OPTICAL EXCITATION DEVICE FOR GENERATING STIMULATED RAMAN PROCESSES, RAMAN STIMULATED PROCESS MEASUREMENT ASSEMBLY, AND OPTICAL EXCITATION METHOD FOR GENERATING STIMULATED RAMAN PROCESSES

摘要

An optical excitation device (20) for generating stimulated Raman processes, said optical device (20) for receiving the laser beam (11) of a pulsed laser source (10). The optical device (20) has an optical splitter for separating the laser beam on a first and a second path (210, 220). The first channel (210) comprises a first optical fiber (211) and a frequency pre-drift system adapted to apply a first frequency time drift. The optical device (20) further comprises a second optical fiber (233) arranged to recover first and second sub-beams (21, 22) at the output of the first and second channels (210, 220) and to apply them a second time frequency drift, the second optical fiber (233) and the frequency pre-drift system being configured so that the first and second sub-beams (21, 22) have the same frequency drift. The invention further relates to a measurement system and an excitation method.