Imperial College London

ROY TAYLOR

Faculty of Natural SciencesDepartment of Physics

Professor of Ultrafast Physics and Technology
 
 
 
//

Contact

 

+44 (0)20 7594 7786jr.taylor Website CV

 
 
//

Location

 

636ABlackett LaboratorySouth Kensington Campus

//

Summary

 

Publications

Publication Type
Year
to

577 results found

Taylor JR, 2023, Early optical soliton research at Imperial College London, OPTICS COMMUNICATIONS, Vol: 536, ISSN: 0030-4018

Journal article

Taylor JR, 2023, Fiber Laser Driven Three-Micron Source Development Based on Difference Frequency Generation, OPTOELECTRONICS INSTRUMENTATION AND DATA PROCESSING, Vol: 59, Pages: 18-27, ISSN: 8756-6990

Journal article

Battle RA, Chandran AM, Runcorn TH, Mussot A, Kudlinski A, Murray RT, Taylor JRet al., 2023, Mid-infrared difference-frequency generation directly pumped by a fiber four-wave mixing source, OPTICS LETTERS, Vol: 48, Pages: 387-390, ISSN: 0146-9592

Journal article

Battle RA, Simon D, Xiang Y, Robinson K, Runcorn TH, Murray RT, Taylor JR, Takats Zet al., 2023, High resolution mass spectrometry imaging using 3 micron laser ablation, ISSN: 1605-7422

We report a single-cell level resolution (≤10 µm), laser desorption-based mass spectrometry imaging platform. An optical parametric amplifier is used to generate ∼100 ps, 200 nJ pulses at around 3 µm with a maximum repetition rate of 500 kHz. The pulses are tightly focussed on to fresh frozen animal tissue samples with a thickness of 10 µm. Small volumes of tissue are readily ablated by the laser and are subsequently chemically analyzed using a Rapid Evaporative Ionization Mass Spectrometry (REIMS) source installed on a time of flight mass analyzer. Raster scanning the samples through the laser focus enables the acquisition of mass spectrometry data which can be processed into images with pixel size 10 µm without oversampling, corresponding to cellular level resolution.

Conference paper

Ribenek VA, Korobko DA, Fotiadi AA, Taylor JRet al., 2022, Supermode noise mitigation and repetition rate control in harmonic mode-locked fiber laser implemented through the pulse train interaction with co-lased CW radiation, OPTICS LETTERS, Vol: 47, Pages: 5236-5239, ISSN: 0146-9592

Journal article

Battle RA, Chandran AM, Runcorn TH, Mussot A, Kudlinski A, Murray RT, Taylor JRet al., 2022, Optical parametric amplification seeded by four-wave mixing in photonic crystal fibers, Conference on Nonlinear Frequency Generation and Conversion - Materials and Devices XXI at SPIE LASE Conference, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X

Conference paper

Chandran A, Battle RA, Murray RT, Runcorn T, Taylor JRet al., 2021, Watt-level 743 nm source by second-harmonic generation of a cascaded phosphosilicate Raman fiber amplifier, Optics Express, Vol: 29, Pages: 41467-41474, ISSN: 1094-4087

We demonstrate a nanosecond pulsed 743 nm source through second-harmonic generation of a cascaded phosphosilicate Raman fiber amplifier system operating at 1485 nm. The amplifier is pumped by a 1240 nm phosphosilicate Raman fiber amplifier and seeded with a continuous-wave 1485 nm diode. This 1485 nm light is used for second-harmonic generation in periodically poled lithium niobate. Greater than 1 W of average power is generated at 743 nm with a corresponding pulse energy of 220 nJ at a repetition rate of 5 MHz. The source displays excellent beam quality (M2𝑥,𝑦 ≤ 1.18) with ideal parameters for biomedical imaging applications.

Journal article

Fotiadi AA, Korobko DA, Zolotovskii IO, Taylor JRet al., 2021, Brillouin-like amplification in rare-earth-doped optical fibers, OPTICS EXPRESS, Vol: 29, Pages: 40345-40359, ISSN: 1094-4087

Journal article

Murray RT, Chandran AM, Battle RA, Runcorn TH, Schunemann PG, Zawilski KT, Guha S, Taylor JRet al., 2021, Seeded optical parametric generation in CdSiP2 pumped by a Raman fiber amplifier at 124  µm, Optics Letters, Vol: 46, Pages: 2039-2039, ISSN: 0146-9592

We report a seeded optical parametric generator (OPG) producing tunable radiation from 4.2–4.6 µm. The seeded OPG employs a 13 mm long CdSiP2 (CSP) crystal cut for non-critical phase-matching, pumped by a nanosecond-pulsed, MHz repetition rate Raman fiber amplifier system at 1.24 µm. A filtered, continuous-wave fiber supercontinuum source at 1.72 µm is used as the seed. The source generates up to 0.25 W of mid-infrared (MIR) idler power with a total pump conversion of 42% (combined signal and idler).

Journal article

Murray RT, Chandran AM, Battle RA, Runcorn TH, Schunemann PG, Zawilski KT, Guha S, Taylor JRet al., 2021, Seeded optical parametric generation in CdSiP2 pumped by a nanosecond pulsed, MHz repetition rate Raman fiber amplifier at 1.24 µm, Nonlinear Frequency Generation and Conversion: Materials and Devices XX, Publisher: SPIE, Pages: 1-10

We report a CdSiP2 (CSP) based seeded optical parametric generator (OPG), emitting sub-nanosecond duration, 3 MHz repetition rate, wavelength tunable mid-infrared (MIR) light at 4.2-4.6 μm. We generate up to 0.25 W at 4.2 μm with a total pump conversion efficiency of 42%. The OPG is pumped by a 1.24 μm Raman fiber amplifier system. This is the first demonstration of pumping CSP with a Raman fiber source in this region, and we show that Raman fiber sources in the near-infrared (NIR) are ideal pump sources for non-critically phasematched (NCPM) CSP devices. Pumping CSP at 1.24 μm permits the use of NCPM whilst decreasing the negative effects of both two-photon absorption and linear absorption losses, when compared to conventional 1 μm pumping. This offers a potential advantage for MIR power scaling of CSP parametric devices due to a reduced thermal load in the crystal from residual pump absorption. The OPG is seeded with a continuous-wave fiber supercontinuum source emitting radiation in the 1.7 μm region, to lower the threshold pump intensity required for efficient conversion. NCPM and temperature tuning of the crystal allow for simple wavelength tuning of the idler radiation. We report on laser damage induced by elevated crystal temperatures, which we propose is linked to the decrease in CSP bandgap energy with increasing temperature.

Conference paper

Chandran AM, Battle RA, Murray RT, Runcorn TH, Taylor JRet al., 2021, 743 nm Source by SHG of a Cascaded Phosphosilicate Raman Fiber Amplifier

We demonstrate a nanosecond-pulsed 743 nm source by second harmonic generation of a cascaded phosphosilicate Raman fiber amplifier operating at 1485 nm. The source emits >1 W of 743 nm average power at a 5 MHz repetition rate.

Conference paper

Murray RT, Chandran AM, Battle RA, Runcorn TH, Schunemann PG, Zawilski KT, Guha S, Taylor JRet al., 2021, CdSiP<inf>2</inf> based mid-infrared optical parametric sources pumped with Raman fiber amplifiers

CdSiP2 (CSP) is a nonlinear optical semiconductor which can phasematch pump wavelengths throughout the near-infrared (NIR) to generate mid-infrared (MIR) light through parametric three-wave mixing. In this work, we investigate the unique combination of NIR Raman fiber amplifiers around 1.24 µm and non-critical phasematching in CSP, to demonstrate tunable sources in the 4-5 µm MIR region.

Conference paper

Chandran A, Runcorn T, Murray R, Taylor Jet al., 2019, Nanosecond pulsed 620 nm source by frequency-doubling a phosphosilicate Raman fiber amplifier, Optics Letters, Vol: 44, Pages: 6025-6028, ISSN: 0146-9592

We demonstrate a nanosecond pulsed source at 620 nm with watt-level average power by frequency-doubling a 1240 nm phosphosilicate Raman fiber amplifier. A gain-switched laser diode operating at 1064 nm is amplified in an ytterbium fiber master oscillator power amplifier system and then converted to 1240 nm using a phosphosilicate Raman fiber amplifier with a conversion efficiency of up to 66%. The Raman fiber amplifier is seeded with a continuous-wave 1240 nm laser diode to obtain narrow-linewidth radiation, which is subsequently frequency-doubled in a periodically poled lithium tantalate crystal. A maximum average power of 1.5 W is generated at 620 nm, corresponding to a pulse energy of 300 nJ at a repetition rate of 5 MHz. The source has excellent beam quality (M2≤1.16) and an optical efficiency (1064 nm to 620 nm) of 20%, demonstrating an effective architecture for generating red pulsed light for biomedical imaging applications.

Journal article

Chandran AM, Runcorn TH, Murray RT, Taylor JRet al., 2019, 620 nm source by second harmonic generation of a phosphosilicate raman fiber amplifier, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020

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

Chandran AM, Runcorn TH, Tmurray R, Taylor JRet al., 2019, 620nm Source by Second Harmonic Generation of a Phosphosilicate Raman Fiber Amplifier

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

Woodward RI, Kelleher EJR, Runcorn TH, Loranger S, Popa D, Wittwer VJ, Ferrari AC, Popov SV, Kashyap R, Taylor JRet al., 2019, Nanosecond to picosecond fiber bragg grating compression of giant-chirped pulses from an ultra-long mode-locked 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, Vol: 11, 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

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, 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

Taylor JR, 2017, Supercontinuum sources - past, present - any future?, Conference on Lasers and Electro-Optics (CLEO), Publisher: Optical Society of America Publishing, ISSN: 2160-9020

For nearly fifty years the supercontinuum source, a result of the understanding and control of the underlying physical processes, has evolved as a scientific and commercial success, providing spectral versatility well beyond the limitations of the transmission window of silica and pumped by diverse temporal formats. The relevant physical processes, characteristics and current status are reviewed with a look to future development and application.

Conference paper

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

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

Taylor JR, 2016, Tutorial on fiber-based sources for biophotonic applications, Journal of Biomedical Optics, Vol: 21, ISSN: 1560-2281

Fiber-based lasers and master oscillator power fiber amplifier configurations are described. These allow spectral versatility coupled with pulse width and pulse repetition rate selection in compact and efficient packages. This is enhanced through the use of nonlinear optical conversion in fibers and fiber-coupled nonlinear crystals, which can be integrated to provide all-fiber pump sources for diverse application. The advantages and disadvantages of sources based upon supercontinuum generation, stimulated Raman conversion, four-wave mixing, parametric generation and difference frequency generation, allowing spectral coverage from the UV to the mid-infrared, are considered.

Journal article

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

This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.

Request URL: http://wlsprd.imperial.ac.uk:80/respub/WEB-INF/jsp/search-html.jsp Request URI: /respub/WEB-INF/jsp/search-html.jsp Query String: respub-action=search.html&id=00005834&limit=30&person=true