SWIFTS Spectrometer

(Stationary-Wave Integrated Fourier Transform Spectrometer)

SWIFTS is a very compact high-resolution spectrometer. It operates on a wide optical bandwidth (550-1100 nm) and a high measurement rate capability (30kHz). Ideal for monitoring laser emission and for discriminating modes or physical phenomena that conventional spectrometers do not resolve.

Principle:

SWIFTS spectrometer is composed of:

  •  a single-mode optical waveguide formed close to the surface of a glass wafer,
  •  a mirror located at one of the end-faces of the glass chip allowing the creation of a stationary wave (for a monochromatic light input) or a Lippmann interferogram (for a “white” light input) into the waveguide,
  •  a periodic network of nano-dots scattering a small amount of the guided light,
  •  a CCD line camera measuring the optical power scattered by each nano-dot.

 

 

The scattered light is proportional to:

  •  the evanescent field of the guided mode at the glass surface
  •  the dot dimensions and material
  •  the intensity of the Lippmann interferogram at the dot position

The two first parameters can be managed by changing the waveguide or the dots manufacturing processes. They are supposed to be constant along the waveguide. The last one depends on the spectrum of the input light. The knowledge of the interferogram allows precisely determining this spectrum thanks to an FFT calculation.

Packaging and ports: 

The packaging of the spectrometer presents dimensions as low as 8.3 x 8.6 x 12.6 cm3. The optical input is compatible with single mode fibres. Various optical connectors (FC, SC, ST,…) are available.

The communication with a computer is achieved through a Gigabit Ethernet port. An optional trigger module is available.

Performances:

Applications:

  • Laser control
  • Plasma and Raman spectroscopy
  • Laser Induced Breakdown Spectroscopy (LIBS)
  • OEM integration like Distributed Temperature Sensor (DTS) systems

SWIFTS project:

The spectrometer proposed by Teem Photonics was developped in 2009-2011 within the project SWIFTS with several industrial and academic partners. 

This project has been rewarded (“photon d’or”) at the OPTO 2011 conference.

 

If you need more information or more detailed assistance, please contact us.


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