50 mW laser with d&s laser system
On: Tue, Nov 27, 01 11:10:28 PM
Dustin Dooley wrote:
|I've just recieved a 50mW panasonic laser from optima
optics, and tried it with Mr. DeFreitas laser system and it
seems to be working wonderfuly. I havn't tested it for a
long period of time yet but the initial tests have been
successful. The diode was purchased from the same company
that Mr. DeFreitas links to on his D&S laser web page. |
Colin Kaminski - Wed, Nov 28, 01 02:17:39 AM Are you able to measure the output? I have asked Frank what
would be involved to change diodes but I have not heard
back yet. Let us know how it works out. 18.104.22.168
Dustin Dooley - Wed, Nov 28, 01 02:19:47 PM I do not have anything to measure the output, but it seems
to be brighter to the eye compared to the 30 mW. The specs
match up to the mitsubishi diode very well accept for a few
tiny differences wich include, diode reverse voltage 2 max.
for the 30mW and 1.5 max. for the 50mW, threshold current 70
mA max. for the 30mW and 50 mA max. for the 50mW, operating
current of 120 mA for the 30mW and 115 mA for the 50mW, and
the monitor current of .3 mA for the 30mW compared to .1 mA
for the 50mW. I'm not an electronics guru but this seems
to be tolerable differences. If not please correct me. My
d&s system is operating at 2.4 volts to the diode. The 50mW
diode typicaly runs in the 2.5 range at 660 nm. Running at
2.4 it should be right at 657 nm. I did nothing to change
the circut board and it seems to be working wonderfuly. I
just wish I had the numbers off of the laser driver chip Mr.
DeFreitas sent so that I could make another circuit he is a
smart buisness man and sanded off the info. Sorry Mr.
DeFreitas I can't afford another $140 dollar kit no
offence, and I hope none is taken. 22.214.171.124
Colin - Wed, Nov 28, 01 09:39:10 PM Here is the link to the diode for those interested.
Tom B. - Thu, Nov 29, 01 03:49:29 AM So how does this diode look in an interferometer setup?
Fringe contrast and stability, coherence length ...
Is it any good for holography?
Joe Farina - Thu, Nov 29, 01 09:50:49 AM Dustin,
The chip in my D&S system is: Sharp IR3C07. This is a chip
manufactured by Sharp to drive laser diodes. After a
friend of mine chipped off the heatsink which was covering
the chip of my D&S system (he's much better with
electronics than I am), I was able to read some of the
numbers (which were partially concealed through a thin
layer of adhesive). It then took a considerable amount of
detective work to determine what this chip really was. The
full number appears to be IR3C07/N, but, as I recall,
the /N part was not on the chip itself. The only other
information I have concerning this chip is that it has a
maximum driving current of 150mA and a supply voltage of
+5. Also, it's "For CD player (Built-in analog APC
function)" If you do some serious searching on one of the
Sharp websites, you may be able to find a schematic which
is a close "match" to the IR3C07/N. That's what I did,
and, as I recall, I was satisfied that I found the correct
schematic, but it wasn't explicitly stated that it was the
IR3C07/N. Sorry, but I don't have a link to the pages
where I found this information, but it was on a Sharp
Dustin Dooley - Thu, Nov 29, 01 11:55:15 AM I havn't tested the diode in any sort of way I just received
it. I probably won't be able to test it until after
christmas when I do I will get back to you. If anyone else
purchases the diode and does some testing please post it. I
want to thank Joe for his diligent detective work. I do
not want to take buisness away from Mr. DeFreitas but just
simply want to make another for myself. Thank you very
David Asp - Wed, Jan 16, 02 01:40:50 PM Have you been able to do any more testing with the 50mW
diode? I also purchased this diode but have not recieved
my D&S Driver kit yet. Also have you been able to put
together another D&S system for yourself. Thanks! 126.96.36.199
Justin Hays - Tue, Feb 26, 02 05:17:38 PM Hi everyone,
On January the 1st of this year, I ordered a Panasonic
LNCQ05PS laser diode from Optima Precision.
I designed and made some circuit boards around that laser
specifically, and finally got to installing the laser
itself and doing a "smoke test" ; )
Well, I fired it up last night, everything went
beautifully. Except, that, at 2.5V on the diode, the beam
(after collimation) looked like something I purchased from
the local gas station for $12.00 or so. After collimation,
the beam looks identical to your typical red laser pointer
when I shot them on the wall next to each other. 5mW in
I called Optima about an hour ago, their secretary was
extremely rude and as soon as I mentioned the problem, she
immediately said "...you must have overpowered it..." I
gaurantee you she didn't have a data sheet in front of her.
I mean, she could have easily handed me off to someone more
qualified but she didn't. She also stated "...there is no
way we sent you the wrong laser...". Since when were there
100% perfect people in this world?
Anyhow the diode fried at 2.7V which is still below Vmax by
the data sheet on the LNCQ05PS. The failure mode was
typical, a very low power beam that you can barely see.
I emailed Optima just now.........I really hope they do
something about this, because I want the 50mW that I payed
for. I was really excited last night when I got it working,
as it would have been the highest-power that I have worked
with up to date. I'm really dissapointed....I wanted to be
blinded with 50mW of deep red speckle all over the place.
THE SAME THING HAPPENED TO MY FRIEND. He lives about an
hour away from me in N. Houston, he tried the laser about a
month ago and reports the same thing, about 5mW.
Sorry to bother you guys, I accidentally found this list
and thought that you would all like to know.
I will keep everyone posted if that is okay?
Website: www.hvguy.com (lots of good laser pics all kinds!!)
Dooley - Wed, Feb 27, 02 01:35:38 AM I have to say that the laser that I received LNCQ05PS using
the D&S driver was very bright to say the least. Could it
be the driver that you are using is the problem. I had the
same problem when I first built a circut i hooked it up and
there was little laser power. The problem was that I had
forgoten a simple ground wire from the diode. Not saying
that this is the problem but simply stating my experience. 188.8.131.52
Justin Hays - Mon, Aug 26, 02 02:33:35 AM I am back now after about 6 months!
Dooley: I am positive (no pun intended) I had everything
hooked up right. My voltages and currents were measured
directly across and in line with the diode, respectively. I
have years of experience with electronics, and know that my
measurements were real.
After bugging Optima Precision numerous times to send me
the correct diode, they told me to send the diode back
for "inspection" to see if it was indeed, fried. And so I
Me and an engineer there went around with many things.
Vmax. Imax. Optical output power (he told me that I
absolutely had to use an OPTICAL POWER METER --> the hell
if a normal person can't tell how 50mW compares to 5mW! And
I AM taking the deeper red wavelength of the LNCQ05PS into
account! I knew he'd mention that one, saying "the dot
wasn't bright" is kindof asking for it ; ) We also argued
about ESD and other crap. Anyhow: so after much effort, the
end result was I got screwed out of 50 bucks. Damn them. My
best bud got screwed too. He had access to an optical power
meter - guess what it read?
That is NOT what we payed for.
Website: www.hvguy.com 184.108.40.206
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