The 1535 nm bandpass filter is a near-infrared narrowband optical component specifically designed for a center wavelength of 1535 nm, with a typical bandwidth of 3–40 nm. It achieves a transmittance of >90–95% within this band, while offering a blocking depth of OD3–OD6 in ranges such as 900–1505 nm and 1578–1750 nm, effectively suppressing background and stray light.

The product employs ion beam sputtering coating technology, featuring a high laser-induced damage threshold (≥1 J cm?2, 10 ns) and the ability to operate over a wide temperature range (–40 °C to +70 °C or broader). Common specifications include dimensions of Φ10 mm×1 mm, a clear aperture >95%, an incident angle of ±14.5°, with customizable sizes;