hi,we want to build an Ultrafast Transient Absorption Spectrometer system, how to choose a spectrometer?
We already have femtosecond lasers system (coherent) ,pump probe system(home built), white light white-light supercontinuum(use CaF2 or Al2O3)，
We don't know how to choose a suitable spectrometer, what products can be recommended?
We would appreciate it if you could help.
Mainly the spectrometers are chosesn on the basis of wavelength of interest and their resolution for that perticular range. Integration time and trigger also plays role.
If you are looking for 200-1100nm range then ocean optics HR2000 (resolution ~ 0.5 nm) or HR4000 are good. You can customize these as per your need. You can also look BWTek spectrmetrs. These are fiber coupled.
It is helpful to have a spectrometer that allows you to simultaneously take a spectrum of a portion of the incident probe (before passing through the sample) as well as the modified probe (after passing through the sample) for a true shot-to-shot normalization. The alternative is to acquire the incident and modified probe spectra on alternate shots. This requires detector electronics that allow you to trigger, acquire, and readout spectra from individual shots.
It depends a bit on whether you want to measure a spectrum per single laser pulse, or integrate the spectra of several consecutive pulses into one average spectrum.
In general, an Echelle grating in combination with a 2D detector array (like a camera chip) is recommendable for fast pulses. If you want to integrate several pulses, then an integrating camera chip like a CCD is best. If you, however need individual pulse spectra, then a CMOS camera chip is best.
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