[time-nuts] Microsemi up for sale?

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sun Mar 4 03:41:15 EST 2018


External cavity lasers with piezoelectric tuning (usually varies cavity length or tilts frequency selective grating) are usually used for such applications.

Sacher laser do some compact units with integrated Peltier cooler etc:

https://www.sacher-laser.com/home/industrial-lasers/point_and_line_laser_module/industrial_laser_modules/micron_laser.html

To get pricing registration is required.

They aren't cheap (a few thousand or so euros IIRC) but not too outrageous.

Bruce

> 
>     On 04 March 2018 at 21:21 Magnus Danielson <magnus at rubidium.dyndns.org> wrote:
> 
>     Hi,
> 
>     On 03/04/2018 04:04 AM, Richard (Rick) Karlquist wrote:
> 
>         > > 
> >         When I was working on fiber optic communication test,
> >         I remember hearing about lasers that were "tuned" with
> >         variable Peltier coolers. Power consumption is critical in
> >         a cesium standard that can run on batteries. Maybe
> >         the power consumption of the coolers is a deal breaker.
> > 
> >     > 
>     The peltier elements is needed and nowdays integrated with laserdiodes.
>     For telecom lasers, which is fully integrated, wavelength shift with
>     temperature and Peltier elements is needed to temperature-stabilize them
>     when you run DWDM, which is the telecom scenario which is close, as the
>     ITU-T channels is 100 GHz apart on a 199 THz base for the 1550 nm window.
> 
>     So, peltier elements is needed for sure.
> 
>     However, I wonder if there really is much power involved.
> 
>     Cheers,
>     Magnus
> 
>         > > 
> >         Rick
> > 
> >         On 3/3/2018 6:18 PM, Hal Murray wrote:
> > 
> >             > > > 
> > >             Thanks.
> > > 
> > >             richard at karlquist.com said:
> > > 
> > >                 > > > >                    1. Magnetic state selection, as used in the 5071A, would be replaced by
> > > >                       optical pumping. Len Cutler was heartbroken that HP/Agilent management
> > > >                       wouldn't fund this effort.
> > > > 
> > > >                 It turns out that, even now in 2018, optical pumping is not ready for
> > > >                 prime
> > > >                 time in a working standard because the lasers drift over time.
> > > > 
> > > >             > > > 
> > >             Is there something fundamental in there, or is the lack of products
> > >             because
> > >             nobody has made the big investment required to figure out how to do it.
> > > 
> > >             What is the bandwidth of the laser? What happens if it drifts
> > >             slightly? Can
> > >             it be servoed? ...
> > > 
> > >             _______________________________________________
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> > >         > > 
> >     > 



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