A method for determining a first excitation wavelength λ p 2 and a second excitation wavelength λ p 1 for use in a dual laser spectrometer system comprising: - a first laser source configured to emit a first excitation wavelength and a second laser source configured to emit a second excitation wavelength; and - a spectrometer configured to receive a first Raman signal and a second Raman signal, wherein said first Raman signal is associated with said first excitation wavelength and said second Raman signal is associated with said second excitation wavelength, said method comprising: - selecting said first excitation wavelength based on at least one characteristic of a target object, wherein said at least one characteristic is associated with a fluorescence generated by an interaction of the first excitation wavelength with said target object; - determining a fingerprint region of the first Raman signal associated with said first excitation wavelength; the method being characterized by further comprising: - determining a wavelength λ QE at which a quantum efficiency of the spectrometer within the fingerprint region assumes a peak value; - determining a Raman shifted peak of interest v poi for the target object; and - determining said second excitation wavelength λ p 1 based on the peak quantum efficiency value wavelength λ QE and the Raman shifted peak of interest v poi, wherein said second excitation wavelength λp 1 is determined as: λ p 1 = 1 / v poi + 1 / λ QE - a first laser source configured to emit a first excitation wavelength and a second laser source configured to emit a second excitation wavelength; and - a spectrometer configured to receive a first Raman signal and a second Raman signal, wherein said first Raman signal is associated with said first excitation wavelength and said second Raman signal is associated with said second excitation wavelength, said method comprising: - selecting said first excitation wavelength based on at least one characteristic of a target object, wherein said at least one characteristic is associated with a fluorescence generated by an interaction of the first excitation wavelength with said target object; - determining a fingerprint region of the first Raman signal associated with said first excitation wavelength; - selecting said first excitation wavelength based on at least one characteristic of a target object, wherein said at least one characteristic is associated with a fluorescence generated by an interaction of the first excitation wavelength with said target object; - determining a fingerprint region of the first Raman signal associated with said first excitation wavelength; the method being characterized by further comprising: - determining a wavelength λ QE at which a quantum efficiency of the spectrometer within the fingerprint region assumes a peak value; - determining a Raman shifted peak of interest v poi for the target object; and - determining said second excitation wavelength λ p 1 based on the peak quantum efficiency value wavelength λ QE and the Raman shifted peak of interest v poi, wherein said second excitation wavelength λp 1 is determined as: λ p 1 = 1 / v poi + 1 / λ QE - determining a wavelength λ QE at which a quantum efficiency of the spectrometer within the fingerprint region assumes a peak value; - determining a Raman shifted peak of interest v poi for the target object; and - determining said second excitation wavelength λ p 1 based on the peak quantum efficiency value wavelength λ QE and the Raman shifted peak of interest v poi, wherein said second excitation wavelength λp 1 is determined as: λ p 1 = 1 / v poi + 1 / λ QE