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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Active surface of a laser diode?
For self-education I decided to take apart a presumably defunct DVD laser
unit to see the internal layout of splitters etc and what the laser diode looks like. Googling in images I only find graphics or external views, anyone know of a WWW view through the window of some good laser diodes ?. Looking via x30 at what I assume to be the active surface is a uniform grey colour and uniform crystalline appearance rectangular face (ie no obvious hot spot/s) like a finer grained version of a fractured surface of cast aluminium or monkey metal. Is this the infamous Catastrophic Optical Damage ? This one has a marking of RH on the body. |
#2
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Active surface of a laser diode?
So if the active surface of this pic , (different internals to the one I
have looked at ) http://img98.imageshack.us/img98/754...cc5bb59e9b.jpg is the uppper part of the die then the same grey granular appearance |
#3
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Active surface of a laser diode?
Den 01-04-2013 13:56, N_Cook skrev:
So if the active surface of this pic , (different internals to the one I have looked at ) http://img98.imageshack.us/img98/754...cc5bb59e9b.jpg is the uppper part of the die then the same grey granular appearance How about the small 'rod' that the 4 bonding wires from the right pin goes on top of? -- Uffe |
#4
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Active surface of a laser diode?
On Apr 1, 7:56*am, "N_Cook" wrote:
So if the active surface of this pic , (different internals to the one I have looked at )http://img98.imageshack.us/img98/754...cc5bb59e9b.jpg is the uppper part of the die then the same grey *granular appearance I think the laser diode is the long gold bar with four wires going to it. I'm not sure what the silver cube next to it is.. a temerature sensor? The whole thing is on some substrate.. maybe Alumina or Silicon?? The emitting area of a laser diode is really tiny. George H. |
#5
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Active surface of a laser diode?
"N_Cook" wrote in message ... So if the active surface of this pic , (different internals to the one I have looked at ) http://img98.imageshack.us/img98/754...cc5bb59e9b.jpg is the uppper part of the die then the same grey granular appearance The "active surface" is a channel through the die, there's a tiny aperture in the middle of that "granular surface". |
#6
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Active surface of a laser diode?
Ian Field wrote in message
... "N_Cook" wrote in message ... So if the active surface of this pic , (different internals to the one I have looked at ) http://img98.imageshack.us/img98/754...cc5bb59e9b.jpg is the uppper part of the die then the same grey granular appearance The "active surface" is a channel through the die, there's a tiny aperture in the middle of that "granular surface". Smaller than the resolution of that photo or the small blackish rectangle on the end of the "bar" that ends flush with the granular surface, on a line between the centres of the end faces of the conductor pins. Dimensions of that rectangle about one of those wires diameter x about 4 wire diameters |
#7
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Active surface of a laser diode?
"N_Cook" wrote in message ... Ian Field wrote in message ... "N_Cook" wrote in message ... So if the active surface of this pic , (different internals to the one I have looked at ) http://img98.imageshack.us/img98/754...cc5bb59e9b.jpg is the uppper part of the die then the same grey granular appearance The "active surface" is a channel through the die, there's a tiny aperture in the middle of that "granular surface". Smaller than the resolution of that photo or the small blackish rectangle on the end of the "bar" that ends flush with the granular surface, on a line between the centres of the end faces of the conductor pins. Dimensions of that rectangle about one of those wires diameter x about 4 wire diameters There are various laser tutorials online with exploded view representations of the junction structure - that's where I got all I have. |
#8
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Active surface of a laser diode?
"N_Cook" wrote in :
For self-education I decided to take apart a presumably defunct DVD laser unit to see the internal layout of splitters etc and what the laser diode looks like. Googling in images I only find graphics or external views, anyone know of a WWW view through the window of some good laser diodes ?. Looking via x30 at what I assume to be the active surface is a uniform grey colour and uniform crystalline appearance rectangular face (ie no obvious hot spot/s) like a finer grained version of a fractured surface of cast aluminium or monkey metal. Is this the infamous Catastrophic Optical Damage ? This one has a marking of RH on the body. If it is a visible light laser diode, just use a lens to produce an image of the chip on your wall. That is safe to look at, and shows the light distribution. |
#9
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Active surface of a laser diode?
Sam would likely know. Nice picture.
-- Cheers, WB .............. "N_Cook" wrote in message ... So if the active surface of this pic , (different internals to the one I have looked at ) http://img98.imageshack.us/img98/754...cc5bb59e9b.jpg is the uppper part of the die then the same grey granular appearance |
#10
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Active surface of a laser diode?
Sjouke Burry s@b wrote in message
2.10... "N_Cook" wrote in : For self-education I decided to take apart a presumably defunct DVD laser unit to see the internal layout of splitters etc and what the laser diode looks like. Googling in images I only find graphics or external views, anyone know of a WWW view through the window of some good laser diodes ?. Looking via x30 at what I assume to be the active surface is a uniform grey colour and uniform crystalline appearance rectangular face (ie no obvious hot spot/s) like a finer grained version of a fractured surface of cast aluminium or monkey metal. Is this the infamous Catastrophic Optical Damage ? This one has a marking of RH on the body. If it is a visible light laser diode, just use a lens to produce an image of the chip on your wall. That is safe to look at, and shows the light distribution. I went the "unsafe " route and put 2.5V and 560R over the 1.6V DVM diode test junction ( 1.3V of the other pair of pins of this recordable DVD laser). The dim and dull-red light came from the junction between the grainy block surface and the pillar . In my one the end of the pillar is a "polished" surface with no metalisation over it unlike the one in that pic. |
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