FBH700-10

• 700 nm center wavelength (CWL) for selective transmission around the 700 nm spectral region.
• 10 nm full width at half maximum (FWHM) for narrowband wavelength selection.
• High transmission: >90% at the 700 nm center wavelength.
• Hard-coated construction provides a durable coating suitable for demanding optical applications.
• High blocking performance: Optical density >5 outside the passband from 200–684 nm and 716–1200 nm.
• Ø25.0 mm outer diameter with a Ø21.1 mm clear aperture for use with standard 1" optical mounts.
• High optical quality: 60-40 scratch-dig surface quality.
• Low transmitted wavefront error: ≤158.2 nm RMS over the clear aperture.
• Designed for applications requiring precise spectral isolation and narrow wavelength selection.

The Thorlabs FBH700-10 is a hard-coated bandpass filter designed to transmit a narrow spectral band centered at 700 nm while strongly attenuating wavelengths outside the passband.

With a 10 nm FWHM bandwidth, the filter provides selective transmission around the 700 nm wavelength region, making it suitable for applications where unwanted wavelengths need to be effectively rejected while maintaining high transmission of the desired signal.

The filter provides greater than 90% transmission at 700 nm and an optical density greater than 5 across the blocking regions from 200 to 684 nm and 716 to 1200 nm. This high level of out-of-band rejection makes it useful for fluorescence detection, spectroscopy, imaging, and other optical measurement systems requiring effective spectral filtering.

The filter has a 25.0 mm diameter and a 21.1 mm clear aperture, allowing it to be integrated into standard 1" optical mounts and optical systems. Its hard-coated design provides improved coating durability compared with conventional soft-coated interference filters.

Product Type: Hard-Coated Bandpass Filter
Part Number: FBH700-10
Outer Diameter: 25.0 mm (Ø1")
Clear Aperture: 21.1 mm
Center Wavelength (CWL): 700 nm
Center Wavelength Tolerance Typically: ±0.5%
FWHM Bandwidth: 10 nm
Transmission at CWL: >90%
Blocking Range: 200–684 nm and 716–1200 nm
Blocking Performance OD: >5
Transmitted Wavefront Error: ≤158.2 nm RMS
Surface Quality: 60-40 Scratch-Dig
Coating Type: Hard-Coated Bandpass
Design Angle of Incidence (AOI): 0°
Approx. Thickness: 3.5 mm
Approx. Weight: 3 g

Note: The center wavelength is nominal. The actual center wavelength may vary from the stated value, although it is typically within ±0.5%. Specifications are given for 0° angle of incidence.

The FBH700-10 is suitable for a variety of optical and photonics applications requiring narrowband spectral selection, including:

• Fluorescence Detection
• Fluorescence Microscopy
• Spectroscopy
• Optical Imaging
• Scientific Imaging Systems
• Photoluminescence Measurements
• Raman and Spectral Measurement Systems
• Laser and Photonics Systems
• Optical Signal Isolation
• Wavelength-Selective Detection
• Biomedical and Life Science Instrumentation
• Research and Laboratory Optical Systems

The narrow 10 nm FWHM passband is particularly useful when the system needs to isolate a specific spectral region around 700 nm while suppressing unwanted broadband or out-of-band light.