rich

Subject: Re: mixing up
From: Phil Hobbs
Newsgroups: sci.optics
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Date: Tue, 21 Mar 2023 23:30 UTC
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From: pcdhSpamMeSenseless@electrooptical.net (Phil Hobbs)
Newsgroups: sci.optics
Subject: Re: mixing up
Date: Tue, 21 Mar 2023 19:30:50 -0400
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On 2023-03-21 18:46, RichD wrote:
> Say you want to generate a very narrow light
> band in the UV, with precise desired frequency.
> Is it feasible to do so, by starting with a reference
> microwave signal, then heterodyning up and up,
> doubling in successive stages?
>
> What is the limit on this process? Assume each
> stage utilizes a technology appropriate for that wavelength.
>
> --
> Rich
>

You actually go the other way, starting with a femtosecond Ti:sapphire
laser, pushing it through a holey fiber to broaden the spectrum by self
phase modulation, and then lock a line at the blue end to the second
harmonic of the red end.

It's a 1:1 lock, so there's no phase ambiguity. You can lock the beat
frequency to an RF signal, and get e.g. x10**6 frequency multiplication
without the accompanying 120 dB phase noise penalty.

Jan Hall and Ted Haensch got the Nobel prize in physics for that bit of
extreme cleverness.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

Subject: Re: mixing up
From: Joe Gwinn
Newsgroups: sci.optics
Date: Wed, 22 Mar 2023 15:30 UTC
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From: joegwinn@comcast.net (Joe Gwinn)
Newsgroups: sci.optics
Subject: Re: mixing up
Date: Wed, 22 Mar 2023 11:30:14 -0400
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On Tue, 21 Mar 2023 19:30:50 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>On 2023-03-21 18:46, RichD wrote:
>> Say you want to generate a very narrow light
>> band in the UV, with precise desired frequency.
>> Is it feasible to do so, by starting with a reference
>> microwave signal, then heterodyning up and up,
>> doubling in successive stages?
>>
>> What is the limit on this process? Assume each
>> stage utilizes a technology appropriate for that wavelength.

It is possible, but extremely difficult to achieve in practice, and
only national standards labs could do it.

What Phil H discusses below replaced the above approach overnight. It
was definitely worth a Nobel Prize. Now, locking light to microwave
is easy.

>> Rich
>>
>
>You actually go the other way, starting with a femtosecond Ti:sapphire
>laser, pushing it through a holey fiber to broaden the spectrum by self
>phase modulation, and then lock a line at the blue end to the second
>harmonic of the red end.
>
> It's a 1:1 lock, so there's no phase ambiguity. You can lock the beat
>frequency to an RF signal, and get e.g. x10**6 frequency multiplication
>without the accompanying 120 dB phase noise penalty.
>
>Jan Hall and Ted Haensch got the Nobel prize in physics for that bit of
>extreme cleverness.
>
>Cheers
>
>Phil Hobbs

Here is the Nobel Lecture (scroll down):

..<https://www.nobelprize.org/prizes/physics/2005/hansch/biographical/>

Joe Gwinn

1

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