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Optical microstub resonator lasers

Optical microstub resonator lasers
Optical microstub resonator lasers
We describe the fabrication and optical performance of a new passive and active optical microstub resonator (MSR). The technique is extremely simple and enables the fabrication of high quality resonators. They are primarily cylindrical cavities (“stubs”) 10's of microns long spliced to two fiber stems of smaller diameter on either side. The splicing makes the edges of the “stub” rounded and smooth, improving the optical performance. The fabricated MSRs had typical stem/cavity diameters of 125µm/200µm, respectively, and 50-200µm lengths. Strong resonances with coupling efficiencies and Q factors > 15dB and 106, respectively, were demonstrated.
Using a special Ytterbium doped fiber with doped core diameter of 220µm and cladding diameter of 240µm, we formed active MSRs with 50-500µm lengths and 125µm stem diameters. The active MSRs were side pumped by 980nm single-mode diodes through their stems. Residual pump and generated signal were monitored at the opposite fiber stem end. Strong lasing peaks in the 1060nm wavelength range were observed. No transversely scattered signal/pump light was detected. This indicates that the whispering-gallery modes were formed at the inner doped core/cladding interface. In stark contrast with previous microlaser demonstrations, this laser does not need additional microtapers/waveguides for launching or collecting light. This is the first demonstration of a robust, fully integrated, stand-alone microresonator laser where pump launching and signal collection is achieved by the fiber stems, used to form the microcavity. This is a major advancement and will impact significantly the development of future advanced sensor applications.
Murugan, G.S.
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Bakhtiari Gorajoobi, S.
ba37e5f9-6a5e-4beb-82eb-b932613fba55
Codemard, C.A.
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Mohd Nasir, M.N.
f44744b8-8eb9-4051-b871-0eabda932d37
Chen, G.Y.
b766d3f7-a6dc-4c15-8f00-17ad044348c1
Langner, A.
aad73098-4d0f-4ad4-a041-35d5a4e440c6
Zervas, M.N.
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Murugan, G.S.
a867686e-0535-46cc-ad85-c2342086b25b
Bakhtiari Gorajoobi, S.
ba37e5f9-6a5e-4beb-82eb-b932613fba55
Codemard, C.A.
3aa50483-b61c-4e7e-b178-c9a88bb47bef
Mohd Nasir, M.N.
f44744b8-8eb9-4051-b871-0eabda932d37
Chen, G.Y.
b766d3f7-a6dc-4c15-8f00-17ad044348c1
Langner, A.
aad73098-4d0f-4ad4-a041-35d5a4e440c6
Zervas, M.N.
1840a474-dd50-4a55-ab74-6f086aa3f701

Murugan, G.S., Bakhtiari Gorajoobi, S., Codemard, C.A., Mohd Nasir, M.N., Chen, G.Y., Langner, A. and Zervas, M.N. (2014) Optical microstub resonator lasers. Photonics West 2014, United States. 01 - 06 Feb 2014. (doi:10.1117/12.2039672).

Record type: Conference or Workshop Item (Paper)

Abstract

We describe the fabrication and optical performance of a new passive and active optical microstub resonator (MSR). The technique is extremely simple and enables the fabrication of high quality resonators. They are primarily cylindrical cavities (“stubs”) 10's of microns long spliced to two fiber stems of smaller diameter on either side. The splicing makes the edges of the “stub” rounded and smooth, improving the optical performance. The fabricated MSRs had typical stem/cavity diameters of 125µm/200µm, respectively, and 50-200µm lengths. Strong resonances with coupling efficiencies and Q factors > 15dB and 106, respectively, were demonstrated.
Using a special Ytterbium doped fiber with doped core diameter of 220µm and cladding diameter of 240µm, we formed active MSRs with 50-500µm lengths and 125µm stem diameters. The active MSRs were side pumped by 980nm single-mode diodes through their stems. Residual pump and generated signal were monitored at the opposite fiber stem end. Strong lasing peaks in the 1060nm wavelength range were observed. No transversely scattered signal/pump light was detected. This indicates that the whispering-gallery modes were formed at the inner doped core/cladding interface. In stark contrast with previous microlaser demonstrations, this laser does not need additional microtapers/waveguides for launching or collecting light. This is the first demonstration of a robust, fully integrated, stand-alone microresonator laser where pump launching and signal collection is achieved by the fiber stems, used to form the microcavity. This is a major advancement and will impact significantly the development of future advanced sensor applications.

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More information

e-pub ahead of print date: 2014
Venue - Dates: Photonics West 2014, United States, 2014-02-01 - 2014-02-06
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 363176
URI: http://eprints.soton.ac.uk/id/eprint/363176
PURE UUID: 76d100ab-b207-4726-872a-79cfde32e224
ORCID for G.S. Murugan: ORCID iD orcid.org/0000-0002-2733-3273
ORCID for M.N. Zervas: ORCID iD orcid.org/0000-0002-0651-4059

Catalogue record

Date deposited: 20 Mar 2014 16:39
Last modified: 18 Feb 2021 17:05

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Contributors

Author: G.S. Murugan ORCID iD
Author: C.A. Codemard
Author: M.N. Mohd Nasir
Author: G.Y. Chen
Author: A. Langner
Author: M.N. Zervas ORCID iD

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