Fiber-coupled microsphere laser
First Claim
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1. A device, comprising:
- a resonator formed of a laser gain medium in a shape of at least a portion of a sphere that includes an equator of said sphere, said laser gain medium operable to absorb light at a pump wavelength and to emit light at a laser wavelength, said resonator configured to support whispering gallery modes at both said pump wavelength and said laser wavelength; and
an optical fiber configured to guide light at both said pump wavelength and said laser wavelength and to include an angle-polished facet that forms an angle with respect to said fiber, wherein said angle-polished facet positioned near said resonator to evanescently couple pump light at said pump wavelength in said optical fiber into a whispering gallery mode at said pump wavelength and to evanescently couple light in a whispering gallery mode at said laser wavelength into said optical fiber.
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Abstract
A fiber-coupled laser based on a whispering-gallery-mode resonator formed of a laser gain medium and an angle-polished fiber coupler.
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Citations
15 Claims
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1. A device, comprising:
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a resonator formed of a laser gain medium in a shape of at least a portion of a sphere that includes an equator of said sphere, said laser gain medium operable to absorb light at a pump wavelength and to emit light at a laser wavelength, said resonator configured to support whispering gallery modes at both said pump wavelength and said laser wavelength; and
an optical fiber configured to guide light at both said pump wavelength and said laser wavelength and to include an angle-polished facet that forms an angle with respect to said fiber, wherein said angle-polished facet positioned near said resonator to evanescently couple pump light at said pump wavelength in said optical fiber into a whispering gallery mode at said pump wavelength and to evanescently couple light in a whispering gallery mode at said laser wavelength into said optical fiber. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method, comprising:
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using an angle-polished fiber coupler to evanescently couple a pump beam from a guided pump mode in said fiber coupler into a pump whispering gallery mode in a resonator formed from at least a portion of a sphere and of a laser gain medium that absorbs light at said pump beam to emit light at a laser wavelength;
maintaining said pump beam above a threshold level to generate a laser oscillation at said laser wavelength in said resonator in a laser whispering gallery mode that spatially overlaps with said pump beam in said pump whispering gallery mode; and
coupling laser energy in said laser whispering gallery mode out of said resonator via an evanescent field into said angle-polished fiber coupler to produce an output laser beam. - View Dependent Claims (8, 9, 10)
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11. A device, comprising:
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a resonator formed of a dielectric medium in a shape of at least a portion of a sphere that includes an equator of said sphere, said dielectric medium and doped with active ions to absorb light at a pump wavelength and to emit light at a laser wavelength, said resonator configured to support whispering gallery modes at both said pump wavelength and said laser wavelength;
means for selecting a whispering gallery mode at said laser wavelength in a single selected direction for amplification while suppressing a whispering gallery mode at said laser wavelength in a direction opposite to said single selected direction; and
an optical fiber configured to guide light at both said pump wavelength and said laser wavelength and to include an angle-polished facet that forms an angle with respect to said fiber, wherein said angle-polished facet positioned near said resonator to evanescently couple pump light at said pump wavelength in said optical fiber into a whispering gallery mode at said pump wavelength and to evanescently couple light in said whispering gallery mode at said laser wavelength in said selected single direction into said optical fiber. - View Dependent Claims (12, 13, 14, 15)
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Specification