Would you recommend this lens?

[Voldy356]

Is this a good lens to buy for the mitsubishi 638nm 500mw laser diode?

638nm Laser Diode Collimating Coated Focus Lens/MP9x0.5x10.5 Half-Threaded Frame | eBay

Find many great new & used options and get the best deals for 638nm Laser Diode Collimating Coated Focus Lens/MP9x0.5x10.5 Half-Threaded Frame at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[Alaskan]

If you don't mind spending a few dollars more I recommend a G8 lens with a EFL of 8 mm instead which you can buy from DTR LPF: https://sites.google.com/site/dtrslasershop/home/glass-lenses

This diode?

https://www.laserdiodesource.com/files/pdfs/laserdiodesource_com/6975/638nm_Capless_LAser_DIode_CivilLaser-1520207780.pdf

If the lens you posted about has a focal length of 10.5 mm (specified as that) when used with the above diode, and the diode you get has a 35 degree fast axis output, some of the beam will not make it through the diameter of the lens. If the diode you receive happens to have the maximum 45 degree wide fast axis output (specs indicate it can), over 30 percent of the beam diameter won't make it through the lens and will be blocked from getting out.

 

[Lifetime17]

Hi Yes DTR is the place to go for collimating lenses as Alaskan said. The G8 is a great choice, The Mitsu 500 diode isa work horse of the 638nm diodes. That diode can be pushed to 1W+ With good heat sinking , its my favorite 638 diode .
Rich

 

[Voldy356]

If you don't mind spending a few dollars more I recommend a G8 lens with a EFL of 8 mm instead which you can buy from DTR LPF: https://sites.google.com/site/dtrslasershop/home/glass-lenses

This diode?

https://www.laserdiodesource.com/files/pdfs/laserdiodesource_com/6975/638nm_Capless_LAser_DIode_CivilLaser-1520207780.pdf

If the lens you posted about has a focal length of 10.5 mm (specified as that) when used with the above diode, and the diode you get has a 35 degree fast axis output, some of the beam will not make it through the diameter of the lens. If the diode you receive happens to have the maximum 45 degree wide fast axis output (specs indicate it can), over 30 percent of the beam diameter won't make it through the lens and will be blocked from getting out.

I am using the Mitsubishi ML501P73-02 diode, and I want the best beam specs.

 

[Lifetime17]

HI,
To make a long story short just oder the G8 lens from DTR, and if you dont mind power loss go with a 3 Element lens .
DTR has the best and correct lenses .. Do it ...
Rich

 

[Alaskan]

Here is a PDF document showing the specs, Yep I believe the G8 is the best you can do using a 6.3 mm diameter collimation lens without correction.

http://www.mitsubishielectric.com/semiconductors/content/product/optical/laser/ml501p73_p1245.pdf

 

[Lifetime17]

Hi,
This tread makes me want to build another Mitsu 500 using a G8 lens .
Rich

 

[Alaskan]

I have a 900+ mw pointer which uses that laser diode, but for my likes it really needs a 10x beam expander to reduce the divergence. High power red laser diodes are always high divergence devices when using a ~6 mm or smaller collimation lens, at long distances the spot becomes a wide rectangle, terrible! Put a 10 x beam expander on them and they are then fine, although a fat beam when doing that, I don't mind the fat beam at all.

Although the G8 lens is still ~6 mm diameter, the longer focal length reduces the divergence further than if using a G2, or even a 3 element lens like he asked about.

 

[Voldy356]

HI,
To make a long story short just oder the G8 lens from DTR, and if you dont mind power loss go with a 3 Element lens .
DTR has the best and correct lenses .. Do it ...
Rich

I don't mind a power loss at all, thanks.

 

[Alaskan]

With the 3 element lens you found, the divergence will be lower due to the longer focal length, but so will the output power. To each their own Only thing is, that lens is twice the price some sellers are offering the same thing for.

Techhood also owns newgazer on ebay and the price for something similar is $4.50, more than half less, but why buy a half-threaded? I prefer a fully threaded lens module.

Half thread:

3 Elements Glass Collimating Lens Coated for Red Laser Diode Half-Thread | eBay

Thread type: half thread. Lens Material: Glass. Lens Size: 6mm. Coated: Yes. 1 pcs lens. Be sure the operator has experience in optics DIY or testing.

www.ebay.com

Full thread:

635nm-680nm Coated 3 elements Glass Collimating Lens/M9P0.5*10 Metal Frame | eBay

Find many great new & used options and get the best deals for 635nm-680nm Coated 3 elements Glass Collimating Lens/M9P0.5*10 Metal Frame at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[BowtieGuy]

Good advice from Chris and Rich, and I agree with Chris, why buy a half threaded lens and reduce your adjustment range when a fully threaded version is available.

 

[Alaskan]

Look at how many threads this one has, and the FL is just as good long the one you found:

RED Glass Collimating Lens/M9P0.5*10 Metal Frame for 635nm-680nm Laser Diode | eBay

Find many great new & used options and get the best deals for RED Glass Collimating Lens/M9P0.5*10 Metal Frame for 635nm-680nm Laser Diode at the best online prices at eBay! Free shipping for many products!

www.ebay.com

I think his product for the half-thread is probably moving too slow, thus the post, but why not just lower its price, it is priced twice as high as it should be, unless there is something about it to warrant double? Half-shells cost more?