Patent ID: 11936157
Assignee: CAMBRIDGE ENTERPRISE LIMITED
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 14:
15. A laser device for outputting filtered pico-second light pulses for inducing coherent Raman scattering in a sample, the laser device comprising:
a first optical cavity comprising a first gain medium; and
a second optical cavity comprising a second gain medium different than the first gain medium,
wherein the first gain medium and the second gain medium are each excitable by a pump light source to generate light at respective different ranges of wavelengths;

a synchronizer optically coupled to both the first optical cavity and the second optical cavity, wherein the synchronizer is configured to synchronize and mode-lock light from the first optical cavity and the second optical cavity; and
a first optical filter and a second optical filter, wherein the first optical filter and the second optical filter are configured to:
filter the light from the first optical cavity and the second optical cavity, respectively, in order to output first filtered pico-second light pulses at a first predetermined range of wavelengths and second filtered pico-second light pulses at a second predetermined range of wavelengths, and
respectively output the filtered pico-second light pulse at a first optical outlet of the first optical cavity and at a second optical outlet of the second optical cavity,
wherein the first optical filter and the second optical filter are positioned externally to the first optical cavity and second optical cavity, respectively; and

a first fiber amplifier doped with the first gain medium at the first optical outlet and a second fiber amplifier doped with the second gain medium at the second optical outlet to amplify the light,
wherein the synchronizer comprises a saturable absorber and is configured to carry out synchronization and passive mode locking of the pico-second light pulses from the first optical cavity and the second optical cavity,
wherein the laser device is integrated in an optical device that comprises:
two collimators configured to collimate the filtered pico-second light pulses, and
two dichroic mirrors configured to combine the collimated pico-second light pulses from both of the two collimators.