Wavelength in Raman

A final consideration for the selection of excitation wavelength in Raman spectroscopy is the efficiency of the silicon-cased charge-coupled device (CCD) detector. Due to silicon absorption, CCD detectors are prohibitively inefficient above 1000 nm. As a result, 785 nm or, more recently, 830 nm are often chosen as the excitation wavelength to fully exploit the diagnostic window while retaining an acceptable quantum efficiency detector. 

The excitation wavelength in Raman spectrometry must be carefully chosen. Not only is photodecomposition and fluorescence a problem but colored samples... 

---