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200mW red laser.

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Clive Mitchell

Jan 1, 1970
0
I noticed that the 200mW green laser pointers on ebay are now being
joined by 200mW red laser pointers.

They describe the red ones as DPSS too. Is this true or are they just
getting mixed up? I'd have thought if they were using an IR laser to
stimulate emission of another colour then they'd have tried for 635nm to
make the beam more visible (it's 650nm). Then again the lasers might be
being manufactured for a disk storage application where 650nm is good
enough.
 
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Lostgallifreyan

Jan 1, 1970
0
'DPSS' is often used just to catch people's attention. It might as well say
DHSS or OHMSS for all the sense it makes a lot of the time.
 
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Flavio Spedalieri

Jan 1, 1970
0
Hi Redelly,

In regards to the two links, I have had a look at the auctions... my
comments as follows

The First link is SIKlighting.. These are NOT DPSS Lasers, Infact they are
simple direct diode with a focusable lens.
These modules do NOT produce Gaussian (TEM00) beams, the produce the typical
eliptical beam found with diodes.

Further more, I am in very much doubt that the output is even 50mW. I bit
the bullet and got a module to try... it was rated at 100mW... and my
initial observations is that is not much more than 20 or 30mW.

Further with regards to the seller; SIK Lighting, apparently they are out of
business (someone saw my previous posting on alt.lasers and sent me an email
directly confirming the don't exisit.. how credible... well I also question
as they were attempting to get me to look at their products).

With Regards to the second Listing... These Lasers are indeed DPSS Lasers...
Infact I would Not purchase from this guy on ebay (even though its in AU$ -
Great for me) the price is expensive.

These DPSS Lasers are manufactured by CNI (http://www.cnilaser.com/)... The
US pricing direct from the manufacture is cheaper. I have beeb in
discussions with CNI in trying to produce a low divergence unit.

Hope this helps
Regards
Flavio
 
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Lostgallifreyan

Jan 1, 1970
0
The First link is SIKlighting.. These are NOT DPSS Lasers, Infact they
are simple direct diode with a focusable lens.
These modules do NOT produce Gaussian (TEM00) beams, the produce the
typical eliptical beam found with diodes.

Surely it is still TEM00? That just means single mode in both axes. It
doesn't have to be perfectly round, according to the definitons I've seen.
 
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Lostgallifreyan

Jan 1, 1970
0
Further more, I am in very much doubt that the output is even 50mW. I
bit the bullet and got a module to try... it was rated at 100mW... and
my initial observations is that is not much more than 20 or 30mW.

That's interesting, looks like they're lying intentionally, basing their
rating on consumption, not emission. If you can post more results of your
test it might provide useful info to stop people being ripped off.
 
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Lostgallifreyan

Jan 1, 1970
0
TEM00 means a Gaussian profile for each axis. You're correct that it
need not be circular.

These higher power diodes tend NOT to be TEM00/Gaussian on the slow
axis. The wide emitting area (eg. several tens or hundreds of
microns) needed to accommodate the higher power allows for much
non-uniformity in the intensity distribution.

Mark

That would be true for multimode diodes by deffinition, I agree. Some
diodes it might not be so clear on, but most of these units will be based
on single mode DVD diodes. As these demand TEM00 (anything else is useless
for high speed optical read/write at high data density), any module based
on a single mode diode and a cheap asphere is still going to be TEM00, and
what's more, most of the newer ones will produce a tight, narrow, low
divergence, ROUND beam. :) It's hard to beleive for some, but it's easy to
prove.

Try an Opnext/Hitachi single mode DVD diode and a Philips CAY046 acylic
asphere, is my advice to those who want to try it. You'll probably get a
beam 2mm wide that is still 2 mm wide ten feet away, and astonishingly
round at all points on that path, given the basic optics used.
 
C

Clive Mitchell

Jan 1, 1970
0
Lostgallifreyan said:
Try an Opnext/Hitachi single mode DVD diode and a Philips CAY046 acylic
asphere, is my advice to those who want to try it. You'll probably get
a beam 2mm wide that is still 2 mm wide ten feet away, and
astonishingly round at all points on that path, given the basic optics
used.

Any highly recommended sites on DVD hacking for the lasers?
 
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Lostgallifreyan

Jan 1, 1970
0
Any highly recommended sites on DVD hacking for the lasers?

Sam's LaserFAQ, or here. :) Also photonlexicon.com forum. There might be
many pages scattered around showing how many 'designs' for powering one as
cheaply as possible with a couple of AA batteries and a resistor (if you're
lucky the design treats you to that resistor), but if you want something
better than a broken drive and a broken diode, search around in the places
I mentioned. The more you find, the more you'll know what to look for
specifically, when you read it.
 
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