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Description

The FOGMPC20-A multipass cell is a Herriott type absorption cell. It lends itself to applications which require a long interaction path between an electromagnetic wave and a gaseous sample, keeping the overall dimensions of the experimental apparatus reasonable. An incoming beam undergoes multiple reflections between two mirrors, describing two circles of spots on the mirror surfaces. The total number of 150 passes corresponds to an optical path length of 20.0 m. In one of the mirrors, a hole is provided for beam entrance and exit (diameter 4 mm). The dimensions of the mirrors, the separation of individual spots and the diameter of the entrance/exit hole have been chosen such as to avoid overlap of the spots up to a wavelength of 3 μm (distance between adjacent spots ≥ 6 × beam waist). The beam enters the cell in the horizontal plane. The fraction of the beam reflected by the entrance window also propagates in the horizontal plane and can be used for reference (e.g. wavelength measurement). The output beam travels upwards. Therefore, the three beams are clearly distinguished, which ensures an easy, accurate and unambiguous absorption measurement even in case of misalignment or incorrect focussing. The cell base and the alignment is designed with Fiber coupled with the SMF-28E Fiber.And you just need one Senko Fiber adapt to Connect the DFB Laser diode with our multipass cell.What’s more,we build-in Detector and amplifier circuit into our cell,The detector can output voltage signal Directly.You just need one SMA-BNC power line to connect Lock-in amplifier with the Detector(Refer as PIC-B).