M4905 Broadband Notch Filter
Broad notch suppression of yellow-green light with excellent passband recovery near spectral edges.
- Notch centre: 536.9 nm
- Notch width (FWHM): 180.0 nm
- Notch depth: OD ≥ 2.5 (T < 0.304%)
- Passband transmittance: ≥ 81.7% T (outside notch region)
- Edge steepness: ~28.5 nm (90 → 10 % per edge)
- Passband recovery: Within 15 nm of notch edges
- AOI: 0° (normal incidence); custom angles available
- Construction: Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick
- Custom options: Centre tuning, notch width adjustment, multi-notch designs, rapid prototypes
Learn more
M4905 Hybrid delivers Notch centre 536.9 nm, Notch width (FWHM) 180.0 nm, and Notch depth OD ≥ 2.5 (T < 0.304%).
The hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Multi-wavelength imaging systems, fluorescence background suppression, thermal imaging platforms, and general-purpose yellow-green rejection applications.
Description
The M4905 delivers versatile spectral performance with a 180 nm notch spanning 464-597 nm and peak transmission of 95.8 %. Operating at 0.3 % depth at 519 nm, this filter transmits 91.4 % in the blue region and 94.4 % in the red-NIR band. Its balanced design supports fluorescence microscopy, Raman spectroscopy, and integrated optical systems requiring broad wavelength coverage with minimal optical complexity.
Key Advantages
- Highest Transmission - 95.8 % peak efficiency across both passbands maximizes signal-to-noise ratios in sensitive detection
- Extended Notch Width - 180 nm blocking band provides complete isolation of green, yellow, and orange wavelengths
- Robust Hard-Oxide Coatings - Ion-assisted multilayer design ensures durability under high-power laser exposure and environmental stresses
- Comprehensive Format Support - Available in round, square, and free-form shapes; substrates include Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG
- Consistent Blue Passband - 385-441 nm transmission supports diverse violet and blue fluorophore applications
Typical Applications
- Multiphoton Microscopy - Separates two-photon excited blue fluorescence from red indicator channels
- Raman Spectroscopy - Blocks 532 nm excitation while transmitting Stokes and anti-Stokes Raman signals
- Multispectral Fluorescence - Enables simultaneous detection of multiple fluorophores in complex biological specimens
- Laser Blocking Applications - Provides extreme attenuation of green laser scatter in laser-excited fluorescence systems
- Color-Separated Imaging - Creates distinct magenta channels in consumer electronics and AR display optics
Prototyping available in 2-3 weeks; production scaling accommodates high-volume OEM requirements with superior coating consistency.
FAQ
M4905 FAQ
What is M4905 and what is it used for?
M4905 is a 447/627 nm Notch Filter. The M4905 delivers versatile spectral performance with a 180 nm notch spanning 464-597 nm and peak transmission of 95.8 %. Operating at 0.3 % depth at 519 nm, this filter transmits 91.4 % in the blue region and 94.4 % in the red-NIR band. Common uses include Multiphoton Microscopy, Raman Spectroscopy, Multispectral Fluorescence, and Laser Blocking Applications.
What are the key optical specs of M4905?
Key published specs for M4905 include Notch centre: 536.9 nm; Notch width (FWHM): 180.0 nm; Notch depth: OD ≥ 2.5 (T < 0.304%); Passband transmittance: ≥ 81.7% T (outside notch region); Edge steepness: ~28.5 nm (90 → 10 % per edge).
What applications is M4905 best suited for?
M4905 is commonly used for Multiphoton Microscopy, Raman Spectroscopy, Multispectral Fluorescence, and Laser Blocking Applications. Multiphoton Microscopy - Separates two-photon excited blue fluorescence from red indicator channels.
Can M4905 be customized for size, substrate, or coating requirements?
KUPO lists the construction for M4905 as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. Published custom options include Centre tuning, notch width adjustment, multi-notch designs, rapid prototypes. Comprehensive Format Support - Available in round, square, and free-form shapes; substrates include Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG.
What should I know about angle of incidence and durability for M4905?
The published angle of incidence for M4905 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
