Holmium lasers produce a wavelength of 2100 nm. There are two main types of Holmium laser safety glasses.  One type uses a glass lens such as the LG-080 and LG-080N.  This provides the highest level of visibility and clarity.  

http://www.lasersafetyglasses.com.au/lg-080-holmiu...

http://www.lasersafetyglasses.com.au/lg-080n-holmi...

Specifications of the LG-080 and LG-080N are shown below:

Wavelength & Optical Densities

1010-1500nm OD 7+

850-5200nm OD 3+

945-2300nm OD 5+

2300-2500nm OD 4+

2800-10600nm OD 5+

L-Ratings

850-900 DIR LB3

>900-950 + >1400-2200 DIR LB4

>950-1000 DIR LB5

>1000-1063 DIR LB6

>1063-1400 D LB6 + IRM LB7Y

2900-3200 + 10600 DI LB4

VLT: 75%

The other type uses a polycarbonate lens which has lower visibility however lighter in weight. The LG-090N and LG-090 shown in the links below use a polycarbonate lens.

http://www.lasersafetyglasses.com.au/lg-090-2100-n...

http://www.lasersafetyglasses.com.au/lg-090n-2100-...

The LG-090 and LG-090N specifications  are shown below:

Wavelengths & Optical Density (Marked on Glasses)

2100nm OD 5+ (Holmium Laser) - (OD at 2100nm 5.6)

10,600nm OD 6+ (CO2 Laser)

L-Ratings (Marked on Glasses)

2100 DI LB4

10,600 DI LB4

Laser Wavelengths: 2100 nm

If you have any questions feel free to contact us on 1300 411 337 or email us at info@dioptika.com and one of our laser safety experts will be happy to help.