V79902 Shortpass Filter
Blue-violet isolation for fluorescence microscopy and narrow-band excitation systems.
- Passband: 400 – 444 nm, 90.0 – 93.0 % T (± 1.5 % ripple)
- Cut-off (T50): ≈ 452 nm
- Edge steepness: ~14 nm (90 → 10 % transition)
- Blocking: < 0.97 % T above 465 nm (OD ≥ 2)
- AOI: 0° (normal incidence); custom angles available
- Construction: Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick
- Custom options: Edge tuning, ripple smoothing, 45° AOI, rapid prototypes
Learn more
V79902 Hybrid delivers Passband 400 – 444 nm, 90.0 – 93.0 % T (± 1.5 % ripple), Cut-off (T50) ≈ 452 nm, and Edge steepness ~14 nm (90 → 10 % transition).
The hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Fluorescence microscopy, 405/445 nm laser systems, blue LED excitation filtering, confocal imaging.
Description
The V79902 delivers a clean shortpass profile with its 50 % cut-off measured at 452 nm. The passband spans 380 to approximately 449 nm with average transmission exceeding 90 %, peaking at 93 % near 439 nm. Beyond the transition edge, transmission drops below 1 % by 459 nm and remains suppressed across the entire visible and near-infrared range out to 780 nm, averaging under 0.6 % through the blocking region. This makes the V79902 one of the sharpest violet-pass filters in the KUPO shortpass lineup.
Key Advantages
- Steep 452 nm transition – Cuts from > 90 % to < 1 % in under 10 nm, minimizing spectral crosstalk between violet pass and visible rejection.
- Peak transmission 93 % – Reaches 93 % near 439 nm, ensuring efficient throughput of violet and near-UV energy.
- Broadband blocking to 780 nm – Maintains < 1 % transmission from 459 nm through the full visible and NIR range — no secondary leaks.
- Hard-oxide durability – Ion-assisted sputtered hard coating resists environmental degradation and repeated cleaning cycles.
- Custom 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
- Violet laser line clean-up – Isolates 405-450 nm laser emission from plasma lines, broadband lamp background, and longer-wavelength spontaneous emission.
- DAPI and CFP fluorescence excitation – Delivers a clean violet excitation band for DAPI, Hoechst, CFP, and similar blue-shift fluorophores in widefield or confocal microscopy.
- Flow cytometry – Passes the 405 nm violet laser excitation band with clean visible blocking, preventing cross-excitation of longer-wavelength probes.
- UV/visible spectroscopy – Defines the short-visible window for absorbance and emission measurements in the 380-450 nm range.
- Security and forensic imaging – Isolates violet reflection or fluorescence from documents, banknotes, and biological evidence under UV-A illumination.
Need the V79902 customized for your application? KUPO Optics provides rapid prototyping and production-scale manufacturing to your specifications.
FAQ
V79902 FAQ
What is V79902 and what is it used for?
V79902 is a 450 nm Shortpass Filter. The V79902 delivers a clean shortpass profile with its 50 % cut-off measured at 452 nm. The passband spans 380 to approximately 449 nm with average transmission exceeding 90 %, peaking at 93 % near 439 nm. Common uses include Fluorescence microscopy, Semiconductor inspection, Raman spectroscopy clean-up, and Stage & entertainment lighting.
What are the key optical specs of V79902?
Key published specs for V79902 include Passband: 400 – 444 nm, 90.0 – 93.0 % T (± 1.5 % ripple); Cut-off (T50): ≈ 452 nm; Edge steepness: ~14 nm (90 → 10 % transition); Blocking: < 0.97 % T above 465 nm (OD ≥ 2); AOI: 0° (normal incidence); custom angles available.
What applications is V79902 best suited for?
V79902 is commonly used for Fluorescence microscopy, Semiconductor inspection, Raman spectroscopy clean-up, and Stage & entertainment lighting. Fluorescence microscopy - Isolates violet excitation lines (405-445 nm) while rejecting all longer-wavelength ambient and emission light leaking back toward the source.
Can V79902 be customized for size, substrate, or coating requirements?
KUPO lists the construction for V79902 as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. Published custom options include Edge tuning, ripple smoothing, 45° AOI, rapid prototypes. Custom 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.
What should I know about angle of incidence and durability for V79902?
The published angle of incidence for V79902 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
