Talk:Laser diode
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[edit] HeNe in Laserdisk players
Were Helium Neon lasers used in early CD players, or just laserdisks? --Slashme 11:12, 19 December 2005 (UTC)
- If the information in the Compact disc article is correct, HeNe's couldn't have been used for CDs. the CD article says that the pits are 1/2 of the 780 nm LD wavelength, whereas the shortest emission wavelength from the HeNe is 633 nm. Presumably Philips' earliest audio laser discs would have been designed for HeNe's but the discs made for those systems wouldn't be compatible with today's CDs. If it's true (please cite sources), it might be reasonable to say that "laser diodes have replaced HeNe lasers in laser disc players, which were originally designed for the larger gas lasers" or something like that.
- --The Photon 04:28, 20 December 2005 (UTC)
That's a very far fetched interpretation. While HeNe lasers almost certainly have been used in one way or another to develop the technologies that enabled CD consumer devices and to study prototypical data storage and retrieval in test systems they would have never been used with CDs simply because they have not been miniaturized from their bulky fragile implementations into something of practical relevence to a consumer product.
- Laserdisc players were mass produced (more or less) with HeNe's. So it wasn't at the time impossible in principle to make a HeNe-based consumer device. The question, not yet answered, is, have Laserdisc players been built with diode lasers replacing the HeNe's? -- The Photon 01:58, 5 August 2006 (UTC)
[edit] Multi-wavelength Diode Lasers
With the advent of BluRay and HD DVDs there is a need for multi-wavelength diode lasers to read/write not only these discs but also red DVD and IR CDs. I think these are for now hybrid modules with multiple laser diodes and detectors on an optical pick-up. While these are magnificent examples of miniaturisation they are delicate and yields muct be low. Anyone have any info on what the industry is doing about this?
I am sure they will ultimately be monolithically integrated but this is a tall order given how dissimilar the laser structures are. This may be a stumbling block for the expansion of the HD DVD market IMO. Royzee 12:36, 1 February 2007 (UTC) Feb 1 2007
[edit] how it works
This article does not tell how the diode laser actually works... what is the process in which a laser beam is created in this setup that is different than a regular diode... —The preceding unsigned comment was added by 84.94.198.180 (talk) 23:40, 8 February 2007 (UTC).
