V7101 Shortpass Filter
UV-only transmission for high-energy fluorescence excitation and ultraviolet curing applications.
- Passband: Below 90 % T threshold (UV/violet region), T50 ≈ 414 nm
- Cut-off (T50): ≈ 414 nm
- Edge steepness: Steep UV transition
- Blocking: < 0.99 % T above 451 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
V7101 Hybrid delivers Passband Below 90 % T threshold (UV/violet region), T50 ≈ 414 nm, Cut-off (T50) ≈ 414 nm, and Edge steepness Steep UV transition.
The hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
UV curing systems, UV-induced fluorescence excitation, germicidal applications, deep UV analytical instruments.
Description
The V7101 positions its 50 % cut-off at 414.2 nm, passing ultraviolet and near-UV energy with transmission averaging above 74 % from 380 to 412 nm before plunging below 5 % by 432 nm. Blocking holds under 1 % across the entire visible band from approximately 460 nm to 720 nm, with optical density exceeding OD 2 through the bulk of the green, yellow, and red spectrum. A secondary rise appears above 740 nm, reaching roughly 50 % near 745 nm — a characteristic that can be managed with an additional NIR blocker or exploited in dual-band UV/NIR imaging architectures.
Key Advantages
- Sharp 414 nm cut-off – T50 % measured at 414.2 nm with a steep transition that drops from > 80 % to < 5 % in under 20 nm, providing clean separation between UV pass and visible blocking.
- Deep visible-band suppression – Transmission stays below 1 % from 460 nm to 720 nm, delivering OD 2+ rejection across the entire visible window.
- NIR secondary passband – Residual rise to ~ 50 % above 740 nm enables optional dual-band UV/NIR imaging without a second filter, or can be removed with a low-cost blocker.
- 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
- UV fluorescence excitation – Passes UV pump light to the sample while blocking visible background, improving signal-to-noise in UV-excited fluorescence assays.
- DAPI and Hoechst imaging – Selects the 350-410 nm excitation band for nuclear stains while blocking longer visible wavelengths that would reach the detector.
- UV sterilisation monitoring – Isolates germicidal UV-C and UV-A bands for dose measurement in disinfection reactors and water treatment systems.
- Laser line isolation – Cleans up sub-414 nm laser outputs by rejecting spontaneous emission and plasma lines in the visible.
- Dual-band UV/NIR sensing – The natural NIR secondary passband above 740 nm can be used alongside the UV window for simultaneous two-band imaging.
Whether you need prototypes in days or production volumes on schedule, KUPO Optics can manufacture the V7101 to your exact specifications.
FAQ
V7101 FAQ
What is V7101 and what is it used for?
V7101 is a 414 nm Shortpass Filter. The V7101 positions its 50 % cut-off at 414 nm, passing ultraviolet and near-UV energy with transmission averaging above 74 % from 380 to 412 nm before plunging below 5 % by 432 nm. Blocking holds under 1 % across the entire visible band from approximately 460 nm to 720 nm, with optical density exceeding OD 2 through the bulk of the green, yellow, and red spectrum. Common uses include UV fluorescence excitation, Forensic & document analysis, UV curing & photolithography, and Machine vision sorting.
What are the key optical specs of V7101?
Key published specs for V7101 include Passband: Below 90 % T threshold (UV/violet region), T50 ≈ 414 nm; Cut-off (T50): ≈ 414 nm; Edge steepness: Steep UV transition; Blocking: < 0.99 % T above 451 nm (OD ≥ 2); AOI: 0° (normal incidence); custom angles available.
What applications is V7101 best suited for?
V7101 is commonly used for UV fluorescence excitation, Forensic & document analysis, UV curing & photolithography, and Machine vision sorting. UV fluorescence excitation - Isolates near-UV excitation wavelengths while blocking visible leakage, sharpening contrast in fluorescence microscopy and industrial inspection.
Can V7101 be customized for size, substrate, or coating requirements?
KUPO lists the construction for V7101 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 - Available as 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 substrates.
What should I know about angle of incidence and durability for V7101?
The published angle of incidence for V7101 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
