Laser technology - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

Reply
 
Thread Tools
post #11 of 17 Old 10-30-07, 04:28 PM
Plain ole user
 
lcaillo's Avatar
Tech Guru
 
Join Date: May 2006
Location: Gainesville, FL, USA
Posts: 11,121
Send a message via AIM to lcaillo
Re: Laser technology

Everything you could ever want to know about lasers, and everything else about electronics can be found here:

http://www.laserfaq.org/sam/odfaq.htm

and

http://repairfaq.ece.drexel.edu/sam/lasersam.htm

and in general about electronics

http://www.laserfaq.org/sam/samsites.htm




Looking for me, just google my username. I have used the same one for most sites for many years.
lcaillo is offline  
Sponsored Links
Advertisement
 
post #12 of 17 Old 11-05-10, 02:01 PM
Shackster
 
torceador's Avatar
 
Join Date: Sep 2010
Posts: 67
Re: Laser technology

Sonnie,

The laser itself doesn't decode anything. It is a source of coherent (all traveling the same way) light that can be focused onto a very small dot onto the medium, where there are either shiny spots or pits. So one reflects, the other doesn't. If you look at a laser tray for a CD, DVD, or Blu-Ray player, the laser output gets focused onto the media by a lens sitting in a voice coil (just like a speaker) that can be moved slightly up and down. The beam is reflected back through the same lens and hits a beam splitter that bounces the reflected beam onto a photo diode that does the job of deciding if it is a one or zero.

Optical disk technology was pretty much lab stuff until 1978, when DiscoVision (later LaserDisc) hit shelves. In 1982, the CD format was introduced. By today's standards, these are pretty ho-hum. They used an infra-red laser at about 780 nm to focus onto the disk. In the mid nineties, the DVD added a lot more density by making the spot smaller. It did this by using a red (~630 nm) laser that could be focused to a smaller dot. Blu-Ray beat that recently by going to the newly-invented 405 nm diode from Nichicon.

As soon as we exhaust X-rays, gamma rays, and cosmic rays (assuming we can create a solid state diode that can be excited with a lot of power) , we ought to be at our wits end for improving our home theater experience, but we'll only have to buy one disk that would contain all the movies ever made (see, I made a joke, here)

torceador
torceador is offline  
post #13 of 17 Old 11-05-10, 07:14 PM
Moderator Emeritus
Don
 
Join Date: Oct 2007
Location: Central PA
Posts: 3,772
Re: Laser technology

Does anyone know what the status is for true holographic (storing data in three axes) storage?
Harpmaker is offline  
 
post #14 of 17 Old 02-24-11, 11:48 AM
Shackster
 
Join Date: Feb 2011
Posts: 6
Re: Laser technology

great topic indeed, yeah laser technology is on of the most sophisticated out there!
heart_sniper27 is offline  
post #15 of 17 Old 06-03-11, 04:14 AM
 
SocyFisher's Avatar
SocyFisher
 
Join Date: May 2011
Location: 1360 Amethyst Drive Lansi
Posts: 20
Re: Laser technology

I learn a lot from you. Now there is something to talk about in your Physics class. Now, i learn something new.
SocyFisher is offline  
post #16 of 17 Old 06-15-11, 04:20 AM
Elite Shackster
 
robbo266317's Avatar
bigbadbill
 
Join Date: Sep 2008
Location: Newcastle Australia
Posts: 5,771
Re: Laser technology

Quote:
Harpmaker wrote: View Post
Does anyone know what the status is for true holographic (storing data in three axes) storage?
The simplest answer is that it still hasn't been fully developed viably for commercial use. http://en.wikipedia.org/wiki/HDSS

Silence is golden but duct tape is silver.

DIY completed:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
robbo266317 is offline  
post #17 of 17 Old 06-15-11, 08:25 AM
Shackster
joeydrunk
 
Join Date: Jun 2011
Location: WA STATE
Posts: 13
Quote:
Sonnie wrote:
I've often wondered exactly how some laser can pick up an audio and video signal and actually transfer it to sound and picture. Sounds like it would be complicated. Can anyone explain it in layman terms?
Lasers can not only read the information as in a cd or DVD but is now able to carry the information, they've recently made a laser hdd Wich we will be seeing in the somewhat near future implemented in our computers. The storage and bandwidth is huge compared to anything we have now. The only only downside at present is it can only be written to 1000 times before it's garbage.
joeydrunk is offline  
Reply

Bookmarks

Tags
laser , technology

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may 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 is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome