Custom Discovery Roof Rack
August, 2012 - Sierra Backpacking
July 22nd, 2012 - Hiking in Santa Barbara
July 15th, 2012 - Valley of Fire
May 5th, 2012 - Afton Canyon
April 28th, 2012 - Devils Playground
Convict Creek Trail
January 2012 - Mustangs
January 3rd, 2012 - Heart Lake
August 7th, 2011 - Kelso Dunes
August 5th, 2011 - Lundy Canyon Hike
August 2011, Mammoth Archery
Birds in the garden
June 4th, 2011 - San Gorgonio
May 29th, 2011 - Sequoia National Forest
April 23rd, 2011 - Living Desert
April 2nd, 2011 - Death Valley
March 8th, 2011 - Mountain Palm Springs
February 13th, 2011 - Iron Smelt
November 13th, 2010 - Mojave
October, 2010 - Mammoth
September, 2010 - Mammoth
September, 2010 - Duck Lake Trail Backpacking
Iron bloom forging
August 28th, 2010 - Mt. San Jacinto
OSM Import: US Designated Wilderness
July 25th, 2010 - Mojave Mustangs
July 17th, 2010 - Mojave Exploration
Bloomery furnace iron smelting
Open Street Map: Mojave Project
June 13th, 2010 - Mojave
June 6th, 2010 - El Cajon Trails
Wolf Mountain Sanctuary
March 28th, 2010 - Salton Sea
March 21st, 2010 - South Main Divide
March 13th, 2010 - Anza Borrego Wildflowers
March 7th, 2010 - CSULB Japanese Garden
February 2010 - Mammoth
Dakota and Asha Celebrate Christmas, 2009
November 21st, 2009 - Mojave Road
November 14th, 2009 - Anza Borrego
Exploring The East Mojave: The Afton Canyon Area
Broken flex plate
Remote Image Serving
Astro/night photography in Inyo National Forest
Wild Mustang Sightings
September 26th, 2009 - Night Photography In Frazier Park
August 15th, 2009 - Catalina dive trip
January 24th, 2009 - Mojave Exploration
July 2008 Mammoth Vacation
President Barack Obama!
April 12th, 2008 - Wildflowers and Landmarks
My Grandfather's Alfa Romeo Spider
March 8th, 2008 - Carrizo Plain
Bridge To Nowhere
October 20th, 2007 - Big Bear Camping
October 22nd, 2007 - Fire
Scottish Highlands, Aug 7th, 2006
Scottish Highlands, Aug 6th, 2006
August 5th, 2007 - Duck Lake Trail
May 26th, 2007 - Kelso Dunes
Culloden Battlefield, Aug 5th, 2006
May 20th, 2006 - Irwindale Renaissance Faire
Edinburgh, Aug 4th, 2006
The Clifs of Moher, Aug 3rd, 2006
The Burren, Aug 2nd, 2006
Bunratty Castle, Aug 1st, 2006
May 5th, 2007 - Mojave
Truck Audio/Data Network
2007 - Master Bath Remodel
The Ring of Kerry, Jul 31st, 2006
Victory in 2006!
Blarney and Killarney, Jul 30th, 2006
Dublin and Cork, Jul 29th, 2006
Dublin, Jul 27th & 28th, 2006
What Can I Do?
April 30th, 2006 - Anza Borrego
New desktop: Intel 805 D
Jan 7th and 14th, 2006 - Hiking
Whiting Ranch Hiking
Digital Photography with Linux
September 5th, 2005 - Living Desert
August 19th, 2005 - Mammoth
Hiking and Photography
July 30th, 2005 - Tucker Wildlife Sanctuary
Death, Fright and Photography
May 14th, 2005 - Red Rock
April 2nd, 2005 - Death Valley
Count Every Vote Act of 2005
Linear Logic ScanGuage
November 6, 2004 - Mojave
Super Tuesday, 2004
Canon A80 Camera
Jul 25, 2004 - Death Valley
May 4th, 2004
Landscaping - My Front Slope
Stump Pullin' Yeeee Haw!
Feb 22nd, 2004
Feb 16th, 2004
PostgreSQL Logfile Analysis
Mountains? Desert? Jan 30th, 2004
Jan 28th, 2004
Ceiling Cargo Basket
Front Bumper Version 2
Land Rover Valve Jobs
The Matrix: Revolutions
Greg Davis CDL Linkage
Mom's Turkey Gravy
Julian Pie Company
The KB1DIG 2-meter Halo Antenna
Gardening is hard!
Aug 13th, 2003
SQL and Perl
Jul 9th, 2003
Jun 17th, 2003
Some People's Comments
Dakota is a silly dog
The Matrix: Reloaded
Chris' Stage Bottle Harness
April 23rd, 2003
DVD Burning Under Linux
My Satellite Phone
My Near-Death Experience
Laser Cannon Revival
Front Bumper, Version 2
KPC 3 Plus and HTX-252
Moving, moving moving...
New new house
In Truck Dr. Pepper
My Favorite Toilet
Late Thoughts: Dr. Pepper Cooler
265/75-R16 Tires on a DII
George W. Bush
Horses Sep 14 2002
August 17th Yukon Dives
My Custom Front Bumper
Bracketless, Renamable Links
Jul 28 2002 Day Trip
Jedi Group, my T1 and money
A Bumperless Discovery!
My Custom Rear Bumper
Vanessa's 24th Birthday
Jun 30th Dive to Long Beach Canyon
PHP/PostgreSQL String Quoting
Tonsillectomy, Uvulaectomy and Turbinite Reduction
240 Watt CO2 Laser Cannon
The Tulsa Rib Company
The quality of hard disks these days
Email notification of articles
Email notification of comments
erikburrows.com source code
Renisance Faire Jun 9, 2002
Computers hate me, and it is mutual.
Star Wars Sucks!
Horses, Jun 1, 2002
Land Rover Mileage
Insomnia, Robin goes evil.
100 Watt Diode Laser Test Firing 1
2001: A Space Odyssey
TDI Deco Class
Horses, Apr 30, 2002
My Truck Batteries
The Zope Bible
100 Watt Diode Laser
The New www.erikburrows.com
Hunter the Kitty
Matts Desert Pics
|100 Watt Diode Laser Test Firing 1 -   2002/05/09||Viewed 134 times this month, last update: 2003/12/13|
|Today Chris and I conducted our first test firing
of our 100 Watt Diode Laser. It was a complete sucess! Since the laser was meant to
feed directly into a fibre optic cable for delivery, without the fibre, the beam is very
diverse. It spreads out from the head at about a 20 degree angle. It's hot enough however
that a piece of paper held an inch away from the head will burn.|
We rigged together a focusing system using a few spare lenses, and were able to get wood
blocks to burn and char quite a bit.
Here are all the pictures.
On the very first try, we got a beam out of the first head. As you can see,
the laser is actually several lasers, in three rows, we figure about 100.
Each, of modest power, but when focused together, give 100 watts.
The second head seems to be old, or otherwise damaged. It had a much lower
The wounded wood block.
The focusing setup. We need some cleaner optics, and a better mounting system,
but for what it was, it worked fairly well!
Lasers are cool.
Matt Bell (2002-05-10): Now all you need is a secret moon base...
Erik (2002-05-10): Actually, now that we have one working laser, I'm re-energized
about getting the 240 watt CO2 laser working!
John (2002-10-28): There's hope for humanity. I'm waiting for your version of a bug-zapper with auto-tracking. Let me know when it's available.... I'm proud of you guys.
andy (2003-04-04): i to have some laser toys in wales a 80 watt electrox slow flow a ferranty 400 watt slow flow good on walls a 1200 watt trumph turbo yet to be powered up and an old haas pulse yag welder which i changed the out put cupler from 40% to 85% and replaced the xenon lamps with krypton lamps
fed the garden hose to the head for cooling, ran several cables to the diferant household ring mains measured 75amps at 240v ac and priour to blowing all the mains fuses burnt steel great fun and toys
Erik (2003-04-06): Awesome toys!
Laser Jock (2003-12-10): The laser you have was originally designed for Photodynamic Therapy and/or hair removal experiments. The nitrogen was used to prevent moisture from condensing on the diode facets.
Erik (2003-12-10): Good to know "Laser Jock", I figured it was either that, or that it was used to keep oxygen away from the diodes, to prevent oxidation. If it was simply used to keep moisture away, then we can use any dry gas, such as E-grade air, which Chris and I have lots of.
Photon Bender (2003-12-11): I was surprised when Laser Jock showed me this site. I am the person who was responsible for building this system. I think that there were originally 10 heads made and maybe 4 or 5 diode driver / cooler systems. The systems were intended for Photo Dynamic Therapy experiments being done at UCI. The label on the head is misleading; it is not a 100-Watt laser, for safety reasons the label rating exceeds the actual output. The highest output any of these heads achieved was about 20 Watts although that was out of a fiber (I would have to look up the coupling efficiency, probably around 50%) therefore the max output was probably 40 Watts. From what I recall the diodes output decayed after a short time (a year or so) and there were some diode failures. Judging by your photo it looks like there are only 3 out of 5 diodes operational, I do recall having to replace some diodes with spacers when the diode supply ran out.
Erik (2003-12-11): Wow! How interesting it is to meet the person who built this thing!
You say there were only 5 diodes in each head? Why does the beam output look like a hundred or so small rectangles? We assumed each of those were one diode.
John (2003-12-11): Holy sh*t this is crazier!!! Watch your eyes dudes...
Photon Bender (2003-12-13): There are 5 diode bars in each head. Each bar is segmented into hundreds of emitters, the emitters are isolated from each other. So the gaps you are seeing is the isolation zones. You don't have to tell me but out of curiosity how much did you pay for the system? If you want to you can buy the fiber that attaches to the head, the fiber pigtails come pre assembled. I can look up which fiber was used but I believe it was a 600 micron fiber (it takes a large diameter fiber).
Erik (2003-12-13): I see. Interesting. If I remember correctly, we paid $300 for the power supply/cooling unit, and the two heads. We bought it just for fun, and it is. Thanks for building it for us!
Photon Bender (2003-12-13): $300, you did pretty damn good. The chiller alone is worth more than that. Congratulations and have fun.
Andy (2008-01-23): Wow,that laser looks awesome... me and my friend are only just now working on our first laser... just a 5 watt laser diode on a mac light hahaha. but thanks for the inspiration to one day burn my cornea! nice work
GraveOne (2008-04-29): HELL YEAH!!! Im still working on a pocket size 500mW laser... anyone now of a good diode I could use???...
g (2009-09-14): now yo just have to pack it with a drill battery and mcu lol
startreck phaser on-the-way!
MAR (2011-02-07): Hi. A friend and I looking to build a laser cutter able to cut plastic, and I was wondering if there was any advice, manufacturers, or websites that you could recommend. You obviously know what you are doing and any tips you can give us would be much appreciated!
Erik (2011-02-13): MAR, I don't know where to send you, except maybe projects related to the makerbot.
jake (2011-10-21): im working on a science project... we need to know at what level wattage can a laser go through human skin?
Erik (2011-10-24): Hi Jake, I don't know exactly what you're trying to do, but anything above 1 milliwatt can cause immediate blindness. The above 30 watt red frequency laser could do serious burning damage to human skin, about as much as a large Fresnel lens and sunlight.
jake (2011-10-24): nothing illegal haha. Were doing this for a science fair project and testing what power the military would need to make an effective laser weapon. Basically, how much power does a laser need to be to go through a person in a half a second
Erik (2011-10-24): Jake, practicality of such a weapon aside, you'd need thousands of watts, maybe millions to accomplish such a burn. Laser weapons are much more suited for sensitive and easily de-stabilized targets, like ICBMs, which is what the military is currently developing laser weapons for.
jake (2011-10-24): right now we are in the process of making a 1 watt laser we plan to test it on ballistic gell and time it. using this we could find a rough estimate on how many watts. How thick should the ballistic gel be to repersent a human body
braiden (2011-10-24): how much heat does it take to light a match????
Photon Bender (2011-10-24): hey Erik. i was just looking at your co2 powered cannon. how much did it cost to make?
Erik (2011-10-24): Jake, a 1-watt laser will take a loooong time to melt its way though ballistic jell. For depth, I'd measure your own torso.
Braiden, sorry, no idea.
Photon Bender, the CO2 laser was bought from a salvage yard. New, it would cost several thousand dollars.
jake (2011-10-25): thanks... ill get back to you on our results at the end of the expierement