In order to determine the spectral resolution of the instrument, using the same experimental setup presented previously, a white target has been illuminated with lasers at different wavelengths:

• a blue diode laser at 410 nm,

• a green duplicated Nd:YAG laser at 532.4 nm,

• a red He-Ne laser at 633 nm,

• two red diode lasers with nominal wavelength 637.5 nm and 674 nm.