If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #177
Joined: Wed Feb 15 2006, 02:16PM
Location: Munich, Germany
Posts: 214
Hi
I just finished my very crude work on a "laser pen" (its not actually meant for use as a laser pointer) made from a DVD laser diode. The laser is strong enough to be used to engrave/write into black plastic.
Look for yourself:
Ever seen a laser pen that could literaly write? With the LASER
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Nice. What is the output power? Did you collimate the beam, and if so how did you do it? I have a junked CD-RW burner which should contain an IR laser diode, not as much power as a DVD laser but still enough to be fun. I think I might try using the lens form a standard laser pen for collimating.
That's nice. I just bought a new DVD burner to have a reason to disassemble the old one ;) What do you use as power supply? Currently I'm using a 3,7V mobile phone accu with a 8,3 ohm resistor, giving about 400mA.
To Uzzors:
Nice. What is the output power? Did you collimate the beam, and if so how did you do it? I have a junked CD-RW burner which should contain an IR laser diode, not as much power as a DVD laser but still enough to be fun. I think I might try using the lens form a standard laser pen for collimating.
The infrared lasers are also fun. If well collimated they can burn black plastic too.
Registered Member #151
Joined: Sun Feb 12 2006, 02:53PM
Location: Poland
Posts: 153
Dalus wrote ...
do you have a way to measure the optical power?
Actually no. But I can measure a characteristic of the laser diode using a photodiode. It gives me a shape of characteristic without scale on the optical power axis (or with photodiode current on this axis):
hmm, I don't know what I did wrong but I just killed two of my IR-LDs with measured 10mA... Aren't 12V bad for these LDs?! Or have I a momentarily lack of intelligence at the moment... :(
Registered Member #177
Joined: Wed Feb 15 2006, 02:16PM
Location: Munich, Germany
Posts: 214
Killing the diode with 10mA sounds odd. The 12V from the schematic, are not directly connected to the diode of course. The circuit automaticly regulates it, to achieve constant current.
arggg.... after several testings with normal LEDs, which where successfull, I finally killed my 650nm LD... I really don't know haow it happened, not connected in reverse, measured current below 30mA, just turned into a useless and poor red LED!
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.