	US 11,719,993 B2
	High power laser converter based on patterned SRB4B07 or PBB407 crystal
Valentin Gapontsev, Oxford, MA (US); Aleksander Cherepakhin, Oxford, MA (US); Anatolii Zamkov, Oxford, MA (US); Nikolay Evtikhiev, Oxford, MA (US); Dan Perlov, Oxford, MA (US); Aleksander Zaytsev, Oxford, MA (US); Andrey Sadovskiy, Oxford, MA (US); and Nikita Radionov, Oxford, MA (US)
Assigned to IPG PHOTONICS CORPORATION, Marlborough, MA (US)
Appl. No. 17/415,090
Filed by IPG PHOTONICS CORPORATION, Oxford, MA (US)
PCT Filed Dec. 18, 2019, PCT No. PCT/US2019/067135 § 371(c)(1), (2) Date Jun. 17, 2021, PCT Pub. No. WO2020/132043, PCT Pub. Date Jun. 25, 2020.
Claims priority of provisional application 62/781,386, filed on Dec. 18, 2018.
Prior Publication US 2022/0066283 A1, Mar. 3, 2022
Int. Cl. G02F 1/355 (2006.01); G02F 1/37 (2006.01); G02F 1/39 (2006.01); H01S 3/00 (2006.01); H01S 3/11 (2023.01); H01S 3/23 (2006.01); G02F 1/35 (2006.01); G02F 1/377 (2006.01); H01S 3/109 (2006.01)

CPC G02F 1/3551 (2013.01) [G02F 1/3501 (2013.01); G02F 1/353 (2013.01); G02F 1/354 (2021.01); G02F 1/355 (2013.01); G02F 1/3558 (2013.01); G02F 1/37 (2013.01); G02F 1/3775 (2013.01); G02F 1/39 (2013.01); H01S 3/0092 (2013.01); H01S 3/109 (2013.01); H01S 3/11 (2013.01); H01S 3/2308 (2013.01)]

11 Claims

1. A laser system, comprising:

a laser source outputting light at a fundamental frequency; and

a frequency converter operative to convert the fundamental frequency into a higher harmonic and including at least one frequency converting stage which is based on a Strontium Tetraborate SrB₄O₇(SBO) or Lead Tetraborate PbB₄O₇(PBO) crystal, wherein the SBO/PBO crystal is configured with a plurality of uniform domains with defining a periodic structure an having respective periodically alternating polarities of the crystal axis so as to enable quasi-phase-matching (QPM).