BP1064-2 Bandpass Filter(CWL=1064nm,FWHM=2nm)

Technical Specifications Analysis

• Center Wavelength (CWL): 1064 nm
• Bandwidth (FWHM): ~2 nm (implied by the "-2")
• Transmission (T): ≥ 80% at 1064 nm (High throughput for the signal)
• Blocking (OD): OD4 (Optical Density 4) from 200 nm to 1200 nm.Meaning: It blocks background light (UV, Visible, and NIR) to 0.01% transmission outside the narrow passband. This wide blocking range is critical for ensuring that sunlight or other light sources do not interfere with the sensor.

Application - LIDAR & Remote Sensing

This is one of the most common applications. 1064 nm is a standard wavelength for LIDAR (Light Detection and Ranging). The filter is placed in front of the detector to block sunlight and other background noise, allowing only the 1064 nm laser reflection to be detected.

Recommended Light Sources

The filter is designed specifically for sources that emit at 1064 nm. Using a broadband source (like a halogen lamp) would result in very low total power throughput because the filter cuts out almost all the light.

• Nd:YAG Lasers (Neodymium-doped Yttrium Aluminum Garnet): The most ubiquitous source for this filter. These solid-state lasers emit a strong primary line at exactly 1064.2 nm.
• Nd:YVO4 Lasers (Neodymium-doped Yttrium Orthovanadate): Another common solid-state laser typically used in diode-pumped systems, emitting at 1064 nm.
• Yb-Doped Fiber Lasers (Ytterbium): While Yb fiber lasers often center around 1030–1100 nm, they can be tuned or fixed to 1064 nm.
• 1064 nm Laser Diodes: Semiconductor lasers manufactured specifically for this wavelength, often used in compact sensors and illumination.

Technical Specifications Analysis

• Center Wavelength (CWL): 1064 nm
• Bandwidth (FWHM): ~2 nm (implied by the "-2")
• Transmission (T): ≥ 80% at 1064 nm (High throughput for the signal)
• Blocking (OD): OD4 (Optical Density 4) from 200 nm to 1200 nm.Meaning: It blocks background light (UV, Visible, and NIR) to 0.01% transmission outside the narrow passband. This wide blocking range is critical for ensuring that sunlight or other light sources do not interfere with the sensor.

Application - Laser Line Cleaning

Placed at the output of a laser source to "clean" the spectrum, removing Amplified Spontaneous Emission (ASE) or side-bands, ensuring only the pure 1064 nm frequency is transmitted.

Recommended Light Sources

• Yb-Doped Fiber Lasers (Ytterbium)

Why they need cleaning: This is the most common application for line cleaning. Fiber lasers are highly efficient but prone to generating high levels of Amplified Spontaneous Emission (ASE).

• Diode-Pumped Solid-State (DPSS) Lasers (Nd:YAG or Nd:YVO4)

Why they need cleaning: While these lasers naturally have a narrow linewidth, they can suffer from pump leakage (residual light from the 808 nm pump diode) or weak secondary emission lines.

• High-Power Laser Diodes (Fabry-Perot)

Why they need cleaning: Laser diodes often exhibit a broader spectral width or "mode hopping" (jumping between slightly different frequencies) depending on temperature and current.