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 > Science & Lasers



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



Reply
 
LinkBack Thread Tools Display Modes
Old 07-24-2010, 03:57 PM #1
Junior Member
 
Join Date: Jul 2010
Posts: 4
Rep Power: 0
pobri19 is on a distinguished road
pobri19 pobri19 is offline
Junior Member
 
Join Date: Jul 2010
Posts: 4
Rep Power: 0
pobri19 is on a distinguished road
Default Laser science questions (beginner)

Hi guys, I'm reading up on lasers and what they are/how they work to get a better understanding of what I'm going to be diving into. Is my understanding right? Feel free to correct whatever I'm saying incorrectly or raise significant points By the way keep in mind this is coming from someone with zero physics background, so I wouldn't be surprised if I'm way off.

Electrical current is 'pumped' through the diode to raise the energy level of the atoms (excite them) so they emit photons, these photons then hit the excited atoms, these excited atoms will then release another photon of the same wavelength in the same direction and so on, until a lot of photons are released in the same direction producing the laser beam.

However, if my understanding is correct, what I want to know is, how is it ensured the the beam is going in the right direction? I.e straight out the end of the laser (opposed to it bouncing off in a different direction from the diode).

And how are these photons reflected in the diode as to produce a stronger beam (I read that partially reflective mirrors (output couplers) are used in some setups to bounce the protons back and fourth through the medium to increase the size of the beam by exciting more atoms with the protons).

Are they not reflected in the diode? Is it a single stream of protons that aren't replicated inside the diode like a mirror setup would do?

Thanks!


pobri19 is offline   Reply With Quote







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







Old 07-24-2010, 04:03 PM #2
Fonduman's Avatar
Class 2 Laser
 
Join Date: Jun 2010
Location: Northern Ireland
Posts: 356
Rep Power: 12
Fonduman is a jewel in the roughFonduman is a jewel in the roughFonduman is a jewel in the roughFonduman is a jewel in the rough
Fonduman Fonduman is offline
Class 2 Laser
Fonduman's Avatar
 
Join Date: Jun 2010
Location: Northern Ireland
Posts: 356
Rep Power: 12
Fonduman is a jewel in the roughFonduman is a jewel in the roughFonduman is a jewel in the roughFonduman is a jewel in the rough
Default Re: Laser science questions (beginner)

a basic model (but probably doesnt happen in solid state diodes) is a tube with a mirror at one end and the other end has a semi reflective sheet (so some can pass through as the laser beam) so theres a degree of the light that keeps passing between the mirrors to help stimulate further emission. i believe (but not certain) that this is how the first ruby laser worked.

the lense focuses the light coming out of the diode: its not all going the same direction until its focused.
__________________
Just starting off my collection. Currently have:
150mW 405nm from O-like *outputting 156mW quite stable*
Jayrob SS 18650 kit, A140 diode at 1A putting out 900mW
100mW 532nm from dealextreme *broke*
500mW 532nm from O-like *lense dmg? down to 150mW with scatter*

200mW waterproof 650nm from O-like *outputting 210mW quite stable*
Plan to have soon:
1W 455nm from wicked lasers (ofc)

01010000011000010111001101110100011000010010000001 10111000100000011100110110000101110101011000110110 01010011101000100000011010010111010001110011001000 00011000010110110101100010011010010110011101110101 01101111011101010111001100100001
Fonduman is offline   Reply With Quote
Old 07-25-2010, 09:41 PM #3
ossumguywill's Avatar
Class 3R Laser
 
Join Date: Jul 2008
Posts: 2,138
Rep Power: 55
ossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond repute
Send a message via AIM to ossumguywill Send a message via Skype™ to ossumguywill
ossumguywill ossumguywill is offline
Class 3R Laser
ossumguywill's Avatar
 
Join Date: Jul 2008
Posts: 2,138
Rep Power: 55
ossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond reputeossumguywill has a reputation beyond repute
Send a message via AIM to ossumguywill Send a message via Skype™ to ossumguywill
Default Re: Laser science questions (beginner)

Yep-the photons bounce back and forth between a mirror and semi-reflective sheet. And if you look at the output of a laser diode, it's not focused. The reason a gas laser has a tight beam and a diode has a divergent beam is because of the length of the lasing cavity compared to the width. A diode has a short and fat cavity while a gas laser has a skinny and long cavity.
ossumguywill 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 08:18 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