Rayfoss 635nm lasers - Possibly better divergence?

• Nov 19, 2011

• #1

AAlasers

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Here we have three 635nm lasers, from rayfoss.
They all advertise 1.2 milliradians of divergence.

www.rayfoss.com

www.rayfoss.com

www.rayfoss.com

Perhaps they are using corrective optics? If they are, they are well worth the slightly higher prices they charge.

AAlasers

 

• Nov 19, 2011

• #2

jimdt7

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Waitting for someone to buy it and review it !

Jim

 

• Nov 19, 2011

• #3

aryntha

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Or they may just be measuring the slow axis.

 

• Nov 19, 2011

• #4

Trevor

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aryntha said:

Or they may just be measuring the slow axis.

Click to expand...

Chinese laser sellers misleading people? Say it ain't so!

Trevor

 

• Nov 19, 2011

• #5

Cyparagon

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Pretty much all the corrective optics I know of need to go after the collimating lens. From the picture, there doesn't look to be any room after the lens.

The exception would be a FAC lens installed on the die facet, but I seriously doubt they went to the trouble of de-canning and mounting something that requires a great deal of precision.

 

• Nov 19, 2011

• #6

StardustSprinkles

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If these have improved divergence I'll be getting one, but i fear Trevor is correct, just a Chinese typo that happens to make what they're selling look better than the competitors...

 

• Nov 19, 2011

• #7

JaiNobeZ

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Reminds me of this:

That host definitely doesn't have corrective optics.

 

• Nov 19, 2011

• #8

Meatball

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Cyparagon said:

Pretty much all the corrective optics I know of need to go after the collimating lens. From the picture, there doesn't look to be any room after the lens.

The exception would be a FAC lens installed on the die facet, but I seriously doubt they went to the trouble of de-canning and mounting something that requires a great deal of precision.

Click to expand...

I've seen cylindrical optics used mostly after initial collimation, but I've also seen anamorphic prisms used both before that point or after.

Sellers will often list divergence on the slow axis since it's a better number to show. They do the same thing with 445nm diode listings.

 

• Nov 20, 2011

• #9

AAlasers

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I asked Rayfoss about their 635nm lasers, and apparently the divergence listed was a mistake. They did not specify whether they used corrective optics or not, but it was insinuated that they are not in the lasers. All the listed divergence values seem to have changed to 1.8 milli-radians. Closer to a realistic figure, but not quite accurate (maybe they are simply averaging the slow and fast axis).

That being said, they are not unreasonably priced considering the price of these laser diodes - but they are not priced mindful of their competitor (O-like has a similar power 635nm laser for less).

Thanks,

AAlasers

 

Last edited: Nov 20, 2011