Re: FS: >80mW Blu-Rays, two models: GONE!
Timbojames said:
yeah that's a bit strange. The 6x blu-ray's are close to the output of 18x red's, how's that possible?
Why wouldn't it be possible? Just a week ago i was reading the datasheet of a 1W 405nm diode. It was multimode, and the 1W power was max peak power, but still!
I don't know how, but i can tell you why.. A Blue Ray disk holds an enormous amount of information. There are many more microscopic dots on the surface, where the laser has to create a change, to write data, than o a DVD, even tho the surface is the same.
For the drive to write all this info to the disk in a "humane" amount of time, the laser has to be very powerful. The faster the disk spins, the less time the laser has, to create the damage on it's surface. So it has to be more powerful.
And then, there are all the losses in the MANY optics inside the sled. The power is reduced a lot, before the beam ever reaches the disk. Especially, if some of the lenses should be plastic! And at the last step, part of the beam is obstructed with an LCD window, to give it the perfect shape, to write the microscopic dot.
We are using the total power of the diode, weird shape beam and all, and with only one lens in between. Make that lens good, and you have a very powerful laser..
Another factor is reliability. A diode is meant to work within it's ratings for a VERY long time inside a computer drive. To achieve this, it has to be capable of much more, than is actually needed.
But we are driving them close to the edge, of what they are capable of. So we get more power at the expense of a shorter life, and sometimes, risk of instant failure....
Igor, you just know to get me more and more excited every time! [smiley=beer.gif]
Hehe.. Well, i'm excited myself!
Well, i sure hope so.
