The spectrum attached is obtained from LabRAM HORIBA Raman spectrometer. We can see the photon counts for energy between 1.4 eV and 1.5 eV is less than zero.
Dear Peter Kapusta, the graph I posted here hasn't been processed, It is actually pristine as it is produced by the LabSpec software after conducting the experiment. May be I don't understand the working mechanism of the software.
Dear Tuhin Khan, you've pointed out something crucial. But I still don't know where to perform autozero/ setzero. Is it in the LabSpec software or is it in the data manipulating software like Origin?