HM-725 is a broad-band hot-mirror that passes visible light with virtually no colour cast. From 420 nm up to about 720 nm the filter delivers a flat >90 % transmittance plateau; beyond 760 nm residual IR is driven below 1 %. A small, well-controlled secondary window near 1.15 µm keeps thermal run-up low without compromising most detector arrays.
Key advantages
True-colour visible passband – 420 – 720 nm at >90 % maintains luminance and hue fidelity in camera, projector and sensor paths.
Sharp 725 nm edge – dielectric stack creates a <25 nm transition for crisp separation of VIS and IR channels.
Deep IR suppression – <1% out to 1.1 µm reduces haze, flare and thermal loading on optics or imaging chips.
High-temperature options – choose Borofloat®, Eagle XG or ultra-thin D263 T glass (0.21 – 3.8 mm) for service up to 450 °C, or cost-effective soda-lime below 150 °C, all custom-cut from 5 mm to 450 mm.
Rugged hard coating – MIL-M-13508C-compliant surfaces resist cleaning abrasion and humidity cycling for long field life.
Typical applications
CMOS / CCD cameras – keep IR from fogging daylight images while preserving sensor quantum-efficiency over the visible.
Laser-based projectors – dump 808- 1064 nm stray energy, protecting phosphor wheels and maintaining colour balance.
Display backlights & light-pipes – enhance brightness reliability by reflecting heat out of the optical cavity.
Spectroscopy & fluorescence – isolate visible emission lines without IR background for higher SNR.
Head-up and AR combiners – manage thermal budget in compact waveguides or light-engine subsystems.
Need fast prototypes or high-volume lots? We dice, edge-polish and ship HM-725 filters to your exact spec—on your bench when you need them.