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  1. Article ; Online: Short single-frequency self-pulsing Brillouin-Raman distributed feedback fiber laser.

    Bannerman, Rex H S / Smith, Devin H / Gray, Alan C / Gates, James C / Broderick, Neil G R / Gawith, Corin B E / Smith, Peter G R

    Optics express

    2022  Volume 30, Issue 8, Page(s) 12427–12439

    Abstract: We demonstrate that the stimulated Brillouin scattering of a 250 mm long distributed feedback Raman fiber laser can self-pulse with repetition rates up to 7 MHz, pulse widths of 25 ns, and peak powers of 1.2 W. While both CW and pulsed lasing are ... ...

    Abstract We demonstrate that the stimulated Brillouin scattering of a 250 mm long distributed feedback Raman fiber laser can self-pulse with repetition rates up to 7 MHz, pulse widths of 25 ns, and peak powers of 1.2 W. While both CW and pulsed lasing are produced from a bespoke grating at 1119 nm this laser design could be constructed at almost any wavelength, as the Raman and Brillouin gain regions are relative to the pump wavelength. The laser has a low lasing threshold for a Raman laser of 0.55 W, a peak slope efficiency of 14 %, and a maximum average output of 0.25 W. An investigation of beating between pure Raman and Raman-pumped Brillouin lasing shows that the outputs of the two processes are highly correlated and thus the Brillouin lasing is essentially single-frequency when CW and near transform limited for pulsed operation. A phenomenological model of the Raman-Brillouin interaction shows that the pulsing behaviour of such a cavity is expected and produces very similar pulsing to that the seen in experimental results.
    Language English
    Publishing date 2022-04-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.445876
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: High power 739  nm VECSELs for future Yb

    Woods, Jonathan R C / Kahle, Hermann / Gray, Alan C / Daykin, Jake / Tropper, Anne C / Gawith, Corin / Guina, Mircea / Apostolopoulos, Vasilis

    Applied optics

    2021  Volume 60, Issue 3, Page(s) 676–680

    Abstract: We present an operational characterization of a vertical-external-cavity surface-emitting laser emitting around 739 nm with over 150 mW in a single fundamental spatial mode. Results show that the laser is capable of oscillating on a single cavity axial ... ...

    Abstract We present an operational characterization of a vertical-external-cavity surface-emitting laser emitting around 739 nm with over 150 mW in a single fundamental spatial mode. Results show that the laser is capable of oscillating on a single cavity axial mode at 740 nm for up to 22 mW. Tuning of the optical emission is shown to reach 737.3 nm. Furthermore, at best performance, the laser exhibits a slope efficiency of 8.3% and a threshold power of 1.27 W for an output coupler reflectivity of 98%.
    Language English
    Publishing date 2021-03-09
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4522
    ISSN (online) 1539-4522
    DOI 10.1364/AO.409970
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: ZnO indiffused MgO:PPLN ridge waveguides.

    Carpenter, Lewis G / Berry, Sam A / Bannerman, Rex H S / Gray, Alan C / Gawith, Corin B E

    Optics express

    2019  Volume 27, Issue 17, Page(s) 24538–24544

    Abstract: We have demonstrated the first MgO:PPLN ridge waveguides based on ZnO indiffusion and dicing. The fabrication process utilizes ductile regime dicing of a planar waveguide layer producing second harmonic generation (SHG) devices with a near-symmetric ... ...

    Abstract We have demonstrated the first MgO:PPLN ridge waveguides based on ZnO indiffusion and dicing. The fabrication process utilizes ductile regime dicing of a planar waveguide layer producing second harmonic generation (SHG) devices with a near-symmetric sinc
    Language English
    Publishing date 2019-09-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.27.024538
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: CW demonstration of SHG spectral narrowing in a PPLN waveguide generating 2.5 W at 780 nm.

    Carpenter, Lewis G / Berry, Sam A / Gray, Alan C / Gates, James C / Smith, Peter G R / Gawith, Corin B E

    Optics express

    2020  Volume 28, Issue 15, Page(s) 21382–21390

    Abstract: Periodically poled lithium niobate (PPLN) waveguides are a proven and popular means for efficient wavelength conversion. However, conventional PPLN waveguides typically have small mode field diameters (MFD) (≲6 µm) or significant insertion and/or ... ...

    Abstract Periodically poled lithium niobate (PPLN) waveguides are a proven and popular means for efficient wavelength conversion. However, conventional PPLN waveguides typically have small mode field diameters (MFD) (≲6 µm) or significant insertion and/or propagation losses, limiting their ability to operate at multi-watt power levels. In this work we utilise zinc indiffused PPLN ridge waveguides that have a larger MFD, favourable pump/SHG modal overlap, and low insertion losses. Here for the first time, we have demonstrated continuous wave (CW) spectral narrowing from a PPLN waveguide, both with high efficiency and multi-watt second harmonic generation (SHG). 2.5 W of 780 nm has been produced by SHG of an amplified 1560 nm telecom laser with a device efficiency of 58% in a 4.0-cm long ridge waveguide. We have modelled conversion efficiency and applied experimentally measured waveguide parameters to show excellent agreement to the SHG spectra. Spectral narrowing of the full width half maximum (FWHM) of 35.7% has been measured as the nonlinear drive is increased. This work demonstrates that single-pass, multi-watt, CW SHG at 780 nm is feasible from our PPLN waveguide in the large conversion regime.
    Language English
    Publishing date 2020-08-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.395566
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Upconversion detection of 1.25 Gb/s mid-infrared telecommunications using a silicon avalanche photodiode.

    Gray, Alan C / Berry, Sam A / Carpenter, Lewis G / Gates, James C / Gawith, Corin B E / Smith, Peter G R

    Optics express

    2020  Volume 28, Issue 23, Page(s) 34279–34289

    Abstract: With an ever-increasing interest in secure and reliable free-space optical communication, upconversion detectors enabled through nonlinear optical processes are an attractive route to transmitting data as a mid-infrared signal. This spectral region is ... ...

    Abstract With an ever-increasing interest in secure and reliable free-space optical communication, upconversion detectors enabled through nonlinear optical processes are an attractive route to transmitting data as a mid-infrared signal. This spectral region is known to have a higher transmissivity through the atmosphere. In this work, we present an upconversion scheme for detection in the silicon absorption band using magnesium-oxide doped periodically poled lithium niobate to generate 21 mW of a 3.4 µm signal from commercial laser sources using a difference frequency generation process. Following a further nonlinear frequency conversion, via sum-frequency generation, the resulting signal at 809 nm is detected. We achieve >50 µW of signal and bit error rates of 10
    Language English
    Publishing date 2020-11-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.404855
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Evanescent field refractometry in planar optical fiber.

    Holmes, Christopher / Jantzen, Alexander / Gray, Alan C / Gow, Paul C / Carpenter, Lewis G / Bannerman, Rex H S / Gates, James C / Smith, Peter G R

    Optics letters

    2018  Volume 43, Issue 4, Page(s) 791–794

    Abstract: This Letter demonstrates a refractometer in integrated optical fiber, a new optical platform that planarizes fiber using flame hydrolysis deposition (FHD). The unique advantage of the technology is survivability in harsh environments. The platform is ... ...

    Abstract This Letter demonstrates a refractometer in integrated optical fiber, a new optical platform that planarizes fiber using flame hydrolysis deposition (FHD). The unique advantage of the technology is survivability in harsh environments. The platform is mechanically robust, and can survive elevated temperatures approaching 1000°C and exposure to common solvents, including acetone, gasoline, and methanol. For the demonstrated refractometer, fabrication was achieved through wet etching an SMF-28 fiber to a diameter of 8 μm before FHD planarization. An external refractive index was monitored using fiber Bragg gratings (FBGs), written into the core of the planarized fiber. A direct comparison to alternative FBG refractometers is made, for which the developed platform is shown to have comparable sensitivity, with the added advantage of survivability in harsh environments.
    Language English
    Publishing date 2018-02-15
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.43.000791
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Leaky mode integrated optical fibre refractometer.

    Gray, Alan C / Jantzen, Alexander / Gow, Paul C / Smith, Devin H / Gawith, Corin B E / Smith, Peter G R / Holmes, Christopher

    Optics express

    2018  Volume 26, Issue 7, Page(s) 9155–9164

    Abstract: A route to monitor external refractive indices greater than the core index of the waveguide is presented. Initial application utilizes an integrated optical fibre (IOF) platform due to its potential for use in harsh environment sensing. IOF is fabricated ...

    Abstract A route to monitor external refractive indices greater than the core index of the waveguide is presented. Initial application utilizes an integrated optical fibre (IOF) platform due to its potential for use in harsh environment sensing. IOF is fabricated using a bespoke flame hydrolysis deposition process to fuse an optical fibre to a planar substrate achieving an optical quality, ruggedized glass layer between the fibre and substrate was fabricated. The presented refractometer is created by direct UV writing of multiple fibre Bragg gratings into an etched (22 μm diameter) optical fibre post fabrication. Linear regression analysis is applied to quantify propagation loss by monitoring each FBG's back reflected power. The device operates with a sensitivity of approximately 350 dB/cm/RIU at a refractive index of 1.451 at 1550 nm. Numerical simulations using a transfer matrix method are presented and potential routes for development are discussed.
    Language English
    Publishing date 2018-04-02
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.26.009155
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Zinc-indiffused MgO:PPLN waveguides for blue/UV generation via VECSEL pumping.

    Gray, Alan C / Woods, Jonathan R C / Carpenter, Lewis G / Kahle, Hermann / Berry, Sam A / Tropper, Anne C / Guina, Mircea / Apostolopoulos, Vasilis / Smith, Peter G R / Gawith, Corin B E

    Applied optics

    2020  Volume 59, Issue 16, Page(s) 4921–4926

    Abstract: We present the design and characterization of a zinc-indiffused periodically poled lithium-niobate ridge waveguide for second-harmonic generation of ∼ ... ...

    Abstract We present the design and characterization of a zinc-indiffused periodically poled lithium-niobate ridge waveguide for second-harmonic generation of ∼390
    Language English
    Publishing date 2020-06-08
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4522
    ISSN (online) 1539-4522
    DOI 10.1364/AO.387839
    Database MEDical Literature Analysis and Retrieval System OnLINE

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