Optical instrument and method for determining a wavelength of light generated by a light source, and optical system comprising the optical instrument

An optical instrument for determining a wavelength of light generated by a light source, comprising

• a signal generator for generating a driving signal,
• a tunable optical filter device configured to receive the driving signal, the tunable optical filter device configured to diffract the light generated by the light source based on the driving signal,
• an optical detector device configured to detect intensity as a degree of diffraction of the light diffracted by the tunable optical filter device, and
• an analyzer configured to determine the wavelength of the light based on the timing of the diffraction;
• wherein
• the signal generator is configured to generate a trigger signal;
• the signal generator generates a plurality of identical driving signals one after another for measuring the wavelengths of the light source at various points of time;
• and
• the signal generator generates a first driving signal of the plurality of driving signals after the generation of the trigger signal by a predetermined time lag.