[time-nuts] a newbie question: where can I purchase 794.7nm VCSEL for building CPT rubidium clock?

Dana Whitlow k8yumdoober at gmail.com
Thu Jun 14 22:49:53 EDT 2018


I've been told that CD player type diodes can be successfully modulated
up to about 600 MHz, but that going much further is either difficult or
perhaps impossible.  This came from a guy (at Tektronix) who worked with
various types
of diode lasers a lot, back in the 1980's.  But at least they are cheap.  I
suspect that the leaded
package is a significant part of the issue; this ought to be somewhat
mitigated
by a suitable RF matching network.

Dana


On Thu, Jun 14, 2018 at 10:51 AM, Attila Kinali <attila at kinali.ch> wrote:

> On Mon, 11 Jun 2018 22:29:42 +0800
> mimitech mimitech <mimitech at gmail.com> wrote:
>
> > I think your information is very interesting. I didn't realize which type
> > of common LDs can do GHz level modulation (anyway I didn’t have much
> > knowledge on laser diode before).
>
> Hehe. Same here. When I looked into CPT I thought that one needs
> a fast laser diode as well. Then, a few years ago, I had the chance
> to talk to John Kitching who corrected a few of my assumptions.
>
> > It would be great If you could recommend
> > several good Laser diodes (which vendor/part number) with possible 1-2GHz
> > modulation bandwidth. Thanks!
>
> Sorry, unfortunately I do not have any reliable data on the bandwidth
> of standard laser diodes. The easiest would be probably if you select
> some diodes that you can easily acquire, then contact the manufacturer.
> Manufacturers almost always have more data on their devices than they
> put into the datasheet. They do not include it because they can either
> not sufficiently control those parameters during production, cannot
> test for it or testing would be too expensive.
>
>                         Attila Kinali
>
> --
> It is upon moral qualities that a society is ultimately founded. All
> the prosperity and technological sophistication in the world is of no
> use without that foundation.
>                  -- Miss Matheson, The Diamond Age, Neil Stephenson
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