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US 12,700,709 B2Granted
Mode-locked resonator and ultrashort pulse laser comprising the same
AssigneeKorea Institute of Science and Technology
InventorsYong-Won Song, Hyowon Moon, Oleksiy Kovalchuk, Sungjae Lee
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Abstract
Disclosed are a mode-locked resonator according to an embodiment and an ultrashort pulse laser comprising the mode-locked resonator. The mode-locked resonator according to an embodiment includes a resonator including a shape of a sphere; and a saturable absorber coated on a surface of the resonator, wherein the resonator is coupled with some photons traveling in a tapered optical fiber disposed near the mode-locked resonator and interacts with the saturable absorber based on a Whispering Gallery Mode (WGM).
Claims12
A mode-locked resonator 10, comprising:
- a resonator 11 including a shape of a sphere;
- and
- a saturable absorber 12 coated on a surface of the resonator 11,
- wherein the resonator 11 is coupled with some photons traveling in a tapered optical fiber 21 disposed near the resonator 11 and interacts with the saturable absorber 12 based on a Whispering Gallery Mode (WGM),
- wherein the mode-locked resonator 10 determines a pulse repetition rate of an ultrashort pulse laser beam output from the mode-locked resonator 10 based on a diameter of the sphere, wherein the shape of the sphere includes a shape of a microsphere produced by an electric arc, wherein a diameter of the microsphere is determined based on a diameter of a raw optical fiber to which the electric arc is applied, and
- wherein the tapered optical fiber 21 injects pump light to compensate for a change in an effective refractive index of the mode-locked resonator caused by a photothermal effect of the saturable absorber 12.
3 more elements
Dependencies are inferred from the claim text.