PicoQuant’s FluoTime 300 fluorescence lifetime spectrometer is now available with double monochromators in excitation and emission. Due to the very high stray light rejection of these monochromators, the signal to noise ratio of the spectrometer is increased to more than 29.000:1 (RMS) using the standard water Raman test. Even samples with a very high scattering contribution can now be studied with extreme sensitivity and ultimate temporal resolution.
Both monochromators are supplied with special features. For the excitation monochromator, an additional motorised filter wheel is installed to suppress the second order that could lead to parasitic signals. The emission monochromator on the other hand can be used in two modes: additive and subtractive.
The additive mode is ideally suited for applications that require an extremely high spectral resolution. Values as high as 0.15nm can be reached and enable, for example, measurements of complex molecular systems, organic semiconductor hybrids, or up conversion materials.
The subtractive mode substantially improves the temporal resolution of the spectrometer and is therefore the ideal for studying very short fluorescence lifetimes. An instruments response function (IRF) of the system as short as 60ps (FWHM) can be reached already in combination with a picosecond pulsed diode laser and a PMA hybrid detector. This very low value permits the resolving of fluorescence lifetimes below even 10ps.