SCHOTT Optical Filter Glass

SCHOTT Optical Filter Glass is a non-crystalline, inorganic mixture of chemicals fused by heating with silica, boric or phosphoric oxides. These glasses have characteristics of selective transmittance, capable of passing certain light wavelengths, while being opaque to others. Due to their unique spectral properties, optical filter glasses are used in a wide variety of applications such as Fluorescence spectroscopy, Raman spectroscopy, and lithography, among many others.

Most optical filter glass falls into the following categories:

With knowledge of your transmission and environmental requirements, China Glass Quartz Parts Inc. can assist with selecting the best filter glass to meet your needs. CGQPI can then CNC mill, cut, drill, lap, and polish the glass to many sizes, shapes, and surface finishes.

Longpass Filters

Longpass optical filter glasses allow long wavelengths to pass through and are characterized by the fact that a range of low transmission (blocking range) n the short wavelength range is joined to an area of high transmission (pass band) in the long wavelength range.

Longpass optical filter glasses are structured according to the following group names:

GG – Nearly colorless to yellow glass, IR-transmitting
OG – Orange glass, IR-transmitting
RG – Red and black glass, IR-transmitting
N-WG – Colorless glasses with different cutoffs in the UV, transmitting in the visible and IR ranges

At China Glass Quartz Parts Inc., we offer the following SCHOTT longpass optical filter glasses:

BG3	GG420	OG550	RG695
N-WG280	GG435	OG570	RG715
N-WG295	GG455	OG590	RG9
N-WG305	GG475	RG610	RG780
N-WG320	GG495	RG630	RG830
GG395	OG515	RG645	RG850
GG400	OG530	RG665	RG1000

Bandpass Filters

Bandpass optical filter glasses selectively transmit a desired wavelength range and are characterized by the fact that they connect a region of high transmission (pass band) and shorter and longer wavelength ranges with low transmission (blocking ranges).

Bandpass optical filter glasses are structured according to the following group names:

UG – UV-transmitting glass
BG – Blue, blue-green, and multiband glass
VG – Green glass

At China Glass Quartz Parts Inc., we offer the following SCHOTT bandpass optical filter glasses:

UG1	BG25	BG55	BG64
UG2A	BG38	BG60	BG66HS
UG5	BG39	BG60HT	BG67
UG11	BG40	BG61	BG67HT
BG3	BG42	BG62	VG9
BG7	S8612	BG62HT	VG20
BG18	BG50	BG63

NVIS Bandpass Filters – NVIS Glass with a special color and high optical density for Near IR*

S8022
S8023

Multi Bandpass Filter – light of several bands of wavelengths can pass through this filter

BG36

Shortpass Filters

Shortpass optical filter glasses allow short wavelengths to pass through while long wavelengths are blocked. Typically, the slope at the transition between the pass band and blocking range of a longpass filter is much steeper than the slope of a shortpass filter.

Shortpass optical filter glasses are structured according to the following group name:

KG – Virtually colorless glass with high transmission in the visible and high absorption in the IR ranges (heat protection filters)

At China Glass Quartz Parts Inc., we offer the following SCHOTT shortpass optical filter glasses:

Neutral Density Filters

Neutral Density optical filter glasses exhibit nearly constant spectral transmittance in the range of visible light, for example from 400 nm to 800 nm, and are therefore only slightly wavelength dependent. Neutral density filters are perfectly grey in color.

Neutral Density optical filter glasses are structured according to the following group names:

NG Grey glass with uniform attenuation in the visible range

At China Glass Quartz Parts Inc., we offer the following SCHOTT Neutral Density optical filter glasses:

NG1
NG3
NG4
NG5
NG9
NG11