Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Gas Lasers



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 05-08-2014, 02:09 AM #1
brendon7358's Avatar
Class 2M Laser
 
Join Date: Jul 2011
Location: North Carolina, USA
Posts: 703
Rep Power: 117
brendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond repute
brendon7358 brendon7358 is offline
Class 2M Laser
brendon7358's Avatar
 
Join Date: Jul 2011
Location: North Carolina, USA
Posts: 703
Rep Power: 117
brendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond repute
Default What lasers are used in lasik?

I have a school project for ap chemistry and we need to disprove a movie scene, I am using this scene

I need to know what the max power of the lasers used is to prove that it cannot do that kind of damage, so far I have been able to find out that they are 193nm (not red!) and the gas laser is called an excimer laser, but I need more information. If you guys could help me out that would be great. If you could include sources that would be even better. Thanks



Last edited by brendon7358; 05-08-2014 at 02:13 AM.
brendon7358 is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 05-08-2014, 03:51 AM #2
ARG's Avatar
ARG ARG is offline
Super Moderator
 
Join Date: Feb 2011
Location: Canada
Posts: 6,987
Rep Power: 1891
ARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond repute
ARG ARG is offline
Super Moderator
ARG's Avatar
 
Join Date: Feb 2011
Location: Canada
Posts: 6,987
Rep Power: 1891
ARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond repute
Default Re: What lasers are used in lasik?

Here's the list of approved lasers in the USA.

List of FDA-Approved Lasers for LASIK

You should be able to find information on one of those lasers somewhere.
ARG is offline   Reply With Quote
Old 05-08-2014, 04:00 AM #3
Lotus_Darkrose's Avatar
Class 3R Laser
 
Join Date: Feb 2009
Location: Michigan
Posts: 1,859
Rep Power: 202
Lotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond repute
Lotus_Darkrose Lotus_Darkrose is online now
Class 3R Laser
Lotus_Darkrose's Avatar
 
Join Date: Feb 2009
Location: Michigan
Posts: 1,859
Rep Power: 202
Lotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond reputeLotus_Darkrose has a reputation beyond repute
Default Re: What lasers are used in lasik?

That's the second scene from that movie I've seen and oh boy, does it look awful.
__________________
<+vk2fro> mines to operate off two SLA batteries
<+GBD> SLAs? whimp
<+GBD> get a 240V variac and some multiplier :P
<+GBD> then you can have some *real* fun
<+vk2fro> on camping trips where do you expect me to plug that in? a gum tree?
Lotus_Darkrose is online now   Reply With Quote
Old 05-08-2014, 04:02 AM #4
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,141
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,141
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: What lasers are used in lasik?

"Typical pulses are around 1 millijoule (mJ) of pulse energy in 10 to 20 nanoseconds." It's right there on wikipedia's LASIK page. It even has a source. You are not very good at research
__________________
A problem well stated is a problem half solved.

Last edited by Cyparagon; 05-08-2014 at 04:04 AM.
Cyparagon is online now   Reply With Quote
Old 05-08-2014, 04:09 AM #5
bobhaha's Avatar
Class 3B Laser
 
Join Date: May 2009
Location: Sydney, Australia
Posts: 3,256
Rep Power: 360
bobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond repute
bobhaha bobhaha is offline
Class 3B Laser
bobhaha's Avatar
 
Join Date: May 2009
Location: Sydney, Australia
Posts: 3,256
Rep Power: 360
bobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond repute
Default Re: What lasers are used in lasik?

Excuse the crudity of my research but I got some information for you.

Seems like the laser ussed is an ArF laser (uses argon and fluorine). It's lases at 193nm and has a relative output power of 60mW.

But while doing research on lasik it shows, as I thought, that the laser output is being pulsed. Seems to be about the 1mJ range for a 10 - 20 nS burst.

This translates to 0.00000001 mW per burst.

If used in CW mode (which is impossible) this translates to 1 x 10^9 mW.... which is more than enough to cut through 5 inches of steel like butter, plus anything else behind it.

If I was to make a guess, I would say that there is most probably about a 1mS delay in pulse output. Which would make the total system capable of 0.00001 mW. So in short the movie scene is BS. As well as the fact that water on the powerpoint (in another room) affects the laser system enough to increase the power of the laser. Maybe add in your report that, the laser has electronics that cleans the incoming power via a UPS and other means, and if a fault if found the laser will not fire until power is restored or the patients eye is correctly aligned with the laser source.

-Adrian
__________________
Lasers!
10.6um - >40W CO2 Laser - 25W RF excited CO2 Laser*
685nm - Being built!
660nm - 250mW LOC PowerLight B50 Host - 100mW WL pulsar
635nm - 430mW C6 Host*
632.8nm - Red He-Ne laser ~1mW
593.5nm - Regal 5
542.8nm - Green He-Ne laser ~2.5mW
532nm - 620mW+ lasersman Firedragon III* - 100mW PGL-III-M from JETLASERS* - 70mW Rayfoss Host*
~~~ - 175mW Rayfoss Host - <5mW WL Core - 55mW DinoDirect review laser*

488nm - On the hoist
473nm - 2x CNI lab lasers ~40mW
445nm - 3W Big Boyz Laser - >1.1W Cree C6 Host - 650mW WL Arctic
405nm - 65mW GLP-405 Aquarius host - 160mW 6x Blu-ray MXDL Host
Total: 71,868.5 mW

Goggles!
Laser glow LSG-532-Sport protective eye goggles OD 7+ 190-532nm HIGHLY RECOMMENDED!!
Jetlasers wrap around 190-540nm OD4+ goggles*
Eagle Pair Red OD4+ goggles
Scopeguy20 Blublockers for 405nm lasers!

* indicates a review has been done, on this item.

Check out my How to Build a Selectable Dummy Load Thread!
bobhaha is offline   Reply With Quote
Old 05-08-2014, 04:52 AM #6
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,141
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,141
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: What lasers are used in lasik?

Quote:
Originally Posted by bobhaha View Post
Seems to be about the 1mJ range for a 10 - 20 nS burst.

This translates to 0.00000001 mW per burst.


You've mixed up your fractions or something because you're off by THIRTEEN ORDERS OF MAGNITUDE. If I were to say the US population was seventeen... or even if I said the universe has existed for two minutes I would be closer to being correct than your statement here.

Seriously... Does this answer even make sense to you? You know lasik works by vaporizing corneal tissue. In your experience, is 0.00000001 mW capable of vaporizing tissue?

Quote:
Originally Posted by bobhaha View Post
If used in CW mode (which is impossible) this translates to 1 x 10^9 mW


What in Rod's name are you talking about? Who is doing your "translating"? Are you just making shit up now? Show your work please.

Quote:
Originally Posted by bobhaha View Post
If I was to make a guess...
Well that settles it. Guessing is "making shit up" in my book.

Quote:
Originally Posted by bobhaha View Post
I would say that there is most probably about a 1mS delay in pulse output. Which would make the total system capable of 0.00001 mW.
Is this an extension of your first calculation failure, or is this something new?

Quote:
Originally Posted by bobhaha View Post
Excuse the crudity of my research
__________________
A problem well stated is a problem half solved.

Last edited by Cyparagon; 05-08-2014 at 05:30 AM.
Cyparagon is online now   Reply With Quote
Old 05-08-2014, 11:08 AM #7
brendon7358's Avatar
Class 2M Laser
 
Join Date: Jul 2011
Location: North Carolina, USA
Posts: 703
Rep Power: 117
brendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond repute
brendon7358 brendon7358 is offline
Class 2M Laser
brendon7358's Avatar
 
Join Date: Jul 2011
Location: North Carolina, USA
Posts: 703
Rep Power: 117
brendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond repute
Default Re: What lasers are used in lasik?

Quote:
Originally Posted by Cyparagon View Post
"Typical pulses are around 1 millijoule (mJ) of pulse energy in 10 to 20 nanoseconds." It's right there on wikipedia's LASIK page. It even has a source. You are not very good at research
What is a mJ? I was looking for mW, I believe I read somewhere that it was pulsed at 300-500hz.
brendon7358 is offline   Reply With Quote
Old 05-08-2014, 06:38 PM #8
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,141
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,141
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: What lasers are used in lasik?

It's right in the sentence, sir. Millijoule. Energy. Power is energy per unit time. If I have a 1mW laser on for one second, the total energy emitted is 1mJ. If I have a 1mW laser on for one minute, the total energy emitted is 60mJ. If I have a 100kW laser on for 10ns, the total energy emitted is 1mJ.

As an advanced placement chemistry student, you should know what energy and power are.
Even if you've fallen behind in your class, these answers are 4 seconds away with Google. You're not trying very hard here.
__________________
A problem well stated is a problem half solved.

Last edited by Cyparagon; 05-08-2014 at 06:48 PM.
Cyparagon is online now   Reply With Quote
Old 05-08-2014, 07:23 PM #9
brendon7358's Avatar
Class 2M Laser
 
Join Date: Jul 2011
Location: North Carolina, USA
Posts: 703
Rep Power: 117
brendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond repute
brendon7358 brendon7358 is offline
Class 2M Laser
brendon7358's Avatar
 
Join Date: Jul 2011
Location: North Carolina, USA
Posts: 703
Rep Power: 117
brendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond reputebrendon7358 has a reputation beyond repute
Default Re: What lasers are used in lasik?

Quote:
Originally Posted by Cyparagon View Post
It's right in the sentence, sir. Millijoule. Energy. Power is energy per unit time. If I have a 1mW laser on for one second, the total energy emitted is 1mJ. If I have a 1mW laser on for one minute, the total energy emitted is 60mJ. If I have a 100kW laser on for 10ns, the total energy emitted is 1mJ.

As an advanced placement chemistry student, you should know what energy and power are.
Even if you've fallen behind in your class, these answers are 4 seconds away with Google. You're not trying very hard here.
Yes, but we have to do an experiment to prove it would not work. Because I do not have an excimer laser I was just going to use a handheld laser, but I need to know what power it needs to be. That's why I needed it in mW not mJ, I understand that 1mJ = 1mW in a second but it's a pulsed laser, so I need to find a way to accurately simulate it with a constant on laser.

I will use this laser as an example, because it gives the following information:
Wavelength: 193nm
Pulse Duration: 8-30 nano seconds
Repetition Rate: 10hz
Fluence (at the eye): 134mJ

1 Nanosecond = 1.0 x 10^-9 Seconds
So to calculate mW per second, 30 nano seconds is 3 x 10^-8 seconds and it would be repeated 10 times in a second, according to my calculations this would be in the MW... Or it would be very small (.00004mW), I must be doing something wrong here.

Last edited by brendon7358; 05-08-2014 at 07:24 PM.
brendon7358 is offline   Reply With Quote
Old 05-09-2014, 05:23 AM #10
Class 2M Laser
 
Join Date: May 2009
Posts: 955
Rep Power: 1542
LSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond repute
LSRFAQ LSRFAQ is offline
Class 2M Laser
 
Join Date: May 2009
Posts: 955
Rep Power: 1542
LSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond repute
Default Re: What lasers are used in lasik?

Lets not forget spot size. It's focused at the just past the corneal surface. This makes it a peak energy per unit area problem. In fact the Fluence (cough,, hint... cough) gets so high that it becomes a ablation, not a combustion, method of removing the tissue. So a low AVERAGE power works just fine for Lasik. In this case the pulse has a very high PEAK power, which is what can be misleading to a person new to the calculations. Besides, even if you drilled through the cornea, the deep UV energy gets partially adsorbed in the Aqueous Humor. The AH is 98 per cent water, and the novice chemist should easily be able to prove that it would take a long, long, time to boil that water. (hint two, its not just the water that adsorbs, its really the other 2%, but does it adsorb enough?) Change the wavelength to say 532 or 1064 nm where the mix is transmissive, and then... well, ouch. The audible shockwave of a plasma breakdown in the AH would be un-nerving to say the least.

Things to Google include Ablation and Latent Heat of Vaporization.... Aka Enthalpy of Vaporization....

If you understand Calculus, the basis of Lasik, per pulse, is the very high Delta Energy over the very short Delta Time.

At least you did not pick this scene:

Real Genius (8/8) Movie CLIP - Jerry's House of Popcorn (1985) HD - YouTube

Some things to look at:

Laser (peak) Fluence, Intensity and Power - LIDARIS

Sensor Finder | Laser Fluence calculator - Ophir

"Adsorption Curve"

I'd show your math and cite your sources.

If you get a bad grade and need to defend yourself, find the very common book:

Safety with Lasers and Other Optical Sources: A Comprehensive Handbook
by David Sliney, M.L. Wolbarsht

The math in S&W is very basic. It grows mold on the shelves of most University and some Public libraries. I've yet to meet a university library that would deny you access for a academic project. If you are unsure, your local University Laser Safety Officer might also take your call.


Steve (Former pulsed laser service engineer)

Last edited by LSRFAQ; 05-09-2014 at 06:17 AM.
LSRFAQ is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 05:16 AM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC