US 12,132,291 B2
External-cavity laser device, corresponding system and method
Carlo Sias, Sesto Fiorentino (IT); Lucia Duca, Sesto Fiorentino (IT); and Elia Perego, Sesto Fiorentino (IT)
Assigned to LABORATORIO EUROPEO DI SPETTROSCOPIE NON LINEARI (LENS), Sesto Fiorentino (IT); and ISTITUTO NAZIONALE DI RICERCA METROLOGICA (I.N.RI.M.), Turin (IT)
Appl. No. 17/430,231
Filed by LABORATORIO EUROPEO DI SPETTROSCOPIE NON LINEARI (LENS), Sesto Fiorentino (IT); and ISTITUTO NAZIONALE DI RICERCA METROLOGICA (I.N.RI.M.), Turin (IT)
PCT Filed Feb. 11, 2020, PCT No. PCT/IB2020/051055
§ 371(c)(1), (2) Date Aug. 11, 2021,
PCT Pub. No. WO2020/165744, PCT Pub. Date Aug. 20, 2020.
Claims priority of application No. 102019000002013 (IT), filed on Feb. 12, 2019.
Prior Publication US 2022/0131334 A1, Apr. 28, 2022
Int. Cl. H01S 3/1055 (2006.01); H01S 5/02326 (2021.01); H01S 5/024 (2006.01); H01S 5/068 (2006.01); H01S 5/10 (2021.01); H01S 5/14 (2006.01); H01S 5/042 (2006.01)
CPC H01S 3/1055 (2013.01) [H01S 5/02326 (2021.01); H01S 5/02415 (2013.01); H01S 5/02469 (2013.01); H01S 5/068 (2013.01); H01S 5/1039 (2013.01); H01S 5/143 (2013.01); H01S 5/042 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A laser device, comprising:
a source of electromagnetic radiation, configured to generate a light beam that follows an optical path external to said source;
a dispersive stage located outside said source along said optical path of said light beam generated by said source, said dispersive stage comprising at least one axis of reflection that forms an angle with said optical path of said light beam and being configured to reflect:
at least a first spectral portion of said light beam generated by said source towards said source, and
a second spectral portion of said light generated by the source along said axis of reflection,
wherein at least one variable-length external optical cavity is defined between said source of electromagnetic radiation and said dispersive stage;
at least one collimating lens, set along said optical path and configured to collimate said light beam coming from said source; and
a collimator module, in which said source and said at least one collimating lens are mounted; and
an actuator configured to vary a length of said at least one variable-length external optical cavity,
wherein:
said actuator is mechanically coupled to said collimator module; and
said actuator is configured to vary the length of said at least one variable-length external optical cavity via moving said collimator, and
said angle that the at least one axis of reflection of said dispersive stage forms with said optical path of said light beam is constant during a variation of the length of said at least one variable-length external optical cavity via said actuator.