credi 14 janvier 2015 06:05
À : time-nuts@febo.com
Cc : mag...@rubidium.se
Objet : Re: [time-nuts] Current state of optical clocks and the definition of
the second
On 01/13/2015 11:41 AM, Attila Kinali wrote:
> On Mon, 12 Jan 2015 20:09:45 +
> Gregory Maxwell < <mailto:gma
precise time and frequency measurement
Subject: Re: [time-nuts] Current state of optical clocks and the definition of
the second
Hi
I guess the question becomes how low is low.
If it’s a 50 ohm system
If the power level is rational
If you are at room temperature
There are some limits on
f precise time and frequency measurement
> Subject: Re: [time-nuts] Current state of optical clocks and the definition
> of the second
>
> Hi
>
> More or less by definition:
>
> AM noise has the sidebands in phase, PM noise has the sidebands out of phase.
> PM adds
January 14, 2015 1:22 AM
>To: Discussion of precise time and frequency measurement
>Subject: Re: [time-nuts] Current state of optical clocks and the
>definition of the second
>
>Although the phase noise when using optical combs to generate Rf
>
...@febo.com] On Behalf Of Bob Camp
Sent: Wednesday, January 14, 2015 6:14 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Current state of optical clocks and the definition of
the second
Hi
More or less by definition:
AM noise has the sidebands in phase, PM
nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce
> Griffiths
> Sent: Wednesday, January 14, 2015 1:22 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Current state of optical clocks and the definition
> of the second
>
>
ruce Griffiths
Sent: Wednesday, January 14, 2015 1:22 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Current state of optical clocks and the definition of
the second
Although the phase noise when using optical combs to generate Rf signals is low
there is no men
> Thomas Knox
>
> Thomas Knox
>
>
>
> > From: namic...@gmail.com
> > Date: Wed, 14 Jan 2015 07:00:09 +1100
> > To: time-nuts@febo.com
> > CC: namic...@gmail.com
> > Subject: Re: [time-nuts] Current state of optical clocks and the
> definition
Dr David Kirkby
Managing Director
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3
6DT, United Kingdom
Registered in England and Wales as company number 08914892
http://www.kirkbymicrowave.co.uk/
Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT)
On 13 J
v/general/pdf/2646.pdf
> Enjoy;
> Thomas Knox
>
> Thomas Knox
>
> > From: namic...@gmail.com
> > Date: Wed, 14 Jan 2015 07:00:09 +1100
> > To: time-nuts@febo.com
> > CC: namic...@gmail.com
> > Subject: Re: [time-nuts] Current state of optical clocks and
On 01/13/2015 11:41 AM, Attila Kinali wrote:
On Mon, 12 Jan 2015 20:09:45 +
Gregory Maxwell wrote:
On Mon, Jan 12, 2015 at 12:34 PM, Attila Kinali wrote:
Seems that the state of the art in stabilized lasers has improved a
lot lately, e.g. there are commercial available 1550nm devices wh
Signal Generation From Optical Frequency Division.
http://tf.boulder.nist.gov/general/pdf/2646.pdf
Enjoy;
Thomas Knox
Thomas Knox
> From: namic...@gmail.com
> Date: Wed, 14 Jan 2015 07:00:09 +1100
> To: time-nuts@febo.com
> CC: namic...@gmail.com
> Subject: Re: [time-nuts] Current s
THe stability /accuracy of lasers is entirely dependent on the cavity length.
Materials used are usually invar or silica, so you are no better off than
with a quartz crystals.
They are just a resonant cavity.
cheers,
Neville Michie
___
time-nuts mailin
On Tue, 13 Jan 2015 17:46:01 +
"Dr. David Kirkby (Kirkby Microwave Ltd)"
wrote:
> I had a brief read. Equation 1 made me wonder what could be achieved
> with a cheap HeNe laser. It should be fairly easy to mix a couple of
> HeNe lasers on a photodiode and look at the difference frequency
> b
On Tue, 13 Jan 2015 19:37:05 +0100
Attila Kinali wrote:
> If you use a standard laser diode, these have a linewidth of
> around 20-100MHz. If you provide them the slightest feedback,
> they go down to 1MHz easily (ie just by adding some window glass
> infront of the laser, that reflects a tiny bi
On Tue, Jan 13, 2015 at 5:46 PM, Dr. David Kirkby (Kirkby Microwave
Ltd) wrote:
> I had a brief read. Equation 1 made me wonder what could be achieved
> with a cheap HeNe laser. It should be fairly easy to mix a couple of
See Sams Laser Faq section on stabalized HeNe Lasers:
http://www.repairfaq.
On Tue, 13 Jan 2015 17:46:01 +
"Dr. David Kirkby (Kirkby Microwave Ltd)"
wrote:
> Of course I'm not suggesting a HeNe would provide the stability of
> cutting edge research laser optical clock, but they are easily within
> the budget of a hobbyist and could be a bit of fun to try to measure
On 12 January 2015 at 12:34, Attila Kinali wrote:
> Hi,
>
> I just stumbled over this [1] nice article by Fritz Riehle that might be
> of interest to others as well.
>
> Attila Kinali
>
> [1] "Towards a Re-definition of the Second Based on Optical Atomic Clocks",
> by Fritz
On 1/13/15 2:41 AM, Attila Kinali wrote:
On Mon, 12 Jan 2015 20:09:45 +
Gregory Maxwell wrote:
One exception here is space qualified oscillators. For those you
go to the JPL and ask them to help you.
Actually, you want to go to Applied Physics Labs (APL).. they're the USO
folks.
At JP
On Mon, 12 Jan 2015 20:09:45 +
Gregory Maxwell wrote:
> On Mon, Jan 12, 2015 at 12:34 PM, Attila Kinali wrote:
> > I just stumbled over this [1] nice article by Fritz Riehle that might be
> > of interest to others as well.
>
> I've seen less discussion of non-atomic stable optical oscillato
On Mon, Jan 12, 2015 at 12:34 PM, Attila Kinali wrote:
> I just stumbled over this [1] nice article by Fritz Riehle that might be
> of interest to others as well.
I've seen less discussion of non-atomic stable optical oscillators.
Most (all?) of these optical atomic standards are passive atomic
c
On Mon, 12 Jan 2015 13:34:03 +0100
Attila Kinali wrote:
> I just stumbled over this [1] nice article by Fritz Riehle that might be
> of interest to others as well.
And while we are at it:
"2e-18 total uncertainty in an atomic clock",
by T.L. Nicholson et.al., 2015
http://arxiv.org/abs/1412.8261
Hi,
I just stumbled over this [1] nice article by Fritz Riehle that might be
of interest to others as well.
Attila Kinali
[1] "Towards a Re-definition of the Second Based on Optical Atomic Clocks",
by Fritz Riehle, 2015
http://arxiv.org/abs/1501.02068
--
It is upon mora
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