[time-nuts] Home built cesium clocks???

Predrag Dukic stijena at tapko.de
Sun Jun 29 06:10:46 EDT 2008


I did my homework and collected everything from the internet I could 
get.  I have this one too.

If I go optical way, I still need 9+GHz  electrical source, so I will 
first recreate electronics. Using off the shelf DDS chips, or using FPGA.

Also I need 9 GHz AOM, so that I can split the same optical beam and 
have two wavelengths 9ghz apart.  That is a problem because I have 
only 350 MHz AOM.

Multiple pass is difficult, it would take cca 27 passes to get 9 
GHz.   On the other side, I wouldn't need the last stages of SRD 
multiplication to get 9 GHz microwave.

No doubt, I will have a lot of fun with the project.


At 11:53 29.6.2008, you wrote:
>Predrag Dukic wrote:
> > Bruce,
> >
> > I need a primary standard, and hydrogen maser is not defined as such.
> >
> > I am working at the University of Split, Croatia,
> >
> > and I want to apply for Croatia's reference time and frequency
> > reference laboratory.
> >
> > At the moment that status is unassigned, because noone in the whole
> > country thinks that is important or that it pays off in any way.
> >
> > Every user that needs precise time or frequency relies on GPS, so it
> > is not possible to find  budget for anything like this.
> >
> > This is my personal initiative, and my own money....
> >
> > I can use some equipment from other University labs, but that is all.
> >
> > Predrag
> >
>In which case optical pumping and detection using external cavity diode
>lasers (ECDLs) should be considered as this method greatly simplifies
>the Caesium beam tube by eliminating the hot wire ionizer, electron
>multiplier and state selection magnets. All optics can be external to
>the beam tube as long as appropriate windows are provided. If necessary
>you can build your own ECDL using either the Littrow or Littmann -
>Metcalf configurations. Such ECDLs have been built using off the shelf
>laser diodes without special AR coated endfaces. 100kHz stability isnt
>too onerous with adequate temperature control and suitable low expansion
>cavity spacers
>In principle it should be possible to lock the pump beam frequency to
>the desired Caesium transition.
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