Bruce,
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. Predrag 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 > > >Pedrag > >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 > >http://tycho.usno.navy.mil/ptti/ptti2001/paper2.pdf > >In principle it should be possible to lock the pump beam frequency to >the desired Caesium transition. > >Bruce > >_______________________________________________ >time-nuts mailing list -- [email protected] >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
