fried diode

[paul1598419]

I misspoke. I set the current for 470mA, not 700mA. Still, DTR sets his for 450mA and I'm wondering if that extra 20mA is power I don't need and should set it to 450mA. I figured it would probably be alright at 475mA which is where I initially set the current for. Then I was checking it out to make sure the current was still where I set it and it hadn't changed at all, but I cranked it back to 470 just because. I have a great G-2 lens for it and wanted to make sure I get at least 700mW power out. Any one think that 470mA is too high and I should set it for 450mA?

 

[Devil_Master]

OK, a photon is considered to be a particle and a wave (But not a desert topping...), so, when its a particle, it is traveling at the speed of light, so, a particle CAN reach the speed of light, because it IS light in this case.

That's why I wrote "a material particle": to exclude the photon.

I have a very analytical mind, and I like things to make sense. When the click happens and all the information falls into place, that is always a nice moment.

I understand that completely, it does feel good when you really "grok" a theory, as opposed to merelyreciting it because it's written in a book.

I could suggest some books? Ifor you'd like I'll just contact you privately for that

Just don't suggest a high school physics book, or you risk to make him hate physics. About six months ago I re-read my high school physics book, and everything was so sloppy, unnecessarily complicated or with actual mistakes, that I felt the urge to slam it against a wall or throw it out of the window.

 

[xirrious]

You have bosons which are force carrying particles such as the photon and hadrons which are you so called material particles that make up matter. Bosoms are simply the particle aspect of the wave that carries electromagnetic energy and the energy of the other three forces. You have the graviton. All sorts of other bosoms also associated with the strong and weak nuclear forces and then gravity for the former mentioned boson.

 

[Teej]

You have bosons which are force carrying particles such as the photon and hadrons which are you so called material particles that make up matter. Bosoms are simply the particle aspect of the wave that carries electromagnetic energy and the energy of the other three forces. You have the graviton. All sorts of other bosoms also associated with the strong and weak nuclear forces and then gravity for the former mentioned boson.

So maybe 450 ma is about right and 470 is too high?

 

[paul1598419]

Hey guys, anybody ever heard of the Bowes- Einstein condensate? Light can be slowed down to several meters a second or even stopped and restated. It has nothing to do with a photon being absorbed and redistributed. It is a function of the electromagnetic field of bosons and the refraction indices.

 

[xirrious]

I'd go with 430ish ma for longevity. And to the above post yes I've read quite a bit on the topic. Photons don't always travel at the speed of light. Depends on the medium obviously. Einsteins condensate is a theoretical aspect of empty space I believe? Don't quote me on that.. I'm a physics guy but I don't claim to know everything.

 

[xirrious]

Also the boson for the electromagnetic field is the photon. It's also its own anti particle.and also the universes standard quanta of energy. Virtual photons pop in and out of existence at a furious rate on quantum scales. This is where hawking radiation comes from. And also the particle way of explaining the "quantum foam" and quantum fluctuations of the electromagnetic field that makes up the cosmic background radiation which has in turned provided near proof of inflation theory.

Also it's Bose-Einstein condensate. BEC for short

Also one last thing. I have been using hadron as the term for particles that make up matter. Technically they're called fermions. Fermions obey the Pauli exclusion principle which bosons do not which is why matter does not collapse under the natural forces. Basically stated it says no two fermions can share the same state. Mostly important would be their position . This is why heat is produced when matter is squeezed. The fermions within obey this principle and frantically jiggle around faster and faster depending on outside pressure thus creating heat.

 

[paul1598419]

Yeah. I hadn't thought about it for some time and got the Bose spelling incorrect, but it is far from theoretical. The condensate was first demonstrated in 1999 if my memory serves me correctly. I believe the University of Colorado also demonstrated it, which was interesting to me because I went to the Denver branch. I would have to look up the math for this as it has been a few years since I spent any time with the new state of matter. That's what I get for relying on my memory for details. Also it has nothing to do with empty space, it is an element cooled very close to absolute zero. At this temperature the Bose-Einstein condensate become a totally new phase of matter. The individual atoms coalesce into a mass of atoms that occupy all of the space together at once. Or, better stated, the atoms lose their individual space and all occupy the space together as one. The condensate has other peculiar properties such as being able to move through matter as if it was not there and able to contain it. And, there is the slowing of light through the condensate to such a speed that one would actually be able to watch it move if it weren't confined to such a small space.

 

[xirrious]

It's part of a thoery... People assume theory means it's just a guess. A true theory isn't a theory without physical experimental proof. Before that it's just hypothesis. Just because I called it a theory doesn't mean I don't take it as factual. Not all theories are correct. Einsteins theory of relativity is a hundred times more accurate at making prediction then newton's gravitational "laws". Most folks misinterpretation of theories kind of upsets me a bit lol.

The standard of theory is dropping though now. Mathematical proof seems to be enough these days. String theory for instance. However we have found the Higgs boson at CERN recently.

 

[paul1598419]

My mistake. I was reading your post as a theoretical aspect of science instead of a scientific theory. yes, just as the shape of the earth is a theory the Bose-Einstein condensate is a theory of science, also.

Yeah. Saw that the Higgs Boson was discovered at CERN.

 

[xirrious]

Am I dealing with a scientist here? Most folks on LPF know tons about lasers but not many of us around here know much about physics other then the practical aspects applied to lasers of course lol.

But this thread is about a fried 405 diode. I'm ordering a 405 and 650 from laserbtb soon I'm very excited. Also a member here is building me a custom 405. I love e 405nm they have a special look to them. It's also neat having a "black light laser"

 

[paul1598419]

I'm in the process of building a 405nm laser, hence the questions about the current. I think I will leave it at 470mA. Many diodes have lived long lives at 450mA and I really can't see 20 extra mA causing that much trouble. I may be proven wrong, but that remains to be seen.

 

[xirrious]

Your probably right. And with 405nm low visibility more power=better IMO

 

[paul1598419]

Yeah. I've got some heat sink compound that I made just for this build. It is silicone based thermal heat sink compound with equal amounts of synthetic diamond powder crystals with a diameter of 60-100 microns. The diamond crystals (especially synthetic) have a thermal conductivity of 3300 watts/ meters-degrees Kelvin. Compared to copper which has a thermal conductivity of 401 W/mK, or silver which is 429W/mK, diamond is very thermally conductive. The C11 has a large heat sink and a set screw, so I think I will get the best heat dispersion with this combination than with anything else.

 

[xirrious]

Yeah thermal paste made for water cooling cpu and gpus is the best to use. Why are you diluting it with silicone based material?

Edit. Never mind i read your post wrong. Arctic silver is the brand most folks use for their computers. I'd use that or a similar brand. The smaller the diamond crystals the better and the more of them the better too obviously.

 

[paul1598419]

Yeah. These are small crystals. I needed a vehicle to hold the diamonds together, thus the thermal heat sink compound. I could use a silver thermal compound instead, but the thermal conductivity of diamonds are so great, that I doubt it would make any difference. Diamonds have the highest thermal conductivity of any element, bar none. There are some silicon carbide crystals that get close, but diamonds are still better. I've got the compound now, and just need a new module for me to finish this thing. I'd have it by now, if it weren't for the USPS who took my 2 day priority mail and sent it to the wrong coast. I live on the Washington Pacific coast and they sent it to New York. I'm so pissed I could spit.

BTW, arctic silver isn't as thermally conductive as the manufacturers would have you think. They list the thermal conductivity, but changed the units to W/mC. By changing the temperature to Centigrade from Kelvin, they get a higher number, but it is false advertising IMO.