	US 11,948,548 B2
	Phonon parametric oscillator
Arnaud Devos, Ennetieres en Weppes (FR)
Assigned to CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR); JUNIA, Lille (FR); UNIVERSITE DE LILLE, Lille (FR); and CENTRALE LILLE INSTITUT, Villeneuve-d'Ascq (FR)
Appl. No. 16/969,054
Filed by CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR); UNIVERSITE DE LILLE, Lille (FR); and YNCREA HAUTS DE FRANCE ISEN LILLE, Lille (FR)
PCT Filed Feb. 8, 2019, PCT No. PCT/EP2019/053094 § 371(c)(1), (2) Date Aug. 11, 2020, PCT Pub. No. WO2019/154967, PCT Pub. Date Aug. 15, 2019.
Claims priority of application No. 1851155 (FR), filed on Feb. 12, 2018.
Prior Publication US 2021/0035549 A1, Feb. 4, 2021
Int. Cl. G10K 15/04 (2006.01)

CPC G10K 15/046 (2013.01)

15 Claims

1. A phonon parametric oscillator comprising a laser for periodically emitting brief optical pulses (IL), an assembly for generating acoustic pulses (IA) and a medium for coupling the acoustic pulses to an object (O), the assembly for generating acoustic pulses comprising an entrance face, an exit face, a conversion medium for converting the brief optical pulses into acoustic pulses and a propagation medium for propagating said acoustic pulses, the entrance and exit faces being reflective to the acoustic pulses, the propagation medium having a defined thickness, the exit face making contact with the coupling medium, wherein the round-trip time of an acoustic pulse due to reflection from the entrance and exit faces is equal to the emission period (τ) of the laser, so that the reflected acoustic pulse is in phase with the following acoustic pulse.