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445 nm window break...

Hiemal

Hiemal

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Well, I'm keeping it then. I'll let you guys know if it degrades at all or dies. (I haven't opened the lens since I pressed it back into the module, and have tested it just about every day with no changes in output)
 





BShanahan14rulz

BShanahan14rulz

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Wow, is this coated facets implementation something we've come across more recently because of the higher power handling, or is it something that mostly all of our common diodes use?
 
pullbangdead

pullbangdead

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BShanahan14rulz said:
Wow, is this coated facets implementation something we've come across more recently because of the higher power handling, or is it something that mostly all of our common diodes use?
Click to expand...

I'm pretty sure most of the commercial diodes have coated facets, it's nothing new. I've only ever looked at the 445nm diodes that closely to see it myself, so I'm not certain about any others in particular.
 
Hiemal

Hiemal

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What do coated facets look like up close? Just, shiny like glass or something?
 
pullbangdead

pullbangdead

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Le Quack said:
What do coated facets look like up close? Just, shiny like glass or something?
Click to expand...

You'll see a color due to interference. Like the rainbow of colors you see when there's a layer of oil on water, the colors are due to interference, and the color depends on the thickness of the film. There's a rainbow effect with oil-on-water because the thickness is different everywhere.

for example: laser diodes often use a coating (or set of coatings, to be more precise) that acts as a mirror for the wavelength of light of that laser. When you look at the facet of a blue laser diode, it will often look blue-ish, because the coating is designed to reflect blue light.

If there's no facet coating, there's no interference, so you'll see no color.
 
BShanahan14rulz

BShanahan14rulz

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Ah, it would seem that most of the lasers we use have coated facets, then! Based on the above description, I know I've seen an LOC with a shiny colored (blue, I think :thinking: ) facet, as well as several random "flat package" diodes. Is the rear facet transmissive to a lesser extent too?
 
C

conundrum

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Does this mean filling a diode with liquid (ie ultrapure DI water or glycol) would increase its current handling ability?

This would be an interesting experiment.
-A
 
AnthoT

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conundrum said:
Does this mean filling a diode with liquid (ie ultrapure DI water or glycol) would increase its current handling ability?

This would be an interesting experiment.
-A
Click to expand...

Filling a diode with liquids would short every tiny wire inside the diode..........
 
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JLSE

JLSE

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AnthoT said:
Filling a diode with liquids would short every tiny wire inside the diode..........
Click to expand...

Not necessarily true.. A beam can pass through mineral oil and still
have lots of energy on the other side of the container.

Mineral oil is also non conductive.. The only thing you would have to worry
about is how clean the oil is from particles, and if it would have any
harsh effect on the gain medium and materials that make up the die.

Still an interesting idea..


 
Last edited:
J

joeyss

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It would also make heat issues non existent....anyone willing to try this with some cheap red diodes?
 
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