Filters: long-wave pass0 pages

Long Wave Pass Filter for 8-12um
Information Sheet
Application
Long wavepass filters are designed to achieve efficient separation of adjacent spectral bands. The cut-on edge
of the filter may be located between 0.85 and 11 microns.

Substrate
Germanium

Transmission
Typically >90% at wavelengths longer than the cut-on edge.
Extent of transmission region is typically in the ratio of 2:1

Attenuation
Typically <0.1% at wavelengths shorter than the cut-on edge.

Edge Slopes
Typically between 3% and 5%

Environmental
Adhesion
Abrasion
Humidity

MIL-C-48497A, 08/09/1980, para 4.5.3.1
MIL-C-48497A, 08/09/1980, para 4.5.3.3
MIL-C-48497A, 08/09/1980, para 4.5.3.2

Tape test
Moderate, 50 strokes with a cheesecloth
o
24hrs, 48 , 95% relative humidity

Typical Transmission Profile

Transmission (%)

100
80
60
40
20
0
7

8

9

10

11

12

13

14

Wavelength (um)
Umicore Coating Services
Kinnoull Street
Dundee, DD2 3ED

Tel: +44 1382 833022
Fax: +44 1382 833824
E-mail: coatingservices@umicore.com
UCS reserves the right to amend or withdraw specifications without prior notice

Vat No: 503 0068 05
Registration No: 118425
Issue No. 01-11