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Single-mode laser operation of CdSe/CdS Core/Shell colloidal quantum rods on silica microspheres

Single-mode laser operation of CdSe/CdS Core/Shell colloidal quantum rods on silica microspheres
Single-mode laser operation of CdSe/CdS Core/Shell colloidal quantum rods on silica microspheres
Single-mode operation of fiber-coupled hybrid lasers based on colloidal CdSe/CdS core/shell nanorods in silica microspheres is reported. The spheres were pumped at a wavelength around 400 nm with a tunable frequency doubled Ti:sapphire amplifier, operating at 250 KHz and emitting 180 fs-short pulses with a linewidth of 5 nm. Pump pulses were evanescently coupled into the spheres with adiabatic tapers made of single-moded fibers at 405 nm. Laser signals were collected by either a fiber tip with a diameter of ~50 nm or, the same taper used for pumping. To optimize pump efficiencies, phase-matching of the propagation coefficients between the propagating mode in the taper and the fundamental whispering-gallery-mode (WGM) in the microsphere was established.
Single-WGM operation at ~628 nm, corresponding to the 1Sh-1Se(CdSe) transition of a microsphere with a 9.2 µm diameter was obtained by resonant pumping a fundamental WG pump mode at the equatorial ring of the sphere with |m| = l, where m and l are the angular momentum and the azimuthal numbers, above an absorbed pump power threshold of 67.5 µW. Microspheres with larger diameters produced multimode laser emission. A maximum output power of 5.5 µW for 155 µW of absorbed power was measured, corresponding to a slope efficiency of 6.4%.
Wavelength tunability over a range of 2.1 nm (which corresponds to 30% of the FSR) was achieved for the lasing wavelength, by heating with 3.5 µm-pulses of 200 fs duration and 80 MHz repetition rate.
Grivas, C.
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Andreakou, P.
8b2313ab-4015-4cd7-8df3-eef6275453f4
Wang, Pengfei
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Ding, Ming
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Brambilla, G.
815d9712-62c7-47d1-8860-9451a363a6c8
Manna, L.
5a5e3427-4703-41e2-97c1-bddbd186ffe4
Lagoudakis, P.G.
ea50c228-f006-4edf-8459-60015d961bbf
Grivas, C.
7f564818-0ac0-4127-82a7-22e87ac35f1a
Andreakou, P.
8b2313ab-4015-4cd7-8df3-eef6275453f4
Wang, Pengfei
a1ba240f-d4f0-4150-bcd8-cb418e841dcb
Ding, Ming
086b25a3-e5c3-4501-a90d-43d734e19344
Brambilla, G.
815d9712-62c7-47d1-8860-9451a363a6c8
Manna, L.
5a5e3427-4703-41e2-97c1-bddbd186ffe4
Lagoudakis, P.G.
ea50c228-f006-4edf-8459-60015d961bbf

Grivas, C., Andreakou, P., Wang, Pengfei, Ding, Ming, Brambilla, G., Manna, L. and Lagoudakis, P.G. (2012) Single-mode laser operation of CdSe/CdS Core/Shell colloidal quantum rods on silica microspheres. E-MRS '12 Materials Research Society Spring Meeting, Strasbourg, France. 13 - 17 May 2012.

Record type: Conference or Workshop Item (Paper)

Abstract

Single-mode operation of fiber-coupled hybrid lasers based on colloidal CdSe/CdS core/shell nanorods in silica microspheres is reported. The spheres were pumped at a wavelength around 400 nm with a tunable frequency doubled Ti:sapphire amplifier, operating at 250 KHz and emitting 180 fs-short pulses with a linewidth of 5 nm. Pump pulses were evanescently coupled into the spheres with adiabatic tapers made of single-moded fibers at 405 nm. Laser signals were collected by either a fiber tip with a diameter of ~50 nm or, the same taper used for pumping. To optimize pump efficiencies, phase-matching of the propagation coefficients between the propagating mode in the taper and the fundamental whispering-gallery-mode (WGM) in the microsphere was established.
Single-WGM operation at ~628 nm, corresponding to the 1Sh-1Se(CdSe) transition of a microsphere with a 9.2 µm diameter was obtained by resonant pumping a fundamental WG pump mode at the equatorial ring of the sphere with |m| = l, where m and l are the angular momentum and the azimuthal numbers, above an absorbed pump power threshold of 67.5 µW. Microspheres with larger diameters produced multimode laser emission. A maximum output power of 5.5 µW for 155 µW of absorbed power was measured, corresponding to a slope efficiency of 6.4%.
Wavelength tunability over a range of 2.1 nm (which corresponds to 30% of the FSR) was achieved for the lasing wavelength, by heating with 3.5 µm-pulses of 200 fs duration and 80 MHz repetition rate.

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e-pub ahead of print date: 2012
Venue - Dates: E-MRS '12 Materials Research Society Spring Meeting, Strasbourg, France, 2012-05-13 - 2012-05-17
Organisations: Optoelectronics Research Centre, Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 368449
URI: http://eprints.soton.ac.uk/id/eprint/368449
PURE UUID: 767fd277-df5e-4d3d-b61c-1273f0d0d873

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Date deposited: 18 Sep 2014 09:29
Last modified: 10 Apr 2020 16:37

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Contributors

Author: C. Grivas
Author: P. Andreakou
Author: Pengfei Wang
Author: Ming Ding
Author: G. Brambilla
Author: L. Manna
Author: P.G. Lagoudakis

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