We have a product idea.  All we need now is a physicist, an engineering team, 
and a billion dollars.


-----Original Message-----
From: AF <af-boun...@af.afmug.com> On Behalf Of Mark Radabaugh
Sent: Monday, February 21, 2022 3:01 PM
To: AnimalFarm Microwave Users Group <af@af.afmug.com>
Subject: Re: [AFMUG] can light wavelength be altered passively?

Well, that does bring to mind another way to do it that some LED and Florescent 
lights use - chemical compounds that excite at one wavelength and emit at 
another.   Various forms of phosphorus compounds are common.   I don’t know 
that they would be specific enough for what Steve was asking for but I have 
seen enough engineering magic in my time to say it’s probably possible.

Mark


> On Feb 21, 2022, at 10:55 AM, dmmoff...@gmail.com wrote:
> 
> Closest thing I can think of is an erbium doped amplifier.  A "pump laser"
> at one wavelength excites erbium molecules buried in the glass, and 
> the erbium emits photons at the signal wavelength to juice it up for a 
> longer ride down the line.
> 
> .....but the changing wavelength isn't the feature, it's the 
> amplifying that's the feature.
> 
> 
> 
> -----Original Message-----
> From: AF <af-boun...@af.afmug.com> On Behalf Of Mark Radabaugh
> Sent: Monday, February 21, 2022 7:26 AM
> To: AnimalFarm Microwave Users Group <af@af.afmug.com>
> Subject: Re: [AFMUG] can light wavelength be altered passively?
> 
> Nothing that I am aware of.   Lots of ways to filter and split, but the only
> way I know of to change frequency of light involves relative motion 
> between the emitter and the receiver.
> 
> Mark
> 
>> On Feb 21, 2022, at 1:49 AM, Steve Jones <thatoneguyst...@gmail.com>
> wrote:
>> 
>> is there such a thing as a filter that could passively alter a light
> wavelength? some magic prism?
>> 
>> like 1391 goes into the magic, non powered box gets touched in its no 
>> no
> square and comes out 1591?
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