Ground Glass Alignment Disks

Great for Viewing Beams Exiting a Lens Tube
Ø1/2", Ø1", and Ø2" Versions Available
Drilled Centering Hole

DG20-1500-H2-MD

DG10-1500-H1-MD

DG10-1500-H1

DG05-1500-H1-MD

Application Idea

A DG10-1500-H1 Unmounted Ø1" Frosted Glass Alignment Disk Is Used to Align a CPS520 Compact Laser Module

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Overview
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Diffuser Selection Guide
Ground Glass Diffusers
Standard Diffusers	N-BK7 Substrate	Unmounted, Uncoated	350 nm to 2.0 µm
		Unmounted, AR Coated	350 nm - 700 nm 650 nm - 1050 nm
		Mounted, Uncoated	350 nm - 2.0 µm
	UVFS Substrate	Unmounted, Uncoated	185 nm - 2.0 µm
Diffuse Reflectors	N-BK7 Substrate	Unmounted, UV-Enhanced Aluminum Coated	250 nm - 450 nm
		Unmounted, Protected Silver Coated	450 nm - 20 µm
		Unmounted, Protected Gold Coated	800 nm - 20 µm
Alignment Disks
Engineered Diffusers
Diffuser Kits

Features

Made from 1500 Grit N-BK7 Ground Glass Substrate
Center Hole Aides Alignment Process

Our frosted glass alignment disks are made from 1500 grit Ground Glass Diffusers. Versions are available either unmounted or in an SM-threaded engraved cell. These disks are ideal for use when viewing a beam exiting a lens tube as the beam can be seen through the ground glass. An example of this is shown in the image at the top right of this page. We also offer other alignment tools as well as fluorescent viewing cards.

Posted Comments:

Martina Gebbe (posted 2020-11-10 06:21:46.53)

I could not find any information about a damage threshold of these alignment disks. I would like to align a 780nm beam with a power of up to 3W which is probably too much for these disks.

YLohia (posted 2020-11-11 10:09:41.0)

Hello, thank you for contacting Thorlabs. The damage threshold of uncoated optics is strongly influenced by the surface finish, which is especially relevant to diffusers, as well as subsurface damage. Laser damage is a concern with optics because it prevents them from performing their function, which for this part is simply visual alignment and that should not be significantly impacted by laser damage. While we have not performed damage threshold testing on these disks so we cannot guarantee a particular outcome, we would not expect your 780 nm 3 W beam to cause damage.

toewj (posted 2016-04-08 00:29:18.483)

Will this alignment guide work for 266 nm lasers?

besembeson (posted 2016-04-11 11:28:11.0)

Response from Bweh at Thorlabs USA: No it will not. The DG10-1500-H1-MD is made with N-BK7 substrate and designed for visible spectrum, and not deep UV which will not be visible on the glass.

rsink (posted 2014-09-24 09:35:28.547)

The drawing for this part says it is ground on BOTH sides. Is this correct? How can you project visible image on it if both sides are ground? Thanks, Rick Sink

jlow (posted 2014-09-25 09:25:53.0)

Response from Jeremy at Thorlabs: The part is grounded on both sides. I will contact you directly to discuss about using this in your application.

bdada (posted 2011-10-21 12:25:00.0)

Response from Buki at Thorlabs: Thank you for your feedback. The DG20-1500-H2 is currently showing on our website. Please contact TechSupport@thorlabs.com if you have further questions about this product.

user (posted 2011-10-20 16:00:12.0)

DG20-1500-H2 Frosted Glass Alignment Disk, Ø2", Ø2 mm Hole .... item disappeared?

Frosted Glass Alignment Disks

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1500 Grit Ground Glass on Both Sides
Drilled Centering Hole
Great for Viewing Beams Exiting a Lens Tube

This frosted glass alignment disk is made from a 1500 grit Ground Glass Diffuser. The DG10-1500-H1 is Ø1" (Ø25.4 mm), and features a Ø1 mm (Ø0.04") hole drilled in the center for alignment purposes. The disk is ideal for use when viewing a beam exiting a lens tube as the beam can be seen through the ground glass. An example of this is shown in the image at the top right of this page. The disk is also available mounted in SM threaded cells in the section below.

Threaded Frosted Alignment Disks

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SM05, SM1, or SM2 Threaded Versions
1500 Grit Ground Glass on Both Sides with Drilled Centering Hole
Great for Viewing Beams Exiting a Lens Tube
Mounting Cells Include Engraved Part Number, Grit, and Center Hole Diameter

Our frosted glass alignment disks are also available mounted in SM threaded cells. The 1500 grit N-BK7 diffusers are excellent alignment targets for visible beams. An incident beam can be easily seen on either side of the disk and aligned to the Ø1 mm centering hole on the Ø1/2" and Ø1" versions or the Ø2 mm hole on the Ø2" version. The SM threaded mounts allow the alignment disks to be quickly inserted or removed from an optical system without the need of retaining rings and spanner wrenches to secure the disk within a system. Please see the section immediately above for unmounted frosted alignment disks.