• Graph showing the transmission verses wavelength for a bandpass filter with a central wavelength of 428nm and a FWHM of 2.5nm.
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BP428-2.5 Bandpass Filter(CWL=428nm,FWHM=2.5nm)

BP428-2.5 Bandpass Filter(CWL=428nm,FWHM=2.5nm)

PN:SO3010136

$100.00 USD
$100.00 USD
Sale Sold out
Shipping calculated at checkout.
Center Wavelength (CWL) // FWHM
Optical Density // Peak Transmission (Tpk)
Dimension

Ultra-Narrow Violet Bandpass Filter for Precision Spectroscopy

The BP428-2.5 Bandpass Filter represents the pinnacle of spectral precision with a center wavelength of 428nm and an ultra-narrow 2.5nm full width at half maximum (FWHM). This high-performance filter delivers exceptional wavelength selectivity for the most demanding analytical and research applications.

Key Features:

  • Center Wavelength: 428nm (deep violet spectrum)
  • Ultra-Narrow Bandwidth: 2.5nm FWHM for maximum selectivity
  • Exceptional Purity: Superior spectral isolation
  • Sharp Cut-offs: Precise wavelength boundaries
  • Research Grade: Engineered for critical measurements

Specialized Applications:

  • High-resolution spectroscopy and analysis
  • Laser line isolation and purification
  • Precision fluorescence excitation
  • Atomic emission spectroscopy
  • Advanced scientific instrumentation
  • Quantum optics and photonics research

Technical Excellence:

The 2.5nm bandwidth provides unmatched spectral purity, isolating a precise 426.25-429.75nm window in the violet spectrum. This ultra-narrow passband is essential for applications requiring the highest level of wavelength discrimination and minimal spectral contamination.

When your research demands absolute precision and spectral purity, the BP428-2.5 delivers the performance that separates good results from groundbreaking discoveries. Every photon that passes through this filter is exactly where you need it to be.

Achieve spectroscopic excellence with the uncompromising precision of the BP428-2.5 bandpass filter.

Transmission & OD Data

The transmission curve is typical. Actual data may vary from lot to lot, you can request the raw Transmission and OD data from us.

Copy the link of the product page and send email to shop@syronoptics.com to get raw data.

Shipment & Delivery

For stocked products, shipment will usually be made within 5 working days after order.

For customized products, shipment will usually be made within 4-8 weeks after order.

Return & Refund

Stocked Product are eligible to return within 7 days after receiving.

A flat rate of 35$ will be charged for returning.

Custom Sizing

Custom sizing is available for dimension under 60x60mm. Without mounting the thickness will generally ranging from 0.5-3mm.

For bigger size, contact shop@syronoptics.com for details.

Optical dicing refers to precision cutting processes used to segment optical materials, particularly those with specialized coatings, into smaller functional components while maintaining their structural and optical integrity. In the context of optical coating flats (flat substrates like glass, fused silica, or semiconductors coated with anti-reflective, dielectric, or other optical layers), dicing ensures these coated substrates meet exact dimensional requirements for applications in photonics, lasers, sensors, and semiconductor devices.

Methods

  • Saw Dicing: Diamond-coated blades for clean cuts with minimal chipping.
  • Laser Dicing: Non-contact ablation for delicate or brittle materials, reducing mechanical stress.
  • Plasma Dicing: Dry etching for ultra-fine features, ideal for advanced semiconductor wafers.

Price

Dicing Service will generally cost from $50 to $125 per piece. Depending on the accuracy and size you are requesting.

Packaging

If you need generic packaging, please leave "Generic" in the note when placing order.

In such case:

  • No Branding information in Packaging Materials
  • All Documentation will be generic
  • We will send image of the parcel to you before fulfilling shipment
  • You can use your document template for the shipment.

Feel free to contact shop@syronoptics.com for details.

Payment

Payment could be done online with Credit Card, Apple Pay, Google Pay, Wechat Pay and Alipay

For amount under $200 you can request to make payment within 7days after receiving the order.

View full details

Fequently Asked Questions

What are the Thickness of the Optical Filters?

For Mounted Optics:

  • 6mm (by Default)
  • 3.5mm (Specified in Order Note)

For Unmounted Optics:

  • 0.5mm
  • 1.1mm
  • 2mm

(most of the unmounted optics are having thickness of 1.1mm ~ 2mm)

What is the difference between mountings?

Unmounted:

  • a bare glass optical filter

Mounted:

  • Smooth Mount for protection of the optics. No thread is there on the mount.

Metric Mount:

  • Start with M as prefix, usually seens as M25.5x0.5mm. Mostly used as camera filters

Imperial Mount (Usually Thorlabs):

  • Start with SM as prefix, usually seen SM1, SM05 etc... Mostly used in Optical system. (You will have a SM external thread to connecting to other objects)

C-Mount:

  • Very frequently used mounting. C-Mount is 1‘’-32TPI. And it is not the same thing as SM1, or M25.5x0.5mm.

Standard Mountings

Camera Mounting List

  • Our filters can be cut to match the mounting on the list. Please contact us for getting quotation.

Need any help?

Other Wavelength

UV Bandpass Filter (100-400nm)

VIS Bandpass Filter (400-800nm)

NIR Bandpass Filter (800-1400nm)