Designing silicon-core fiber tapers for efficient mid-IR supercontinuum generation
Designing silicon-core fiber tapers for efficient mid-IR supercontinuum generation
We propose a taper design for a silicon-core fiber for the purpose of
generating a supercontinuum (SC) from a 2.1μm pulsed fiber laser. The
design is tailored to maximise the conversion efficiency (CE) to the
3-4μm region, which is important for environmental sensing as it
includes several key greenhouse gas absorption lines.
There is a need for compact, low-power and efficient solutions.
Aluminium nitride photonic-chip waveguides have been shown to generate
0.3mW in the 3-4μm region with an 80mW input. Although this is
sufficient power for some applications, the system only offers a 0.4%
CE. More recently a silicon nitride planar waveguide was used to
transfer energy from a commercial 2.1μm femtosecond laser to targeted
wavelengths in the 3-4μm region through dispersive wave generation. To
cover the entire region, it is estimated that an input of 40mW would be
needed to generate ~1mW (CE of 2.5%).
Compared to these materials silicon has a higher nonlinearity and,
despite multi-photon absorption, is highly efficient at transferring
energy to different wavelengths with modest input powers. Moreover,
silicon-core fibers can be tapered using established post-processing
procedures, which can be used to control the phase-matching conditions
to concentrate energy in a required wavelength range.
We have designed a silicon-core fiber taper that can take the input from
a 2.1μm fiber laser and efficiently transfer the energy to cover the
entire 3-4μm range.
We simulated SC generation using the generalised nonlinear Schrödinger
equation including wavelength-dependent loss terms (linear, TPA and
3PA). From these simulations we estimate that ~0.8mW average power can
be generated covering the entire 3-4μm region, with only 15mW input
power, a CE of 5%.
Campling, Joseph
daeaf1d9-ff3c-4efd-a618-3a248b79e7f5
Peacock, Anna
685d924c-ef6b-401b-a0bd-acf1f8e758fc
Horak, Peter
520489b5-ccc7-4d29-bb30-c1e36436ea03
6 April 2020
Campling, Joseph
daeaf1d9-ff3c-4efd-a618-3a248b79e7f5
Peacock, Anna
685d924c-ef6b-401b-a0bd-acf1f8e758fc
Horak, Peter
520489b5-ccc7-4d29-bb30-c1e36436ea03
Campling, Joseph, Peacock, Anna and Horak, Peter
(2020)
Designing silicon-core fiber tapers for efficient mid-IR supercontinuum generation.
In Nonliner Optics and it's Applications 2020.
vol. 11358,
SPIE..
(doi:10.1117/12.2555810).
Record type:
Conference or Workshop Item
(Paper)
Abstract
We propose a taper design for a silicon-core fiber for the purpose of
generating a supercontinuum (SC) from a 2.1μm pulsed fiber laser. The
design is tailored to maximise the conversion efficiency (CE) to the
3-4μm region, which is important for environmental sensing as it
includes several key greenhouse gas absorption lines.
There is a need for compact, low-power and efficient solutions.
Aluminium nitride photonic-chip waveguides have been shown to generate
0.3mW in the 3-4μm region with an 80mW input. Although this is
sufficient power for some applications, the system only offers a 0.4%
CE. More recently a silicon nitride planar waveguide was used to
transfer energy from a commercial 2.1μm femtosecond laser to targeted
wavelengths in the 3-4μm region through dispersive wave generation. To
cover the entire region, it is estimated that an input of 40mW would be
needed to generate ~1mW (CE of 2.5%).
Compared to these materials silicon has a higher nonlinearity and,
despite multi-photon absorption, is highly efficient at transferring
energy to different wavelengths with modest input powers. Moreover,
silicon-core fibers can be tapered using established post-processing
procedures, which can be used to control the phase-matching conditions
to concentrate energy in a required wavelength range.
We have designed a silicon-core fiber taper that can take the input from
a 2.1μm fiber laser and efficiently transfer the energy to cover the
entire 3-4μm range.
We simulated SC generation using the generalised nonlinear Schrödinger
equation including wavelength-dependent loss terms (linear, TPA and
3PA). From these simulations we estimate that ~0.8mW average power can
be generated covering the entire 3-4μm region, with only 15mW input
power, a CE of 5%.
Text
2003 SPIE-Photonics-EU_si-fibre-taper_for_midIR_JCampling
- Accepted Manuscript
More information
Published date: 6 April 2020
Venue - Dates:
SPIE Photonics Europe 2020, , Strasbourg, France, 2020-03-29 - 2020-04-02
Identifiers
Local EPrints ID: 439348
URI: http://eprints.soton.ac.uk/id/eprint/439348
PURE UUID: 4de71ea9-748a-4606-b84c-80132730b6df
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Date deposited: 17 Apr 2020 16:30
Last modified: 17 Mar 2024 02:56
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Contributors
Author:
Joseph Campling
Author:
Anna Peacock
Author:
Peter Horak
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