US 12,483,000 B2
T-shaped laser pumping device
François Balembois, Boissy le Sec (FR); and Pierre Pichon, Palaiseau (FR)
Assigned to CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR); INSTITUT OPTIQUE THEORIQUE APPLIQUEE, Palaiseau (FR); and UNIVERSITE PARIS SACLAY, Gif-sur-Yvette (FR)
Appl. No. 17/913,424
Filed by CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR); INSTITUT OPTIQUE THEORIQUE APPLIQUEE, Palaiseau (FR); and Universite Paris-Saclay, Gif-sur-Yvette (FR)
PCT Filed Mar. 23, 2021, PCT No. PCT/EP2021/057467
§ 371(c)(1), (2) Date Sep. 21, 2022,
PCT Pub. No. WO2021/191221, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 2002852 (FR), filed on Mar. 24, 2020; and application No. 2100384 (FR), filed on Jan. 15, 2021.
Prior Publication US 2023/0112416 A1, Apr. 13, 2023
Int. Cl. H01S 3/0933 (2006.01); H01S 3/06 (2006.01); H01S 3/08 (2023.01); H01S 3/16 (2006.01)
CPC H01S 3/0933 (2013.01) [H01S 3/0604 (2013.01); H01S 3/08095 (2013.01); H01S 3/1623 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A laser pumping assembly comprising:
a parallelepipedal solid laser medium (ML) having the shape of a plate in a horizontal plane (xy) and a thickness eL, said laser medium having an absorption spectral band and an associated absorption coefficient α;
at least one light emission module (ME) intended to pump the laser medium, comprising:
a plurality of light-emitting diodes (LED) configured to emit electroluminescent radiation (Ld) at a wavelength λd;
a fluorescent parallelepipedal crystal called a concentrator (CL), having the shape of a plate of thickness ec′, said concentrator having at least one illumination face (SI1, SI2) illuminated by said electroluminescent radiation (Ld) and being configured to absorb said electroluminescent radiation (Ld) and emit fluorescence radiation in a spectral range exhibiting an overlap with said absorption spectral band, said concentrator having an emitting face (SE) having dimensions ec×wc, wc being a width of the concentrator;
said concentrator being in optical contact, via said emitting face (SE), with a receiving face (SR, SR1, SR2) of the laser medium, said concentrator being arranged perpendicular to the laser medium such that the one or more illumination faces (SI1, SI2) are perpendicular to said receiving face so as to perform transverse pumping of said laser medium,
the optical contact being designed such that a portion (Lg) of said fluorescence radiation trapped in the concentrator (CL) by total internal reflection is able to pass into the laser medium (ML) by passing through said emitting face (SE), and be trapped in the laser medium (ML) by total internal reflection,
said thickness eL of the laser medium being such that eL≤Labs/10 where Labs=1/α is an absorption length of the laser medium.