Tunable Narrow Bandpass Fabry-Perot Filters

• Company: Thorlabs Inc.
• Type: Filters
• Filter Category: Bandpass Filter
• Applications: Scientific Research, Other
• Wavelength Range: 550-845 nm or 845-1300 nm
• Mirror Substrate: UV Fused Silica
• Transmission: >80%
• Free Spectral Range: 30 GHz
• Cavity Length: 5 mm
• Finesse: >300

Thorlabs' FPQFA series Tunable Narrow Bandpass Fabry-Perot Filters are ideal for filtering low-light emission spectra over a narrow wavelength range of about 0.1 nm (for a 1 μm wavelength laser) or free spectral range (FSR) of 30 GHz. The Fabry-Perot filters are based on a non-confocal cavity composed of two high reflectivity mirrors, one planar and one spherical concave. The frequency transmitted by the cavity can be tuned by adjusting the length of the mirror separation using a piezoelectric transducer.

The filters have optical coatings for wavelength ranges from 550 - 845 nm and 845 - 1300 nm, typical ranges for the photoluminescence spectra of Si and NV centers in diamond and InGaAs quantum dots.

The filter's >80% transmission, 30 GHz FSR, and <100 MHz resolution allow for the investigation of the spectral fine-structures of these low-light quantum emitters.


These filters do not include additional accessories, allowing flexibility to customize their use according to application.