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Old 01-07-2014, 10:14 AM #1
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Default An interesting CD/DVD optics group

Hi, I just wanted to show you a photo of an optical group I removed from a CD/DVD reader (or burner). I have no idea where it comes from, because I removed it years ago, and the original reader has long been thrown away.
I think it's interesting: it's fairly big, all metal, and has a lot of exposed crystals/mirrors/prisms/lenses. Most of the groups I see these days are plastic, all enclosed, and there are few visible crystals.
Does anyone have an idea what kind of reader this comes from? Are any of those crystals actually interesting?


Cristian
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Old 01-07-2014, 12:25 PM #2
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Default Re: An interesting CD/DVD optics group

I uhh.. I'm not too sure, but I think there might be a dichro in there. It was a CD/DVD reader so there were probably two laser diodes in there, an IR for the CD and a red for the DVD. They probably aligned the two so that the lasers came out of the same lens, as it were.
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Old 01-07-2014, 02:04 PM #3
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Default Re: An interesting CD/DVD optics group

And also a PBS cube
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Old 01-07-2014, 03:15 PM #4
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Default Re: An interesting CD/DVD optics group

Yes, there are two lasers. A laser and its detector are on the left of the photo, and another laser with its detector are on the bottom. I suppose the beams are combined/directed by that weirdly shaped prism in the middle, which directs the beam to the final mirror pointing down.

One of the beams is split by a crystal cube; the other is split by a dark red mirror...
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