SP560nm narrow bandpass filter, high transmission, low loss fluorescence detection imaging optical component

The SP560 nm filter (collectively referred to as 560 nm Short-Pass / 560 nm Band-Pass) is a precision optical filtering component centered at 560 nm. Utilizing multilayer interference coating technology, it allows efficient transmission of the target wavelength band while deeply blocking other wavelengths. According to industry conventions, "SP560 nm" typically refers to the 560 nm Short-Pass, while "BP560 nm" denotes the 560 nm Band-Pass. The following description focuses primarily on the band-pass type. If it is actually a short-pass type, simply interpret the "transmission band" as 200-560 nm.

I. Working Principle
Using ion beam sputtering (IBS) or magnetron sputtering, alternating layers of TiO₂/SiO₂ are deposited to form a Fabry-Perot resonant cavity structure. This creates constructive interference for light waves around 560 nm, while other wavelengths are reflected or absorbed due to destructive interference, achieving narrowband selection.

II. Key Parameters
• Center Wavelength (CWL): 560 nm ±2 nm
• Bandwidth (FWHM): 10 nm, 25 nm, 40 nm options (narrowband/mid-band)
• Peak Transmittance: T ≥ 93% (band-pass type); short-pass type averages T ≥ 90% in 400-550 nm
• Blocking Depth: OD6 (average out-of-band attenuation ≤ 0.0001%)
• Blocking Range: OD ≥ 5 across full spectrum of 200-1100 nm (typical value)
• Angle of Incidence: 0° ±5°; CWL shifts ~1 nm/° toward shorter wavelengths as AOI increases
• Substrate Material: UV-grade fused silica (JGS1) or B270 optical glass
• Dimensions: Standard sizes D12.5 mm, D25 mm, D50 mm; thickness 1.0-3.0 mm
• Surface Quality: 40-20; surface figure λ/10 @ 632.8 nm; parallelism <30″
• Operating Temperature: -40 ℃ to +85 ℃ with no coating cracking; CWL shift <1 nm
• Laser Damage Threshold: ≥ 1 J/cm² (532 nm, 10 ns, 10 Hz)