The L-FTS from Lasnix is a Fourier Transform IR (FTIR) Spectrometer that operates at a wavelength of 0.4 µm - 300 µm. It has a spectral resolution of 6.3 cm^-1 with an optional resolution of 3.4 cm^-1. This spectrometer has a clear aperture of 17 mm diameter and an intensity limit of 2 W/cm². It has a built-in window-less thermal detector with a power limit of 10 mW. This spectrometer features a novel permanently aligned lamellar mirror technology and includes a mini-notebook for online Fourier transformation up to 2 spectra/s as well as for averaging, ratioing and storing spectra.

The L-FTS has internal sample holders that enable transmission and reflection measurements with a user-supplied beam. This spectrometer has a second optical port that allows external access to the interferometer for a user-supplied optical system for, e.g., double-pulse generation or autocorrelation scans to 7 ps. It is available in a benchtop module that measures 15 x 12 x 7 cm³ and is ideal for continuous spectral monitoring of a collimated light beam, simultaneously from the visible to the far infrared in a single display, requiring no adjustments of its dispersion-free internal beamsplitter-optics-detection system, with a minimal footprint on the optical table.