Jiangsu · China · Source factory
Infrared optics,
engineered at the source.
ZnSe windows, CO₂ laser lenses, aspheres and F-theta scan assemblies — plus ZnS, silicon and chalcogenide glass. Built in Changzhou for lasers, thermal cameras and drawings that cannot slip.
20+
years in IR optics
φ400 mm
largest ZnSe aperture
λ/50
RMS, Zygo verified
ISO
quality systems
Materials
Four IR substrates. Full spectrum.
ZnSe
0.6 – 21 µmZinc Selenide
Our core material. Low-absorption CVD ZnSe for high-energy CO₂ lasers, thermal imaging and broadband infrared systems at 10.6 µm.
ZnS
0.4 – 12 µmZinc Sulfide
Tough, broadband ZnS for windows that must survive the field — IR astronomy, security, automotive night vision and industrial infrared.
Si
1.2 – 7 µmSilicon
Infrared-grade monocrystalline silicon for MWIR imaging, spectrometers and laser optics — lightweight, stiff and cost-effective.
ChG
1 – 14 µmChalcogenide Glass
Moldable, low-dn/dT chalcogenide glasses (IRG / GASIR / IG equivalents) for compact thermal lens assemblies and IR sensing.
CO₂ assemblies
9.3 / 10.6 µmF-θ, 3-axis, beam expanders
Scan lenses from 73 to 592 mm EFL, three-axis marking heads and M22 expanders.
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.
- ZnSe0.6 – 21 µm
- ZnS0.4 – 12 µm
- Si1.2 – 7 µm
- ChG1 – 14 µm
Applications
Where the beam has to land.
High-energy laser systems
CO₂ cutting, welding, marking and medical lasers. ZnSe windows, focusing lenses, F-θ scan lenses and three-axis dynamic assemblies designed around 9.3 / 10.6 µm.
Multispectral & thermal
Broadband ZnS and ZnSe windows and chalcogenide lens sets for 3–5 µm and 8–12 µm cameras, with HD / AR stacks for outdoor use.
High-resolution imaging
Aspheres, diffractive ZnSe elements and tight irregularity (λ/50 RMS) for UAV payloads, scientific imagers and inspection optics.
New energy vehicles
Cabin and ADAS night-vision windows in ZnS and chalcogenide glass, with durable HD coatings for weather, wash and stone impact.
Factory
Changzhou. Cleanroom to coating.
Jiangsu THOI Technology Co., Ltd. sits in the Yangtze River Delta with interferometry, high-speed polishing and coating on site. Prototype one ZnSe window or release a yearly laser-lens blanket.
Source factory
R&D, custom and volume under one roof in Changzhou — not a trading desk.
ZnSe specialists
A Chinese factory built around zinc selenide, with ZnS, silicon and chalcogenide on the same line.
Metrology in-house
Interferometers, profilometers and centration towers. Specs you can put on a drawing.
Export ready
English RFQs, coatings documented on witness coupons, packaging for air freight.
Questions buyers ask
- What infrared materials does THOI manufacture?
- ZnSe (zinc selenide) is the house specialty — windows, lenses, aspheres and diffractive elements up to φ400 mm. We also polish ZnS, infrared-grade silicon and chalcogenide glass, plus ZnSe CO₂ F-theta assemblies.
- Do you supply ZnSe optics for 10.6 µm CO₂ lasers?
- Yes. Low-absorption CVD ZnSe is specified for 9.3 and 10.6 µm cutting, welding, marking and medical lasers, with BBAR coatings and F-theta / 3-axis scan heads from the same factory.
- Can I buy infrared windows directly from the factory in China?
- Yes. THOI is a source factory in Changzhou, Jiangsu. Export customers receive English drawings, coating curves and Zygo interferograms with the lot.
- What surface accuracy can you hold on ZnSe?
- Typical catalog: S/D 20/10, PV λ/8 and RMS λ/50 at 632.8 nm on Zygo. Diffractive ZnSe elements have been measured at PV 0.134 µm and RMS 0.01 µm.
RFQ
Send a drawing. Get a number.
English-speaking export desk, typical reply within one business day. Material, diameter, coating and quantity are enough to start — drawings welcome.
- Phone
- +86 159 6179 8491
- Message the factory