Patent ID: 8446580

Claim:
A system for generating optical signals for Raman vibrational analysis of an external specimen, the system comprising: a laser source capable of emitting at least one femtosecond fundamental optical pulse in a first band of fundamental frequencies comprising at least one first (ω f1 ) and one second (ω f2 ) fundamental frequencies; a second-harmonic generating system comprising at least one nonlinear optical crystal capable of converting said at least one fundamental optical pulse into at least two second-harmonic optical pulses having a narrower band with respect to the bandwidth of the at least one fundamental pulse, a first second-harmonic pulse at a first second-harmonic frequency (ω p ) of the first fundamental frequency (ω f1 ) and a second second-harmonic pulse at a second second-harmonic frequency (ω s ) of the second fundamental frequency (ω f2 ), said second second-harmonic frequency being different from the first second-harmonic frequency, and a Raman vibrational analysis apparatus capable of receiving said first and second second-harmonic pulses and of directing them toward said specimen.