[time-nuts] Re: Mitigation of lamp oven and cavity oven temperature-induced frequency variation in rubidium atomic clock

[Edgar Fernandes]

>I don't think that optical combs will enter the Rb vapor cell market any soon.

Just to add on top that efforts are being made in this direction, see for example this recent project:
https://ec.europa.eu/info/funding-tenders/opportunities/portal/screen/how-to-participate/org-details/999999999/project/101047289/program/43108390/details

The idea is to integrate directly the Rb cell in the comb, being self-referenced, to produce a clock.
This will become interesting if the device can output the clock signal as well as some comb light!


Best regards,

Edgar


Edgar Fernandes
Menhir Photonics AG

-----Original Message-----
From: Attila Kinali via time-nuts <time-nuts at lists.febo.com> 
Sent: Wednesday, 22 February 2023 08:17
To: Poul-Henning Kamp <phk at phk.freebsd.dk>
Cc: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>; Attila Kinali <attila at kinali.ch>
Subject: [time-nuts] Re: Mitigation of lamp oven and cavity oven temperature-induced frequency variation in rubidium atomic clock

On Wed, 22 Feb 2023 07:12:40 +0000
"Poul-Henning Kamp" <phk at phk.freebsd.dk> wrote:

> Is this lasers stabilized and tuned by temperature, or are we into optical comb territory here ?

Currently it's just tunable lasers. I think the most common ones are DFB and DBR lasers that are tuned using their lasing current and temperature. But there are also quite a few ECDL with either gratings or cats-eye mirrors going around.

I don't think that optical combs will enter the Rb vapor cell market any soon.
These devices still cost more than what a complete Rb standard costs today.
And almost all of them are quite finiky devices that need constant pampering (I know of only one manufacturer who makes them sturdy enough that they can run long term without problems and are even immune to being hit by a hammer)

				Attila Kinali

--
The driving force behind research is the question: "Why?"
There are things we don't understand and things we always wonder about. And that's why we do research.
		-- Kobayashi Makoto
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