[time-nuts] optically pumped frequency standards

ehydra ehydra at arcor.de
Fri Jan 14 15:54:18 UTC 2011


By modulating the laser diode current you can modulate the diode 
temperature. And that changes the wavelength.

- Henry


Chris Caudle schrieb:
> On Fri, January 14, 2011 12:02 am, Bruce Griffiths wrote:
>> Kernco, Symmetricom.
> Interesting reference, I was not previously familiar with Kernco.
> The description of their "Coherent Population Trapping" method rubidium
> standard says that the laser diode is frequency modulated to generate two
> wavelengths.
> http://www.kernco.com/index2.php?page=cpt
> I thought that solid state light sources, either LED or laser diode, had
> the wavelength set by the chemical composition that determined the
> bandgap.  How would you frequency modulate a diode light source?  Is that
> a feature common to all laser diodes, or would the need for tuning
> capability exclude the low cost diodes mentioned previously ( I believe
> from Sharp, intended for CD players).

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