Looking for aperture window

[Gryphon]

While messing around with my WL Spyders I noticed my older Arcitc has a different "100%" lens than my newer one. Compared side by side you'll notice the left one reflects the true white color of my ceiling light while the right one has a bluish AR coating hue to it.

Doing some power tests I found the laser produces 753mW without any cap installed but that gets chopped to 680mW (nearly 10% loss) with the non AR coated cap while losses with the AR coated cap are almost negligible.

Ive tried my best to look for AR coated lens on ebay and thor labs but I must not know exactly what im looking for or not using the correct search terms. Does anyone have a good idea of what this piece of glass would be called or a good place to get one? Its 1mm thick, 20mm in diameter and perfectly flat (no magnification)

Thanks!

 

[RedCowboy]

Try " 20mm AR coated laser window " LOL you knew what it was when you put " window " in the title of this thread.

Optical Windows - Thorlabs

Thorlabs designs and manufactures components, instruments, and systems for the photonics industry. We provide a portfolio of over 22,000 stocked items, complimented by endless custom solutions enabled by vertical integration. Thorlabs is comprised of 22 wholly owned design and manufacturing...

www.thorlabs.com

20mm Dia., 2mm Thick, VIS-NIR AR Coated Sapphire Window

TECHSPEC Sapphire Windows are used in demanding systems due to surface hardness, thermal conductivity and chemical resistance. ✓ Shop now with Edmund Optics!

www.edmundoptics.com

https://www.aliexpress.us/item/2251832701131805.html?gatewayAdapt=glo2usa4itemAdapt

Overruns and Clearance Windows | Esco Optics

Browse our extensive inventory of overruns and clearance optics at deeply discounted prices. Up to 60% off windows.

escooptics.com

Laser Protective Windows D20 - D29 Series Quartz Fused Silica for Fiber Laser | eBay

Find many great new & used options and get the best deals for Laser Protective Windows D20 - D29 Series Quartz Fused Silica for Fiber Laser at the best online prices at eBay! Free shipping for many products!

www.ebay.com

Laser Potective Window Quartz Fused Silica Lens for Raytools WSX Laser Head | eBay

Clear aperture：≥90%. The laser cutting. head are very sensitive to any type of contamination. We have the best quality of protective windows to protect the focusing lens against contamination. Upper protective lens.

www.ebay.com

 

[Gryphon]

Try " 20mm AR coated laser window " LOL you knew what it was when you put " window " in the title of this thread.

^This is me right now lol

I think it came down to a case of staring at the problem for so long the obvious solution wasn't apparent. I tried, glass, HR, AR, OC, broadband, narrow band, lens, high pass, low pass, but not once did I think about windows until I came here and needed a title for the thread.

I ordered an ebay window and one from Edmundoptics

Thank you RedCowboy!

 

[RedCowboy]

You can find all kinds of things online if you're creative with the search wording.
Just remember, never give up, never surrender.