• 10 GHz FSR Fabry-Perot Interferometer
• Designed for 1800 – 2500 nm Wavelength Range
• Confocal Fabry-Perot Design
• Ultra-Stable Athermal Invar Cavity
• Low Scan Voltage
• Ø1” Mounting Flange

This Scanning Fabry-Perot (FP) Interferometer is a high-finesse spectrum analyzer that is frequently used to examine the fine structure of the spectral characteristics of CW lasers. The SA210-18B has a free spectral range of 10 GHz and is designed for wavelengths between 1800 – 2500 nm. The confocal FP cavity acts as a very narrow bandpass filter. The transmission wavelength of the cavity is tuned by adjusting the length of the cavity using piezoelectric transducers, which are driven using the SA201 controller or an equivalent function generator. The transmitted light intensity is measured using a photodiode, amplified by the transimpedence amplifier in the SA201 (or equivalent amplifier) and then displayed/recorded by an oscilloscope or data acquisition card.

The confocal design of the FP Interferometer cavity is relatively insensitive to the alignment of the input beam. As a result, the optical axis of the FP Interferometer can be aligned with sufficient accuracy to the input beam by mounting the interferometer on a standard kinematic mirror mount.

• Wavelength Range: 1800 – 2500 nm
• Free-Spectral Range: 10 GHz
• Finesse: 150 (180 Typ.)
• Resolution: 67 MHz
• Beam Diameter: 150 µm (Max)
• Cavity Length: 7.5 mm
• Mirror Substrate: UV Fused Silica