CM-900 Cold Mirror & Longpass Filter
CM-900 is a cold mirror, near-IR longpass: transmission stays near baseline through ~300–880 nm (≤1 % T with a few low single-digit resonant spikes), then rises steeply ~890–910 nm to a high IR passband of ~95–96 % T from ~920–1120 nm, easing to ~80 % T by ~1.20 µm—reflecting VIS, passing IR.
- Function: VIS-reflecting / NIR-transmitting longpass (cold mirror)
- VIS leakage: ≤1 % T to ~880 nm; few low single-digit resonant spikes
- Edge position: Steep 10→90 % rise at ~890–910 nm (~900 nm class)
- IR throughput: ~95–96 % T ~920–1120 nm; ~80 % T by ~1.20 µm
- Durability: Low-scatter hard dielectric; abrasion & humidity resistant
- Substrates & format: Borofloat®, Eagle XG, D263 T, or soda-lime; 5–450 mm • 0.21–3.8 mm; options: rear-AR & slight wedge
Learn more
CM-900 reflects visible back into the beam while venting IR to dumps or sensors—cooler optics with predictable IR power. The sharp ~900 nm edge cleanly splits paths and the smooth passband simplifies detector calibration.
Typical applications • Illumination optics & light engines (reflect VIS, vent IR heat) • Projectors & cinema lamps (protect phosphor wheels/LCD/LCOS) • Microscopy & biomedical lighting (cooler epi-illumination, head-lamps) • Machine-vision illuminators (deliver IR to sensors, keep VIS out) • Architectural & entertainment lighting (boost visible output, manage temperature).
Need test chips tomorrow or thousands next quarter? CM-900 cold-mirror longpass filters are coated and cut-to-size (including dicing) to your exact spec—fast.
Description
CM-900 is a cold mirror, near-IR longpass. It reflects the visible band and passes infrared: transmission stays near the baseline through ~300–880 nm (generally ≤1% T with a few low single-digit resonant spikes), then rises steeply around ~890–910 nm to a high IR passband of ~95–96% T from ~920–1120 nm, easing to ~80% T by ~1.20 µm.
Key advantages
-
High IR throughput — ~95–96% T from ~920–1120 nm supports efficient thermal management and IR sensing.
-
Steep ~900 nm edge — rapid 10-to-90% rise cleanly separates reflected VIS from transmitted IR.
-
Low VIS leakage — near-baseline transmission across the visible for effective cold-mirror operation.
-
Stable passband — smooth IR region simplifies power delivery and detector calibration.
-
Durable dielectric stack — abrasion and humidity resistant for field, stage, and lab use.
-
Flexible glass choices — Borofloat®, Eagle XG, or D263 T (0.21–3.8 mm) for high-temp duty to ~450 °C; soda-lime for ≤150 °C. Custom sizes 5–450 mm; rear-surface AR and slight wedge available to suppress ghosts.
Typical applications
-
Illumination optics & light engines — reflect bright VIS into the beam while venting IR heat.
-
Projectors & cinema lamps — protect phosphor wheels, LCD/LCOS engines, and dichroics from thermal load.
-
Microscopy & biomedical lighting — cooler epi-illumination and head-lamps.
-
Machine-vision illuminators — deliver IR to sensors while keeping VIS out of the path.
-
Architectural & entertainment lighting — boost visible output and manage fixture temperature.
Need test chips tomorrow or thousands next quarter? CM-900 cold-mirror longpass filters are coated and cut-to-size (including dicing) to your exact spec—fast.
