It Seems D&S lasers have a competitor...
On: Tue, Jan 22, 02 10:45:13 PM
Jim McPherson wrote:
|It seems Mr.Gentet has produced a "phase locking" laser
diode system for holography. It's features look very very
similar to the D&S system. The big difference is the price!
Where the D&S system costs about $300, the "Samurai II"
costs about $3000! I'd really like to see a comparison
between these to laser drivers. Check out this link:
Jonathan - Wed, Jan 23, 02 02:39:52 AM As good as the D&S driver is, it wasn't designed
with "phase locking" as a feature.
I've used the D&S driver for well over a year, and it is
very good at what it was designed for - which was to
provide stable, controlled power to the Mitsubishi diode.
"Phase locking" is predicated on there being an absence of
mode hopping, a primary source of frequency instability.
Diode lasers are particularily prone to mode hopping unless
their temperature is precisely controlled. Even then "phase
locking" requires further steps must be incorporated into
Colin Kaminski - Wed, Jan 23, 02 11:08:24 PM I would not really say they are competitors. The D&S fringe
lock seems to be accurate control of the output power. The
phase lock on the Samurai seems to be achieved by bleeding
a small amount of power from the laser beam and storing the
frequency then comparing the present frequency with the
past frequency and adjusting the temperature and power to
match them. They are very secretive with their technology
but I think that is what they do. Jonathan has been
following their progress very carefully. 184.108.40.206
Jim McPherson - Thu, Jan 24, 02 08:32:50 PM Let me ask this, and I know you don't know exactly... but.
It seems that once the "phase" detector actually reads that
something is wrong, then you can't fix the bad light that
has already come out of the laser, you can only correct it.
If so how does this help holography? 220.127.116.11
Colin - Thu, Jan 24, 02 10:13:17 PM Because the fringes can shift 1/10 of a fringe before there
is a decrease in diffraction efficiency you only have to
make the detector more accurate than that. :-o 18.104.22.168
Guillermito - Sun, Feb 03, 02 03:20:18 AM To be historically precise (and once again i'm doing a bit
of advertizing for my french fellows, but who cares :), Yves
Gentet sells the Samourai diode laser since 1995 or 1996,
but at this time nobody knew him. Mr deFreitas contacted him
with questions, and a little bit later sold his own
simplified version of an holography diode laser.
Guillermito (email@example.com) 22.214.171.124
Guillermito - Sun, Feb 03, 02 03:33:09 AM Hmm... I guess i need more coffee. Let me precise a bit.
I don't want to suggest Mr deFreitas copied the Samourai
design. They seem to be very different anyway. I just wanted
to say that the Samourai diode laser existed years before
the DS one.
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