M4905 Broadband Notch Filter
Double-pass notch filter passing vivid violet (390 – 445 nm) and rich red (630 – 750 nm) while pushing green-cyan light below 1 % for a pure magenta spectrum.
- Violet passband: 390 – 445 nm, > 90 % T
- Deep notch: < 1 % T 470 – 605 nm
(valley ≈ 0.2 % T) - Red passband: 630 – 750 nm, 92 – 95 % T
- Edge steepness: ~15 nm 90 → 10 % transitions
- Construction: Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick
- Custom options: Ripple smoothing, AOI tuning, rapid prototypes
Learn more
M4905 transmits two clear windows—near-UV/violet (~390 – 445 nm) and orange-to-deep-red (~630 – 750 nm)—while driving the entire
green-cyan band down to detector noise. Transmission exceeds 88 – 92 % through the violet, drops below one
percent from ~470 nm to 605 nm, then rockets past 90 % again by ~630 nm and rides 92 – 95 % out beyond 750 nm.
Rugged ion-assisted hard-oxide coatings shrug off heat, humidity, solvents, and repeated cleaning. KUPO coats
Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG in any outline—from 5 mm chips to 450 mm plates,
0.21 – 3.8 mm thick—and can ship prototypes in about two weeks.
Typical uses: violet-excite/red-detect fluorescence, magenta stage lighting, UV + red machine-vision,
green-band suppression in Raman or multispectral sensors, and AR/HUD optics that need violet tracking plus red
graphics without mid-visible clutter.
Description
M4905 transmits two clear windows—one in the near-UV/violet band and another in the orange-to-deep-red—while pushing almost all green-cyan light down to instrument noise. Measured transmission is already above 88 – 92 % from about 390 nm to 445 nm, then collapses to below 1 % through roughly 470 nm – 605 nm. It rockets past 90 % again by ~630 nm and stays between 92 % and 95 % out beyond 750 nm. The result is a vivid magenta spectrum that keeps violet excitation and red emission (or violet + red lighting) bright yet dumps the mid-visible clutter.
Key advantages
-
Deep mid-band notch – < 1 % T across ~470 nm – 605 nm suppresses green autofluorescence and ambient glare.
-
High dual passbands – > 90 % T in 390 – 445 nm and 630 – 750 nm keeps violet sources and red detectors at full power.
-
Broad blocking floor – Mid-band floor down to ~0.2 % boosts signal-to-noise in demanding imaging tasks.
-
Hard-oxide durability – Ion-assisted coating endures heat, humidity, solvents, and repeated cleaning.
-
Tailor-made formats – Round, square, or free-form blanks from 5 mm to 450 mm, thickness 0.21 – 3.8 mm, on Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG glass.
Typical applications
-
Fluorescence microscopy & flow cytometry – Pass violet excitation and red emission while silencing green background for crisper images.
-
Raman & multispectral sensors – Block a 532 nm or 561 nm laser line yet keep violet and red Stokes/anti-Stokes signatures.
-
Stage & architectural lighting – Create saturated magenta washes (violet + red) with virtually no green spill.
-
Machine-vision systems – Combine UV crack detection with red contour lighting while eliminating mid-band reflections.
-
AR / HUD optics – Inject violet tracking beams and red graphics while leaving the central visible band dark to the user.
Need prototypes in days or production runs next quarter? M4905 filters can be coated, diced, and shipped to your exact specification—fast.
