US 11,936,157 B2
Laser device
Daniel Popa, Cambridge (GB); Giulio Cerullo, Milan (IT); Tullio Scopigno, Genoa (IT); Dario Polli, Milan (IT); and Andrea Ferrari, Cambridge (GB)
Assigned to CAMBRIDGE ENTERPRISE LIMITED, Cambridge (GB); POLITECNICO DI MILANO, Milan (IT); and FONDAZIONE INSTITUTO ITALIANO DI TECNOLOGIA, Genoa (IT)
Appl. No. 16/612,613
Filed by Cambridge Enterprise Limited, Cambridge (GB); Politecnico Di Milano, Milan (IT); and Fondazione Istituto Italiano Di Tecnologia, Genoa (IT)
PCT Filed May 11, 2018, PCT No. PCT/GB2018/051283
§ 371(c)(1), (2) Date Nov. 11, 2019,
PCT Pub. No. WO2018/206980, PCT Pub. Date Nov. 15, 2018.
Claims priority of application No. 102017000051935 (IT), filed on May 12, 2017.
Prior Publication US 2020/0203911 A1, Jun. 25, 2020
Int. Cl. H01S 3/067 (2006.01); G01N 21/65 (2006.01); H01S 3/082 (2006.01); H01S 3/105 (2006.01); H01S 3/1118 (2023.01); H01S 3/16 (2006.01); H01S 3/23 (2006.01)
CPC H01S 3/06791 (2013.01) [G01N 21/65 (2013.01); H01S 3/082 (2013.01); H01S 3/105 (2013.01); H01S 3/1118 (2013.01); H01S 3/1608 (2013.01); H01S 3/1618 (2013.01); H01S 3/2391 (2013.01); G01N 2021/653 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A laser device for outputting filtered light pulses for inducing coherent Raman scattering in a sample, the laser device comprising:
a first optical cavity comprising a first gain medium;
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;
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 pulses at a first optical outlet of the first optical cavity and at a second optical outlet of the second optical cavity,
wherein at least one of the first optical outlet and the second optical outlet are, respectively, coupled to an optical isolator to directionally output the respectively output filtered pico-second light pulses;
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 at least one of the first optical filter or second optical filter is a tunable optical filter and configured to vary the first predetermined range of wavelengths or the second predetermined range of wavelengths respectively,
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.