Which chalcogenide glass is equivalent to GASIR or IG2?

Use the cross-reference table on this page. For example Ge33As12Se55 maps to NHG IRG201, Schott IRG22, Umicore GASIR-1, Vitron IG2 and Amorphous AMTIR-1.

Are chalcogenide lenses cheaper than ZnSe for thermal cameras?

For compact, athermal MWIR/LWIR camera modules, molded or polished chalcogenide aspheres often reduce element count versus ZnSe. Send the EFL, F/# and band and we will recommend.

What AR coating is standard on chalcogenide glass?

AR + AR 8–12 µm, AR + AR 8–14 µm and HD + AR 8–12 µm. Witness-coupon curves ship with the lot.

Chalcogenide Glass

ChG

Moldable, low-dn/dT chalcogenide glasses (IRG / GASIR / IG equivalents) for compact thermal lens assemblies and IR sensing.

Quote this material Catalog PDF

Used in

Thermal imaging lens assemblies, industrial radiation measurement, fiber coupling and infrared sensing from 1 to 14 µm.

IRG206 example: PV 0.4 µm, RMS 0.1 µm at Ø100 mm
Cross-referenced to Schott, Umicore, Vitron, Amorphous
Aspheres for athermal MWIR/LWIR camera modules

Capability

Diameter	φ3 – 260 mm
Scratch / Dig	40 / 20	700 Lux
PV	λ/6 @ 632.8 nm	Zygo
Irregularity	0.3 λ @ 632.8 nm	Zygo
RMS	λ/30 @ 632.8 nm	Zygo
Parallelism / decentration	15″ / 50″

Forms & coatings

Forms

Windows (round / rectangular)
Lenses (plano-convex, biconvex, meniscus)
Prisms, wedges, aspheres
Special-shaped components

Coatings

AR + AR 8–12 µm
AR + AR 8–14 µm
HD + AR 8–12 µm

Curves are measured on 1–2 mm plane-parallel witness coupons.

Glass equivalents

We process NHG, CDGM, CNBM and imported melts. Use this table to match a Schott, Umicore, Vitron or Amorphous specification.

Composition	NHG	NS	CDGM	CNBM	Schott	Umicore	Vitron	Amorphous
Ge33As12Se55	IRG201	NBU-IR6	HWS3	HW12	IRG22	GASIR-1	IG2	AMTIR-1
Ge22As20Se58	IRG202	NBU-IR8	HWS4	HW13	—	GASIR-2	—	—
Ge20Sb15Se65	IRG203	NBU-IR1	HWS2	—	—	—	—	—
Ge28Sb12Se60	IRG205	NBU-IR2	HWS1	HW15	IRG25	GASIR-5	IG5	AMTIR-3
As40Se60	IRG206	NBU-IR5	HWS6	HW16	IRG26	—	IG6	AMTIR-2
Ge10As40Se50	IRG207	NBU-IR7	HWS5	HW14	IRG24	—	IG4	—

Questions buyers ask

Which chalcogenide glass is equivalent to GASIR or IG2?: Use the cross-reference table on this page. For example Ge33As12Se55 maps to NHG IRG201, Schott IRG22, Umicore GASIR-1, Vitron IG2 and Amorphous AMTIR-1.
Are chalcogenide lenses cheaper than ZnSe for thermal cameras?: For compact, athermal MWIR/LWIR camera modules, molded or polished chalcogenide aspheres often reduce element count versus ZnSe. Send the EFL, F/# and band and we will recommend.
What AR coating is standard on chalcogenide glass?: AR + AR 8–12 µm, AR + AR 8–14 µm and HD + AR 8–12 µm. Witness-coupon curves ship with the lot.

Transmission windows

One factory, 0.4 to 21 µm

Pick a material by infrared band. Typical design windows overlay a log-scale spectrum from NIR through LWIR.

NIRSWIRMWIRLWIRFIR

0.4 µm2.558–1221 µm

ZnSe
0.6 – 21 µm
ZnS
0.4 – 12 µm
Si
1.2 – 7 µm
ChG
1 – 14 µm

Other substrates

ZnSe ZnS Si