The Arcspectro HT is a static Fourier transform spectrometer (FTS) that is based on a licensed concept that uses the polarization properties of the light and the optical properties of crystals). It provides a extremely high throughput (sensitivity) and does not need external optics to be used. The Arcspectro HT is ideal for the measurement of low light, diffuse reflection and also in fields like fluorescence or Raman spectroscopy.

What makes the ARCspectro-HT spectrometer so exclusive?

ARCspectro HT is ideal for low light applications or for the spectral analysis of diffusing light sources (or samples). Its unique design permits to gather a maximum of light over a large diffusing surface (several millimeters!) and over a large angle (±10°). This gives a tremendous throughput advantage (~100x more) compared to the most powerful grating spectrometers (also well-known Jaquinot advantage) which are intrinsically limited by a small entrance slit (typically 0.025mm). This makes this unique device ideal for applications were small light intensities has to be analyzed (fluorescence or Raman spectroscopy).

Overview of the ARCSpectro HT Models:

Choose the right model for your needs!
ARCSpetro HT series contains three different models with different detector arrays having different properties. The table below gives an overview:

ARCSpetro Models	Detector Array	Features	Applications
HT-HR High Resolution	Toshiba TCD 1304 3648 Pixels CCD.	- High Throughput - < 1nm @ 550nm	- Peak position Measurement - Need for Higher resolution
HT-2D 2D detector High SNR High dynamic	CMOS 2D camera 1024x1248 Pixels	- High Throughput - 1024 Measurements    in one shot - Compact - Short Integration    Time (50ms) - High Dynamic range	- Diffuse Reflection with   sufficient light - High SNR, High Stability - Need for High dynamic   range

How does it works?

  The ARCspectro HT series is static (so no moving scanning parts) FTS based on a so-called common path polarization interferometer. The hart of Arcspectro HT is a monolithic bloc constituted of high-end crystal prisms and polarizers that are transparent over a very large spectral band (UV-VIS-NIR). The spectral dependent intensity pattern (interference pattern) created at the output of the bloc is recorded with a CCD detector array and the spectrum is calculated by the computer via a Fourier transform algorithm and calibration tables.

The diffusing light (over a diameter of 4mm) can directly enter the device and so it does not need to pass trough a narrow entrance slit (generally of 25mm for an equivalent resolution and comparable acceptance angles) as for the conventional commercially available grating spectrometers. This explains the tremendous throughput advantage (between 50 and 100x more!) of the ARCSpectro-HT.
Notice also that fiber and collimation optics are not absolutely necessary, this may be an advantage for certain applications where cumbersome and lossy optics are not desired.

Compared with a conventional grating Spectrometer?

Compared to conventional grating spectrometers, The arcspectro-HT (and all the other FT spectrometerrs) has many advantages. The most important is its a high resolution (0.7 nm @ 500nm) for a broad wavelength range (400nm-1050nm) and for an entrance aperture of 4mm!!! Also FTS do not need second and third order rejection filters on the detector which causes spectral distortions and absorptions.

Another important advantage the arcspectro-HT is the simplicity of the optical setup: The user can directly illuminate the 4mm entrance window  with the light to be spectrally analyzed. There is no need for cumbersome and expensive optics for coupling the light into a small optical fiber as it is the case for conventional grating spectrometers. Also, if necessary, the light can be directly injected in the arcspectro-HT via a thick light guide that is connected to the entrance.

Some application examples:

The ARCspectro HT series is delivered with a free windows XP,98,2000, compatible program.
The software recognize automatically the spectrometer (USB plug and play system) and
is able as other conventional spectrometer software to:

• Display real time spectral measurement results
• Configure measurement parameters (integration time, averaging).
• Choose Transmission or Reflection mode
• Usual features such as save, open, zoom, rescale...
• Some specific features related to Fourier transform spectrometry: choose apodization (automatic recognition option), look and save the interferograms.