US 11,796,890 B2
Transport system for a laser beam
Fabio Paleari, Milan (IT); Luca Casonato, Malnate (IT); and Marco Tagliaferri, Florence (IT)
Assigned to QUANTA SYSTEM S.P.A., Milan (IT)
Appl. No. 17/290,412
Filed by QUANTA SYSTEM S.P.A., Milan (IT)
PCT Filed Oct. 24, 2019, PCT No. PCT/IB2019/059121
§ 371(c)(1), (2) Date Apr. 30, 2021,
PCT Pub. No. WO2020/089744, PCT Pub. Date May 7, 2020.
Claims priority of application No. 102018000010009 (IT), filed on Nov. 2, 2018.
Prior Publication US 2021/0356840 A1, Nov. 18, 2021
Int. Cl. G02F 1/39 (2006.01); G02B 27/28 (2006.01); G02F 1/35 (2006.01); G02F 1/355 (2006.01); G02F 1/37 (2006.01); H01S 3/00 (2006.01)
CPC G02F 1/39 (2013.01) [G02B 27/286 (2013.01); G02F 1/3503 (2021.01); G02F 1/3553 (2013.01); G02F 1/37 (2013.01); G02F 2203/03 (2013.01); G02F 2203/24 (2013.01); H01S 3/0071 (2013.01); H01S 3/0092 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A wavelength conversion system comprising a transport system for a laser beam comprising:
a first lambda quarter-wave plate adapted to convert a polarization of linear beam from linear polarization laser generator at 532 nm to a circular polarization laser beam;
an articulated arm comprising a mirror at each of its joints, arranged at 45° with respect to said laser beam;
each of said mirrors having a phase shift between the reflected components of less than 10°;
a second lambda quarter-wave plate for converting said laser beam from circular polarization to linear polarization and providing a linear polarization output laser beam;
a non-linear converter for converting the wavelength of said output laser beam from a first wavelength to a second wavelength;
wherein the non-linear converter is a parametric oscillator with a KTP crystal, and wherein the KTP crystal is rotatable so as to cause adjustment of the wavelength of the output laser beam;
wherein the KTP crystal has a length between 10 and 30 mm and includes an aperture, cut to obtain type 1 phase matching at angles of θ=54.5° and φ=0° to generate a signal at 755 nm and an idler at 1801 nm.