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803T optics breakdown...

L

LikeitBright

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I'm curious about the optical components in this sled.  I've taken a photo and numbered key optical components and what I think they are and how they function.  Any input is welcome....

1. 405nm laser diode
2. 650/780nm laser diodes
3. Waveplate, collimation optics, diffraction grating?
4. Polarising beam splitter cube used to combine LD beams
5.  Mirror (50%R at 405/650/780nm) which send 50% of light to final mirror before the objective lens.  Transmits 50% return light?
6.   Final mirror, broadband or specific to 405/650/780nm probably
7.  The objective lens, f~+2mm : after optic 6 is a lens (plastic, AR coated, f=+25mm), then an LCD with electrical connects and then another flat/window optic - perhaps a 1/4 wave-plate.
8. Some sort of light collection optic- definitely a lens in there - plastic?
9. The photo-detector.
 

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FireMyLaser

FireMyLaser

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Number 3 and 5 works like a diffraction grating. The violet LD also has one. Number 8 is some sort of oval lens, it makes my x-125 beam oval. Probably improving the LD beam spec or something.
 
M

Murudai

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You can haz repz ;D

Great diagram, I'll be referring to it when I butcher some sleds so I know what's valuable :) But it would be great if some other people could come and confirm your findings :)
 
Zom-B

Zom-B

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#3. can be rotated and I think it is possibly for calibrating the wavelength (as gratings do such things) creating three beans for tracking

What you're missing is everything between the 90° mirror and the objective lens. (i see now that you did/do mention them (i can't tell if you added them later, bad memory)) There are two more optics there, an LCD for wavefront aberration correction and a quarter-wave plate and another collimating lens
 
Zom-B

Zom-B

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I've analyzed the basic optics more thoroughly.

The PBS cube is transparent for RED and IR always, and reflects between between 5% and 95% of violet depending on polarization. For green, it seems to reflect between 1% and 10% depending on polarization.

The long mirror is for all three intended wavelengths exactly 50% reflective, non polarized, non dichromatic. For green, it is totally useless as internal reflections create a strange fanning/repeating reflection. So ultimately it is dichromatic, but not in a usable sense.

The 90° mirror is of course reflective for all intended colors, but not for green. Again, internal reflections make it useless for this wavelength.
 
L

LikeitBright

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This is good stuff  :)  Yes I noticed the LCD and what is probably a quarter wave plate between the final mirror and objective lens - the objective being a very short focal length aspheric lens of some sort I expect...?

It makes sense optic 5 is a beam splitter for all the LD wavelengths.  This way sufficient power is sent to the CD/DVD media and enough light also makes it back to the light collection optic (8) and photo detector (9).  What is the point of the grating (3) in front of the LD?  Is it to create three laser dots for tracking..?
 
artix

artix

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How do I get it out? I just got my PHR 803T sled and I can see everything inside but I CANT GET IT OUT! :(
 
L

LikeitBright

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Well the 405nm diode is in its heatsink which is held to the chassis with an adhesive. You can gently pry the 405 diode in its heatsink away from the sled. Then you can use two sets of plyers to take ahold of opposite sides of the 405 diode heatsink and carefully twist to break the heatsink in half and extract the diode. At least thats one way. Be careful....
 
artix

artix

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LikeitBright said:
Well the 405nm diode is in its heatsink which is held to the chassis with an adhesive.  You can gently pry the 405 diode in its heatsink away from the sled.  Then you can use two sets of plyers to take ahold of opposite sides of the 405 diode heatsink and carefully twist to break the heatsink in half and extract the diode.  At least thats one way.  Be careful....
Click to expand...

OK! That sounds easy! (I'll do it when I get my Kryton Groove)
 
LRMNmeyer

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I'll remember to look at this when I get my sled. Thanks, it will be very helpful.
 
phoenix77

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Whenever I get a sled, (after removing the 405nm diode 1st)I usually disassemble the whole sled, & anything that looks like an optic of some form, or lens or mirror all get removed. I have one of those 7 DAY reminder boxes for medication, & I separate all the different pcs. into different 'days' mirrors go in the MON. box, the long glass, 4 sided bars go into the TUE. box, & so on. I've got quite a collection going here. I don't know what I'll do with them yet but if I or somebody else finds a use for one or more of the optical pcs. in the sled, I'll be pretty well set for whatever that may be. If nothing comes up for using these pcs. well they don't take up much room,& I'll have pretty glass pcs. & mirrors to play with ;D ;D rob :cool:
 
mikeeey

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how powerful are the 650/780nm laser diodes that are in this sled?
 
mikeeey

mikeeey

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Chad said:
[quote author=mikeeey link=1217204986/0#13 date=1221454202]how powerful are the 650/780nm laser diodes that are in this sled?
Click to expand...

1-3mWs. They aren't burner diodes. [/quote]
grrrr.
O well..
 
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