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Old 03-05-2012, 06:26 PM #17
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Default Re: 445 nm window break...

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)


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Old 03-05-2012, 09:24 PM #18
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Default Re: 445 nm window break...

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?
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Old 03-06-2012, 08:46 AM #19
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Default Re: 445 nm window break...

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Originally Posted by BShanahan14rulz View Post
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?
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.
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Old 03-06-2012, 02:30 PM #20
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Default Re: 445 nm window break...

What do coated facets look like up close? Just, shiny like glass or something?
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Old 03-06-2012, 06:42 PM #21
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Default Re: 445 nm window break...

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Originally Posted by Le Quack View Post
What do coated facets look like up close? Just, shiny like glass or something?
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.
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Old 03-08-2012, 05:22 PM #22
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Default Re: 445 nm window break...

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 ) facet, as well as several random "flat package" diodes. Is the rear facet transmissive to a lesser extent too?
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Old 05-09-2012, 10:36 PM #23
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Default Re: 445 nm window break...

sorry double post, please remove

Last edited by conundrum; 05-09-2012 at 10:37 PM. Reason: see above
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Old 05-09-2012, 10:36 PM #24
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Default Re: 445 nm window break...

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.
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Old 05-09-2012, 11:04 PM #25
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Default Re: 445 nm window break...

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Originally Posted by conundrum View Post
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
Filling a diode with liquids would short every tiny wire inside the diode..........
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Old 05-10-2012, 12:29 AM #26
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Default Re: 445 nm window break...

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


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Old 05-10-2012, 01:43 AM #27
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Default Re: 445 nm window break...

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