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IR Optical Filters for NIR, SWIR, MWIR & LWIR

Review infrared filters for NIR, SWIR, MWIR, and LWIR systems. Compare mid infrared bandpass filters, far infrared filters, silicon infrared filters, sapphire IR filters, germanium AR coated windows, and metallized IR windows for sensing and imaging instruments.

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How to Choose

Choose by infrared region first, then confirm detector sensitivity, substrate transmission, coating band, environmental exposure, and mounting requirements. IR filters often need material choices that differ from visible filters.

IR Filters

OPTOStokes IR filters cover near-infrared (750-1100nm), SWIR 1.1-2.5µm, MWIR 3-5µm, and LWIR 8-14µm applications. The catalog also includes mid/far IR narrow bandpass filters, wide bandpass filters, infrared longpass filters, AR coatings, and metallized IR windows for thermal imaging, gas sensing, spectroscopy, and detector packaging.

View full IR Bandpass Filters

IR Bandpass Filters

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Model	CWL (nm)	Transmittance	FWHM (nm)	Optical Density
STO-BP680	680±2	T≥90%	10-20	OD≥3@300-1100
STO-BP1120	1120±2	T≥90%	10-20	OD≥3@300-1200
STO-BP1150	1150±2	T≥90%	10-20	OD≥3@300-1200
STO-BP1173	1173±2	T≥90%	10-20	OD≥3@300-1200
STO-BP1250	1250±2	T≥70%	10-20	OD≥3@700-1800
STO-BP1285	1285±2	T≥70%	10-20	OD≥3@1000-1700
STO-BP1455	1455±2	T≥50%	10-20	OD≥3@1200-1800
STO-BP1535	1535±2	T≥90%	10-20	OD≥3@600-2000
STO-BP1545	1545±2	T≥90%	10-20	OD≥3@600-2000
STO-BP1550	1550±2	T≥90%	10-20	OD≥3@600-2000
STO-BP1555	1555±2	T≥90%	10-20	OD≥3@600-2000
STO-BP1570	1570±2	T≥90%	10-20	OD≥3@1250-1700
STO-BP1615	1615±2	T≥90%	10-20	OD≥3@1450-1900
STO-BP1620	1620±2	T≥70%	10-20	OD≥3@1450-1900
STO-BP1625	1625±2	T≥70%	10-20	OD≥3@1450-1900
STO-BP1655	1655±5	T≥70%	10-20	OD≥3@1350-2200
STO-BP1660	1660±5	T≥70%	10-20	OD≥3@1350-2200
STO-BP1680	1680±10	T≥90%	10-20	OD≥3@800-3000
STO-BP1685	1685±2	T≥80%	10-20	OD≥3@1550-2000
STO-BP1695	1695±2	T≥80%	10-20	OD≥3@1550-2000
STO-BP1935	1935±2	T≥60%	10-20	OD≥3@800-2000
STO-BP1940	1940±2	T≥60%	10-20	OD≥3@800-2000
STO-BP2050	2050±2	T≥80%	10-20	OD≥3@800-2000
STO-BP2180	2180±2	T≥80%	10-20	OD≥3@800-2000
STO-BP2230	2230±2	T≥80%	10-20	OD≥3@800-2000
STO-BP2270	2270±2	T≥80%	10-20	OD≥3@800-2000
STO-BP2340	2340±2	T≥80%	10-20	OD≥3@800-2000
STO-BP1100	1100±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1120	1120±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1125	1125±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1150	1150±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1173	1173±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1200	1200±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1235	1235±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1245	1245±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1250	1250±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1290	1290±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1300	1300±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1320	1320±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1340	1340±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1380	1380±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1430	1430±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1445	1445±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1450	1450±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1530	1530±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1535	1535±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1540	1540±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1550	1550±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1570	1570±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1575	1575±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1600	1600±5	T≥90%	90-100	OD≥3@350-1700
STO-BP1610	1610±5	T≥90%	90-100	OD≥3@350-1700
STO-BP1630	1630±5	T≥90%	90-100	OD≥3@350-1700
STO-BP1650	1650±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1654	1654±5	T≥90%	20-60	OD≥3@350-1700
STO-BP1660	1660±5	T≥90%	20-60	OD≥3@800-3000
STO-BP1680	1680±5	T≥90%	20-60	OD≥3@800-3000
STO-BP1700	1700±5	T≥90%	90-100	OD≥3@800-2000
STO-BP1714	1714±5	T≥90%	90-100	OD≥3@800-2000
STO-BP1716	1716±5	T≥90%	90-100	OD≥3@800-2000
STO-BP1780	1780±5	T≥90%	40-70	OD≥3@200-3000
STO-BP1800	1800±5	T≥90%	40-70	OD≥3@200-3000
STO-BP1810	1810±5	T≥90%	40-70	OD≥3@200-3000
STO-BP1818	1818±5	T≥90%	40-70	OD≥3@200-3000
STO-BP1830	1830±5	T≥90%	40-70	OD≥3@200-3000
STO-BP1920	1920±5	T≥90%	40-70	OD≥3@200-3000
STO-BP1930	1930±5	T≥90%	40-70	OD≥3@200-3000
STO-BP1935	1935±5	T≥90%	40-70	OD≥3@200-3000
STO-BP1940	1940±5	T≥90%	40-70	OD≥3@200-3000
STO-BP1945	1945±5	T≥90%	40-70	OD≥3@200-3000
STO-BP1950	1950±5	T≥90%	40-70	OD≥3@200-3000

IR Longpass Filters

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Model	Cut-On (nm)	Transmittance	Transmission Range (nm)	Optical Density
STO-LP900	900±5	T≥90%	910-1100	OD≥3@350-880
STO-LP910	910±5	T≥90%	920-1100	OD≥3@350-890
STO-LP920	920±5	T≥90%	930-1100	OD≥3@350-900
STO-LP920	920±10	T≥90%	940-1700	OD≥3@350-890
STO-LP930	930±5	T≥90%	940-1100	OD≥3@350-910
STO-LP940	940±5	T≥90%	950-1100	OD≥3@350-920
STO-LP950	950±5	T≥90%	970-1100	OD≥3@350-930
STO-LP970	970±5	T≥90%	980-1100	OD≥3@350-940
STO-LP1000	1000±10	T≥90%	1020-2000	OD≥3@350-970
STO-LP1010	1010±10	T≥90%	1030-1200	OD≥3@350-990
STO-LP1060	1060±10	T≥88%	1085-1100	OD≥3@350-1035
STO-LP1150	1150±10	T≥90%	1180-1700	OD≥3@700-1120
STO-LP1170	1170±10	T≥90%	1200-1700	OD≥3@700-1135
STO-LP1200	1200±10	T≥90%	1230-1800	OD≥3@350-1175
STO-LP1250	1250±10	T≥90%	1260-1750	OD≥3@350-1215
STO-LP1270	1270±10	T≥90%	1300-1800	OD≥3@350-1240
STO-LP1380	1380±10	T≥90%	1400-2150	OD≥3@700-1360
STO-LP1400	1400±10	T≥90%	1420-1100	OD≥3@350-1380
STO-LP1450	1450±10	T≥90%	1480-1800	OD≥3@350-1420
STO-LP1470	1470±10	T≥90%	1500-1800	OD≥3@350-1400
STO-LP1600	1600±10	T≥90%	1625-2300	OD≥3@350-1540

Catalog Mid/Far IR Narrow Bandpass Filters

Mid and far infrared narrow bandpass filters use silicon, sapphire, germanium, calcium fluoride, and zinc selenide substrates for MWIR and LWIR instrument bands. Custom sizes are available for detector modules and thermal sensing systems.

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Model	IR Region	CWL (nm)	FWHM (nm)	Peak Transmittance	Blocking	Substrate	Size
STO-NBP 2750 500nm	MWIR	2750±50nm	500±60nm	>=80%	400-7000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 2775 250nm	MWIR	2775±30nm	250±20nm	>=80%	400-7000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 2850 400nm	MWIR	2850±40nm	400±30nm	>=80%	400-7000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3040 140nm	MWIR	3040±30nm	140±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3040 140nm	MWIR	3040±30nm	140±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 3060 140nm	MWIR	3060±30nm	140±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3060 140nm	MWIR	3060±30nm	140±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 3080 140nm	MWIR	3080±30nm	140±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 3090 140nm	MWIR	3090±30nm	140±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3280 160nm	MWIR	3280±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3300 160nm	MWIR	3300±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3300 160nm	MWIR	3300±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 3310 60nm	MWIR	3310±10nm	60±20nm	>=80%	400-4700nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3330 60nm	MWIR	3330±10nm	60±20nm	>=80%	400-4700nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3330 160nm	MWIR	3330±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3375 160nm	MWIR	3375±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3375 160nm	MWIR	3375±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 3400 120nm	MWIR	3400±30nm	120±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3400 180nm	MWIR	3400±30nm	180±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3420 180nm	MWIR	3420±30nm	180±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3440 120nm	MWIR	3440±30nm	120±20nm	>=80%	400-25000nm,T<=1%	Sapphire	Dia. 25 x 0.8mm
STO-NBP 3440 160nm	MWIR	3440±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3460 150nm	MWIR	3460±30nm	150±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3800 300nm	MWIR	3800±40nm	300±30nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3900 90nm	MWIR	3900±20nm	90±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3920 90nm	MWIR	3920±20nm	90±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3950 90nm	MWIR	3950±20nm	90±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 3950 90nm	MWIR	3950±20nm	90±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	3.3 x 3.3 x 0.5mm
STO-NBP 3970 90nm	MWIR	3970±20nm	90±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4000 90nm	MWIR	4000±20nm	90±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4050 180nm	MWIR	4050±30nm	180±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4100 180nm	MWIR	4100±30nm	180±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4200 180nm	MWIR	4200±30nm	180±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4230 160nm	MWIR	4230±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4260 180nm	MWIR	4260±30nm	180±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4260 180nm	MWIR	4260±30nm	180±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	2.9 x 2.9 x 0.5mm
STO-NBP 4260 180nm	MWIR	4260±30nm	180±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	3.3 x 3.3 x 0.5mm
STO-NBP 4280 180nm	MWIR	4280±20nm	180±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4300 130nm	MWIR	4300±30nm	130±20nm	>=75%	400-16000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 4300 160nm	MWIR	4300±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4300 180nm	MWIR	4300±30nm	180±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4320 160nm	MWIR	4320±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4330 130nm	MWIR	4330±30nm	130±20nm	>=80%	400-16000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 4330 180nm	MWIR	4330±30nm	180±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4360 180nm	MWIR	4360±30nm	180±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4380 180nm	MWIR	4380±30nm	180±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4420 60nm	MWIR	4420±10nm	60±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 4430 60nm	MWIR	4430±10nm	60±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 4450 60nm	MWIR	4450±10nm	60±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 4450 200nm	MWIR	4450±30nm	200±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 4480 60nm	MWIR	4480±10nm	60±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 4500 60nm	MWIR	4500±10nm	60±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 4500 140nm	MWIR	4500±30nm	140±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 4500 200nm	MWIR	4500±30nm	200±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4520 140nm	MWIR	4520±30nm	140±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.6mm
STO-NBP 4560 160nm	MWIR	4560±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4600 160nm	MWIR	4600±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4640 160nm	MWIR	4640±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4650 160nm	MWIR	4650±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4680 150nm	MWIR	4680±30nm	150±20nm	>=80%	400-25000nm,T<=1%	Sapphire	Dia. 25 x 0.8mm
STO-NBP 4690 160nm	MWIR	4690±30nm	160±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4750 180nm	MWIR	4750±30nm	180±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 4770 150nm	MWIR	4770±30nm	150±20nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 5300 600nm	MWIR/LWIR transition	5300±40nm	600±30nm	>=80%	400-11000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.5mm
STO-NBP 7300 300nm	MWIR/LWIR transition	7300±40nm	300±30nm	>=70%	400-12000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.5mm
STO-NBP 7350 200nm	MWIR/LWIR transition	7350±30nm	200±30nm	>=65%	400-12000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 7410 200nm	MWIR/LWIR transition	7410±30nm	200±30nm	>=65%	400-12000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 7470 200nm	MWIR/LWIR transition	7470±30nm	200±30nm	>=75%	400-12000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 7625 200nm	MWIR/LWIR transition	7625±30nm	200±30nm	>=75%	400-12000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 7650 200nm	MWIR/LWIR transition	7650±30nm	200±30nm	>=60%	400-12000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 8420 200nm	LWIR	8420±40nm	200±30nm	>=60%	400-16000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 9020 180nm	LWIR	9020±30nm	180±30nm	>=75%	400-16000nm,T<=1%	Float-zone silicon	Dia. 100 x 0.5mm
STO-NBP 9080 180nm	LWIR	9080±30nm	180±30nm	>=75%	400-16000nm,T<=1%	Float-zone silicon	Dia. 100 x 0.5mm
STO-NBP 9900 370nm	LWIR	9900±30nm	370±20nm	>=70%	400-16000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 10000 370nm	LWIR	10000±40nm	370±30nm	>=75%	400-16000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 10050 370nm	LWIR	10050±40nm	370±30nm	>=60%	400-16000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 10270 600nm	LWIR	10270±40nm	600±30nm	>=75%	400-13500nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 10460 370nm	LWIR	10460±40nm	370±30nm	>=75%	400-14000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 10500 600nm	LWIR	10500±50nm	600±40nm	>=75%	400-13500nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 10560 370nm	LWIR	10560±40nm	370±30nm	>=75%	400-18000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 10700 370nm	LWIR	10700±40nm	370±30nm	>=75%	400-14000nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 11500 600nm	LWIR	11500±50nm	600±40nm	>=65%	400-14500nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 11700 600nm	LWIR	11700±50nm	600±40nm	>=65%	400-14500nm,T<=1%	Monocrystalline silicon	Dia. 100 x 0.5mm
STO-NBP 14500 1000nm	LWIR	14500±50nm	1000±50nm	>=70%	400-19000nm,T<=1%	Monocrystalline silicon	Dia. 25 x 0.5mm

Catalog IR Wide Bandpass Filters

Wide infrared bandpass filters provide broader MWIR and LWIR transmission windows with out-of-band blocking for thermal imaging, gas analysis, and infrared sensing.

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Model	IR Region	Transmission Range	Average Transmittance	Blocking	Size	Substrate
STO-WBP 3100-3800nm Filter	MWIR	3100-3800nm	>=85%	400-25000nm, <=1%	Custom	Sapphire
STO-WBP 3250-3500nm Filter	MWIR	3250-3500nm	>=88%	400-6000nm, <=1%	Custom	Germanium
STO-WBP 3550-4150nm Filter	MWIR	3550-4150nm	>=90%	400-6000nm, <=1%	Custom	Germanium
STO-WBP 3670-4970nm Filter	MWIR	3670-4970nm	>=90%	400-6000nm, <=1%	Custom	Germanium
STO-WBP 4500-5000nm Filter	MWIR	4500-5000nm	>=90%	400-6000nm, <=1%	Custom	Germanium
STO-WBP 4750-5400nm Filter	MWIR/LWIR transition	4750-5400nm	>=80%	400-25000nm, <=1%	Custom	Sapphire
STO-WBP 8000-14000nm Filter	LWIR	8000-14000nm	>75%	0.4-7.5um, 15-21.5um, <=1%	Custom	Monocrystalline silicon
STO-WBP 8000-9450nm Filter	LWIR	8000-9450nm	>=92%	400-12000nm, <=1%	Custom	Germanium

Catalog IR Longpass Filters

Infrared longpass filters transmit longer wavelength regions while blocking shorter wavelength energy for detector-side isolation and thermal imaging paths.

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Model	IR Region	Transmission Range	Average Transmittance	Blocking	Size	Substrate
STOLWP 3000-5000nm Filter	MWIR	3000-5000nm	>85%	400-2900nm, <=1%	Custom	Sapphire
STOLWP 5500-14000nm	LWIR	5500-14000nm	>80%	400-5000nm, <=1%	Custom	Monocrystalline silicon
STOLWP 7000-14000nm Filter	LWIR	7000-14000nm	>80%	400-6500nm, <=1%	Custom	Monocrystalline silicon
STOLWP 7700-9000nm Filter	LWIR	7700-9000nm	>80%	400-7600nm, <=1%	Custom	Monocrystalline silicon
STOLWP 8000-12000nm Filter	LWIR	8000-12000nm	>85%	400-7500nm, <=1%	Custom	Germanium

Catalog IR AR Coatings

Infrared anti-reflection coatings reduce surface reflection and improve system throughput for silicon, sapphire, and germanium optics.

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Coating	IR Region	Transmission Range	Average Transmittance	Size	Substrate
0.8-5µm AR	MWIR	0.8-5um	>=86%	Custom	Sapphire
2.9-14.5µm AR	LWIR	2.9-14.5um	>=73%	Custom	Germanium
3-5µm AR	MWIR	3-5um	>=90%	Custom	Monocrystalline silicon
7-12µm AR	LWIR	7-12um	>=88%	Custom	Monocrystalline silicon
8-12µm AR+DLC	LWIR	8-12um	>=75%	Custom	Monocrystalline silicon
8-14µm AR	LWIR	8-14um	>=83%	Custom	Monocrystalline silicon

Catalog Metallized IR Windows

Metallized infrared windows use a coated optical aperture with metallized edges for soldering or hermetic packaging in detector and imaging assemblies.

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Specification	IR Region	Clear Aperture	Metallized Area	Spectral Specification	Substrate	Outer Size
16 x 16 x 0.8mm	MWIR	13.2 x 13.2	≥13.7 x 13.7	3-5um, Tavg>=96%	Germanium	16 x 16
Dia. 12 x 1mm	MWIR	Dia. 10	≥Dia. 10.5	3-5um, Tavg>=96%	Monocrystalline silicon	Dia. 12
Dia. 18 x 1mm	MWIR	Dia. 14	≥Dia. 14.5	3-5um, Tavg>=96%	Monocrystalline silicon	Dia. 18
Dia. 30 x 1mm	MWIR	Dia. 26	≥Dia. 26.5	3-5um, Tavg>=96%	Sapphire	Dia. 30
10 x 10 x 1mm	LWIR	8.5 x 8.5 x 0.9	≥8.9 x 8.9	8-12um, Tavg>=82%	Monocrystalline silicon	10 x 10 x 1
Dia. 2.5 x 0.28mm	SWIR	Dia. 1.6	≥Dia. 1.8	1250-1650nm, Tavg>99%	Sapphire	Dia. 2.5

Related Categories

Related Engineering Notes

NIR, SWIR, MWIR, and LWIR are different design spaces

IR filters should be matched to detector material, substrate transmission, and working temperature. Do not treat all IR bands as interchangeable.

Substrate and coating constraints

Material choice can limit usable wavelength range before coating performance is considered. Confirm substrate first for IR applications.

Thermal imaging and sensing

For thermal or gas-sensing work, specify the target absorption band, blocking range, and operating environment.

FAQ

Which IR regions are covered?

The page covers near infrared, short-wave infrared, mid-wave infrared, and long-wave infrared filter needs where data is available.

Why does substrate matter for IR filters?

Substrate materials have different transmission ranges, so the material must support the target infrared wavelength band.

Can IR filters be customized?

Yes. Custom wavelength bands, sizes, substrate choices, and coating targets can be discussed for infrared systems.

Quality & Compliance

Documentation-ready optical filter supply

For OEM programs, laboratory instruments, and industrial systems, OPTOStokes keeps quality, material compliance, and engineering support visible from the start of supplier evaluation.

Quality system ISO 9001 managed production

Process control, inspection records, and repeatable coating workflows for production optical components.

Material compliance RoHS / REACH support

Compliance documentation can be prepared for qualified projects and regulated supply chains.

Factory-direct Custom coating and dimensions

Wavelength, FWHM, substrate, AOI, size, and mounting requirements can be reviewed with engineering.

Procurement ready Quote and data review

Share target wavelength, blocking level, transmittance, and drawing requirements for a focused quote.

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