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

mimitech mimitech mimitech at gmail.com
Mon Jun 11 10:29:42 EDT 2018


Hi Attila,

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). It would be great If you could recommend
several good Laser diodes (which vendor/part number) with possible 1-2GHz
modulation bandwidth. Thanks!

On Mon, 11 Jun 2018 10:57:50 +0200, Attila Kinali <attila at kinali.ch> wrote:
>
> On Sat, 9 Jun 2018 16:54:15 +0800
> mimitech mimitech <mimitech at gmail.com> wrote:
>
> > I prefer the 780/795nm VCSEL scheme for its simplicity. After some
> > searching, looks like the 780nm VCSELs are also not easy to source,
> > although other types of 780nm LD are common.
>
> Why are you focusing on VCSEL anyways? Standard laser diodes already
> have a modulation bandwidth that goes into several 100MHz, the better
> ones should give you 1-2GHz. With that, you should be within 6dB,
> maybe 10dB of the CW power. Given that you only need a few 10μW to 100μW
> of laser power, and that those diodes are in the 1-30mW range should
> give you enough margin.
>
>
>                         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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