Imperial College London

Dr Robbie Murray

Faculty of Natural SciencesDepartment of Physics

Imperial College Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 9672robert.murray10

 
 
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Location

 

636CBlackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

25 results found

Chandran AM, Runcorn TH, Murray RT, Taylor JRet al., 2019, 620 nm source by second harmonic generation of a phosphosilicate Raman fiber amplifier

© 2019 The Author(s) We demonstrate a nanosecond-pulsed 620 nm source through frequency doubling a 1240 nm phosphosilicate Raman fiber amplifier. The source emits up to 213 mW of average power, and is repetition rate and pulse duration tunable.

Conference paper

Runcorn TH, Murray RT, Kelleher EJR, Popov SV, Taylor JRet al., 2019, Watt-level, Duration-tunable Picosecond Source at 560 nm by Second-harmonic Generation of a Raman Fiber Laser

Conference paper

Gorlitz F, Guldbrand S, Runcorn T, Murray R, Jaso-Tamame A, Sinclair H, Martinez-Perez E, Taylor J, Neil M, Dunsby CW, French Pet al., 2018, easySLM-STED: stimulated emission depletion microscopy with aberration correction, extended field of view and multiple beam scanning, Journal of Biophotonics, ISSN: 1864-063X

We demonstrate a simplified set‐up for STED microscopy with a straightforward alignment procedure that uses a single spatial light modulator (SLM) with collinear incident excitation and depletion beams to provide phase modulation of the beam profiles and correction of optical aberrations. We show that this approach can be used to extend the field of view for STED microscopy by correcting chromatic aberration that otherwise leads to walk‐off between the focused excitation and depletion beams. We further show how this arrangement can be adapted to increase the imaging speed through multibeam excitation and depletion. Fine adjustments to the alignment can be accomplished using the SLM only, conferring the potential for automation.

Journal article

Runcorn TH, Murray R, Taylor JR, 2018, Highly efficient nanosecond 560 nm source by SHG of a combined Yb-Raman fiber amplifier, Optics Express, Vol: 26, Pages: 4440-4447, ISSN: 1094-4087

We demonstrate a nanosecond 560 nm pulse source based on frequency-doubling the output of a combined Yb-Raman fiber amplifier, achieving a pulse energy of 2.0 µJ with a conversion efficiency of 32% from the 976 nm pump light. By introducing a continuous-wave 1120 nm signal before the cladding pumped amplifier of a pulsed Yb:fiber master oscillator power amplifier system operating at 1064 nm, efficient conversion to 1120 nm occurs within the fiber amplifier due to stimulated Raman scattering. The output of the combined Yb-Raman amplifier is frequency-doubled to 560 nm using a periodically poled lithium tantalate crystal with a conversion efficiency of 47%, resulting in an average power of 3.0 W at a repetition rate of 1.5 MHz. The 560 nm pulse duration of 1.7 ns and the near diffraction-limited beam quality (M2≤1.18) make this source ideally suited to biomedical imaging applications such as optical-resolution photoacoustic microscopy and stimulated emission depletion microscopy.

Journal article

Murray RT, Runcorn TH, Taylor JR, 2018, Fibre-based sources from the UV to mid-infrared

© 2018 The Author(s). Extensive spectral and temporal versatility are achieved through the integration of nonlinear fibres and crystals with seeded master-oscillator power fibre amplifier configurations through diverse generation processes. Various schemes will be reviewed.

Conference paper

Runcorn TH, Gorlitz F, Murray RT, Kelleheret al., 2017, Visible Raman-shifted Fiber Lasers for Biophotonic Applications, IEEE Journal of Selected Topics in Quantum Electronics, Vol: 24, ISSN: 1077-260X

The efficient nonlinear conversion of Yb-doped fiber laser systems using a combination of stimulated Raman scattering and second-harmonic generation is an effective method for developing sources for biophotonic applications in the yellow-green spectral region. In this paper, we review recent progress in the development of these sources, compare the relative benefits of differing source architectures and demonstrate STED microscopy using an exemplar source.

Journal article

Runcorn TH, Murray RT, Taylor JR, 2017, High Average Power Second-harmonic Generation of a CW Erbium Fiber MOPA, IEEE Photonics Technology Letters, Vol: 29, Pages: 1576-1579, ISSN: 1041-1135

We report the generation of 28 W of 780 nm radiation with near diffraction limited beam quality (M²≤1.15) by frequency-doubling a continuous-wave (CW) erbium fiber master oscillator power amplifier (MOPA) system in a periodically poled lithium niobate crystal. The second-harmonic generation conversion efficiency reached 45% with no roll-off observed, suggesting that further power scaling should be possible with higher fundamental pump powers. The generated second-harmonic had a 3 dB spectral bandwidth of 0.10 nm. The presented architecture represents a simple and effective route to generating high-brightness radiation around 780 nm.

Journal article

Murray RT, Runcorn TH, Guha S, Taylor JRet al., 2017, High average power parametric wavelength conversion at 3.31–3.48 μm in MgO:PPLN, Optics Express, Vol: 25, Pages: 6421-6430, ISSN: 1094-4087

We present results of high average power mid-infrared (mid-IR) generation employingsynchronized nanosecond pulsed ytterbium and erbium fiber amplifier systems using periodicallypoled lithium niobate. We generate greater than 6 W of mid-IR radiation tunable in wavelengthbetween 3.31–3.48μm, at power conversion efficiencies exceeding 75%, with near diffractionlimited beam quality (M2= 1.4). Numerical modeling is used to verify the experimental resultsin differing pump depletion regimes.

Journal article

Runcorn T, Murray RT, Taylor JR, 2017, Microjoule Nanosecond 560 nm Source by SHG of a Combined Yb-Raman Fiber Amplifier, Pages: ATu1A-7

Conference paper

Murray RT, Runcorn T, Guha S, Taylor JRet al., 2017, Fibre MOPA Pumped MIR Parametric Wavelength Conversion, Pages: AM2A-1

Conference paper

Woodward RI, Murray RT, Phelan CF, de Oliveira R, Runcorn T, Kelleher E, Li S, de Oliveira E, Fechine G, Eda G, de Matos CJSet al., 2016, Characterization of the second- and third-order nonlinear optical susceptibilities of monolayer MoS2 using multiphoton microscopy, 2D Materials, Vol: 4, ISSN: 2053-1583

We report second- and third-harmonic generation in monolayer MoS2 as a tool for imaging and accurately characterizing the material's nonlinear optical properties under 1560 nm excitation. Using a surface nonlinear optics treatment, we derive expressions relating experimental measurements to second- and third-order nonlinear sheet susceptibility magnitudes, obtaining values of $| {\chi }_{{\rm{s}}}^{(2)}| \ =2.0\times {10}^{-20}$ m2 V−1 and, for the first time for monolayer MoS2, $| {\chi }_{{\rm{s}}}^{(3)}| =1.7\times {10}^{-28}$ m3 V−2. These sheet susceptibilities correspond to effective bulk nonlinear susceptibility values of $| {\chi }_{{\rm{b}}}^{(2)}| =2.9\ \times {10}^{-11}$ m V−1 and $| {\chi }_{{\rm{b}}}^{(3)}| =2.4\times {10}^{-19}$ m2 V−2, accounting for the sheet thickness. Experimental comparisons between MoS2 and graphene are also performed, demonstrating ~3.4 times stronger third-order sheet nonlinearity in monolayer MoS2, highlighting the material's potential for nonlinear photonics in the telecommunications C band.

Journal article

Murray RT, Runcorn TH, Kelleher EJR, Guha S, Taylor JRet al., 2016, Mid-Infrared Difference Frequency-Generation with Synchronized Fiber Lasers, Advanced Solid State Lasers

Conference paper

Murray RT, Runcorn TH, Kelleher EJR, Taylor JRet al., 2016, Watt-level Nanosecond 589 nm Source by SHG of a Cascaded Raman Amplifier, Advanced Solid State Lasers 2016

Conference paper

Woodward RI, Murray RT, Phelan CF, de Oliveira REP, Li S, Eda G, de Matos CJSet al., 2016, Characterization of the nonlinear susceptibility of monolayer MoS2 using second- and third-harmonic generation microscopy, CLEO:2016 Laser Science to Photonic Applications, Publisher: OSA, Pages: STu1R.3-STu1R.3

Second- and third-harmonic generation microscopy of monolayer MoS2 is reported for imaging and characterization of the material's nonlinearity. A telecommunication wavelength pump is used, revealing the material's promise for use in nonlinear optical devices.

Conference paper

Murray RT, Runcorn TH, Kelleher EJR, Taylor JRet al., 2016, Highly efficient mid-infrared difference-frequency generation using synchronously pulsed fiber lasers, Optics Letters, Vol: 41, Pages: 2446-2449, ISSN: 1539-4794

We report the development of a high average power, picosecond-pulse, mid-infrared source based on difference-frequency generation (DFG) of two synchronous master oscillator power fiber amplifier systems. The generated idler can be tuned over the range 3.28–3.45 μm delivering greater than 3.4 W of average power, with a maximum pump to total DFG power conversion efficiency of 78%. The benefits of a synchronously pumped scheme, compared to CW seeding of DFG sources, are discussed.

Journal article

Murray RT, Kelleher EJR, Runcorn TH, Taylor JRet al., 2016, Multi-Watt-level 3.28-3.45 um difference frequency generation using synchronous fiber lasers, Mid-Infrared Coherent Sources 2016

Conference paper

Runcorn TH, Murray RT, Kelleher EJR, Popov SV, Taylor JRet al., 2015, Duration-tunable picosecond source at 560 nm with watt-level average power, OPTICS LETTERS, Vol: 40, Pages: 3085-3088, ISSN: 0146-9592

Journal article

Runcorn T, Legg T, murray RT, kelleher EJR, popov SV, taylor JRet al., 2015, Fiber-integrated frequency-doubling of a picosecond Raman laser to 560 nm, Optics Express, Vol: 23, Pages: 15728-15733, ISSN: 1094-4087

We report the development of a fiber-integrated picosecond source at 560 nm by second harmonic generation of a Raman fiber laser. A picosecond ytterbium master oscillator power fiber amplifier is used to pulse-pump a Raman amplifier, which is seeded by a continuous wave distributed feedback laser diode operating at 1120 nm. The pulse train generated at 1120 nm is frequency-doubled in a fiber-coupled periodically-poled lithium niobate crystal module, producing 450 mW of average power at 560 nm with a pulse duration of 150 ps at a repetition rate of 47.5 MHz. The near diffraction-limited (M2 = 1.02) collimated output beam is ideal for super-resolution microscopy applications.

Journal article

Legg T, Robertson A, Eckardt R, Runcorn T, Hu D, Murray R, Kelleher E, Popov S, Taylor Jet al., 2015, Fiber-Integrated Second Harmonic Generation Modules for Visible and Near-Visible Picosecond Pulse Generation, Conference on Nonlinear Frequency Generation and Conversion - Materials, Devices, and Applications XIV, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X

Conference paper

Hu DJJ, Murray RT, Legg T, Runcorn TH, Zhang M, Woodward RI, Lim JL, Wang Y, Luan F, Gu B, Shum PP, Kelleher EJR, Popov SV, Taylor JRet al., 2014, Fiber-integrated 780 nm source for visible parametric generation, OPTICS EXPRESS, Vol: 22, Pages: 29726-+, ISSN: 1094-4087

Journal article

Runcorn TH, Murray RT, Kelleher EJR, Popov SV, Taylor JRet al., 2014, Watt-level, duration-tunable picosecond source at 560 nm by second-harmonic generation of a raman fiber laser

Conference paper

Murray RT, Kelleher EJR, Popov SV, Mussot A, Kudlinski A, Taylor JRet al., 2013, Widely tunable polarization maintaining photonic crystal fiber based parametric wavelength conversion, OPTICS EXPRESS, Vol: 21, Pages: 15826-15833, ISSN: 1094-4087

Journal article

Kudlinski A, Bendahmane A, Labat D, Virally S, Murray RT, Kelleher EJR, Mussot Aet al., 2013, Simultaneous scalar and cross-phase modulation instabilities in highly birefringent photonic crystal fiber, OPTICS EXPRESS, Vol: 21, Pages: 8437-8443, ISSN: 1094-4087

Journal article

Murray RT, Kelleher EJR, Popov SV, Mussot A, Kudlinski A, Taylor JRet al., 2013, Compact and broadly tunable near-visible parametric wavelength converter based on polarization-maintaining photonic-crystal fiber, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020

Conference paper

Murray RT, Kelleher EJR, Popov SV, Mussot A, Kudlinski A, Taylor JRet al., 2012, Synchronously pumped photonic crystal fiber-based optical parametric oscillator, OPTICS LETTERS, Vol: 37, Pages: 3156-3158, ISSN: 0146-9592

Journal article

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