BP260-15 Bandpass Filter(CWL=260nm,FWHM=15nm)

A deep ultraviolet (UVC) optical filter designed to let only a narrow band of light around 260nm pass through, while heavily blocking other UV and visible light.

Specification

• Center Wavelength: 260nm
• Bandwidth: 15nm
• Blocking: OD3 (blocks 99.9% of light) from 200-700nm
• Peak Transmission: >50% at 260nm.

Application - DNA/RNA Analysis

Measuring nucleic acid concentration in lab samples, as DNA and RNA naturally absorb light at exactly 260nm.

Recommended light source: Deuterium Lamp

• Provides continuous, high-intensity light specifically in the deep UV spectrum.
• Highly stable output ensures precise and repeatable sample readings.

This is a specialized optical filter designed to act like a very strict bouncer for light. It only allows a specific type of invisible, deep ultraviolet light (called UVC) to pass through, while completely blocking visible light and other unwanted UV rays.

Specificaton

• Center Wavelength (BP260): Its "sweet spot" is exactly at 260 nanometers (nm), which is deep in the UVC spectrum.
• Bandwidth (-15): It has a "window" of 15 nm. This means it lets light through between roughly 252.5 nm and 267.5 nm.
• Blocking (OD3@200-700nm): "OD3" means Optical Density 3. It blocks out 99.9% of all other light from 200nm to 700nm (which covers other UV light and almost all human-visible colors).
• Transmission (T>50%): It allows more than 50% of the desired 260nm light to successfully pass through the glass.

Application - Germicidal and Sterilization Monitoring

Deep UVC light is used to kill bacteria and viruses in drinking water and hospitals. This filter can be placed over a sensor to measure the exact intensity of the sterilization lights. It ensures the cleaning machines are actually emitting the correct "germ-killing" wavelength at a high enough power to be safe.

Recommended light source:

• Deep UVC LEDs peaking around 255nm-265nm: They are highly energy-efficient, turn on instantly, and their light perfectly matches the window of this filter.
• Low-Pressure Mercury Lamps: These are the traditional "germ-killing" tubes that naturally emit a massive spike of light at 254 nm, which slips right through this filter's 252.5-267.5 nm opening.

A specialized optical window that only allows a very narrow, specific slice of deep ultraviolet (UVC) light to pass through—specifically around the 260-nanometer mark. It acts like a strict bouncer for a camera or sensor, rejecting and blocking almost all other colors and types of light from entering the optical system.

Specification

• Center Wavelength (CWL): 260 nm
• Bandwidth (FWHM): 15 nm
• Blocking: Optical Density 4 (OD4), meaning it securely blocks 99.99% of out-of-band light from 200 nm up to 1200 nm
• Peak Transmission (T): greater than 25% for the allowed 260 nm light

Application - UV Disinfection System Monitoring

UVC light around 260 nm is incredibly effective at destroying the DNA of bacteria and viruses inside water or air purifiers. This filter can be placed in front of a light detector to create a sensor that strictly monitors the intensity of the sterilizing 260 nm light. This ensures the disinfection system is actually working safely and effectively, without the sensor being tricked by normal ambient room light.

Recommended light source - Sterilization Light Sources:

• UVC Germicidal LEDs: These modern LEDs emit light exactly at the 260nm-265nm range where it is most fatal to microbes, and their light output matches perfectly with what this specific filter is designed to let through.
• Low-Pressure Mercury Vapor Lamp: While its primary peak is at 254 nm, it is the most common traditional germicidal light source; a sensor equipped with this 260nm filter can still be used in a broader system to verify the strong presence of deep, sterilizing UV light.