Hi,
On 2020-02-18 22:10, Attila Kinali wrote:
> On Tue, 18 Feb 2020 11:56:48 -0600
> Dana Whitlow wrote:
>
>> What's the optimum wavelength for the Rb light source?
> The one that pumps the electrons of one of the hyperfine ground
> states of the 5S orbital into the 5P orbital. Which is
On Tue, 18 Feb 2020 11:56:48 -0600
Dana Whitlow wrote:
> What's the optimum wavelength for the Rb light source?
The one that pumps the electrons of one of the hyperfine ground
states of the 5S orbital into the 5P orbital. Which is 780.241xxx nm
(see [1])
> A laser would certainly have a much
I’ve been mostly lurking on Time Nuts for ten years or so, with occasional
contributions. I wrote the tboltd software, providing a shared memory interface
for NTP and a network interface for use with Lady Heather for using the Trimble
Thunderbolt on unixy systems.
Ralph
Sent from my iPhone
Ralph
Really appreciate your response and welcome to time-nuts.
Its easy enough to change the GRI and even have multiple ones at the same
time.
So this is the big bake-off coming. I had seen a brief note in GNSS and am
familiar with other alternate solutions that have been proposed.
But its
There is a DOT demonstration for GPS alternatives. UrsaNav is operating this
week, using 8790. A consortium led by Hellen Systems will be transmitting next
week on 9960.
https://insidegnss.com/11-firms-chosen-to-demonstrate-gps-backup-technologies/
This week and next are the dry runs, the
Hi Ralph I am seeing them on on a GRI of 87900 and thast been consistent
for 10 years.
How did you hear about 99600 is there a article or link??
Update Wildwood will be on till Thursday afternoon and returning in March
at some point.
Regards
Paul
On Tue, Feb 18, 2020 at 4:21 AM Ralph Smith
I'd love to hear the outcome of your experiment with the laser.
Dana
On Tue, Feb 18, 2020 at 12:19 PM Magnus Danielson
wrote:
> Hi,
>
> Let's recall the action of the Rubidium lamp is to optically pump Rb87
> to the right state, such that state-transition using the hyper-fine
> transition can
Hi,
Let's recall the action of the Rubidium lamp is to optically pump Rb87
to the right state, such that state-transition using the hyper-fine
transition can be observed with good S/N. This is done by excite Rb87
with the two D-lines 780 nm and 795 nm, but then use the Rb85 isotope to
consume the
What's the optimum wavelength for the Rb light source? A laser would
certainly have
a much narrower linewidth than an LED, provided one can find a laser with
the correct
wavelength. Many diode lasers have a detector integrated into the same
package, making
tightly-stabilized output power a snap
On Tue, 18 Feb 2020 14:21:46 +0100
Attila Kinali wrote:
> LED, not laser diode. A LED has a bandwidth in the range of 10-40nm,
> enough to cover the necessary frequency/wavelength even with production
> variation. A laser diode is somewhere in the 100MHz range (unless ECDL),
> which means the
On Tue, 18 Feb 2020 13:42:20 +0100
Magnus Danielson wrote:
> > I still think, replacing the 5065 lamp with a 780nm LED would be worthwhile
> > to try. Yes, the LEDs have a broader spectrum than a lamp, but it is a lot
> > easier to keep it stable than a fluerescent lamp. It would also allow to
>
Magnus
You need a linear polariser plus a quarter waveplate to produce circularly
polarised light from unpolarised light. A quarter waveplate alone wont suffice.
So called circular polarisers used with modern digital cameras comprise a
polariser with the linear polariser oriented correctly
Hi,
On 2020-02-18 11:06, Attila Kinali wrote:
> On Mon, 17 Feb 2020 18:16:04 -0600
> magnus wrote:
>
>> Hi,In the 5065 and most others, the light intensity is not stabilized.
>> It should not be too hard to regulate the Rb lamp amplitude and servo
>> it to light intensity from the detector.
I think a member has been working on it with a couple of 5065's. I think it
would be easier with FRK and M100, many around with bad or weak lamps. Easy
access to lamp and optics. We have some ideas but booked for the next 9
months.Bert Kehren
In a message dated 2/17/2020 7:17:00 PM Eastern
On Mon, 17 Feb 2020 18:16:04 -0600
magnus wrote:
> Hi,In the 5065 and most others, the light intensity is not stabilized.
> It should not be too hard to regulate the Rb lamp amplitude and servo
> it to light intensity from the detector. Didn't Poul-Henning check this?
I still think, replacing
FYI, next week Wildwood will be operating on 9960.
> On Feb 17, 2020, at 9:26 AM, paul swed wrote:
>
> Should be on for the week
> They may shut down at night.
> But the Austrons are locking and warming up the SRS.
> Good luck.
> Regards
> Paul
> ___
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