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Fiber coupled 20m optical path Multipass Herriott Type Cell
Category: TDLAS COMPONENTS  Publish Time: 2017-01-06 01:48 

Fiber coupled 20m optical path Multipass Herriott Type Cell
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 Part NO. : IDP-PIC-X
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Fiber coupled 20m optical path Multipass Herriott Type Cell




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).



PIC-A PIC-B

Outstanding Features 

● Long Optical path length 20.0m 
● Clear input/output beam separation 
● No interference fringes for λ < 3 μm 
● Small volume 
● Easy maintenance and refurbishment of mirrors 
● “In situ” removal of inner tube
● Compact and rugged design 
● OEM version on request Light
● Fiber Coupled Input,No need to align the optical path
● Build-in Detector and amplifier circuit,output voltage signal Directly 


Light pattern on the input mirror of the Microphotons Herriott cell
when illuminated with a HeNe-laser


Measurement of atmospheric methane (CH4) for 2 consecutive days



TDLAS-2f Signal Curve


The accessories for the Cell 


General Specifications 

Parameter

Value

Units

Optical path length

20.0

m

Cell Volume

571

cm3

Overall length

29.0

cm

Overall height

7.0

cm

Overall width

6.0

cm

Mirror reflectivity (λ > 1 μm)

> 99.8

%

Transmission (window excluded, λ > 1 μm)

> 26.6

%

Operating pressure

10-3÷760

Torr

Window transmission (CaF2)

0.2-9.5

μm

Coupling fiber Type

SMF-28E

NA

Mirror Coating

HR

 

Operation wavelength

1510~1750

nm

Gas Interface

Φ6 Tube

 

Insertion Loss

<2

dB

Return Loss

60

dB

Weight

2.6

kg


Dimensions




Details for our Products





OEM cells and other types

One multi purpose cell. Special versions like OEM cells or multipass cells for harsh environment or aeronautical applications are available on request. 

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