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  1. Article ; Online: Demonstration of stable, long-term operation of a nanosecond pulsed DPSSL at 10 J, 100 Hz.

    De Vido, Mariastefania / Quinn, Gary / Clarke, Danielle / McHugh, Luke / Mason, Paul / Spear, Jacob / Smith, Jodie M / Divoky, Martin / Pilar, Jan / Denk, Ondrej / Butcher, Thomas J / Edwards, Chris / Mocek, Tomas / Collier, John L

    Optics express

    2024  Volume 32, Issue 7, Page(s) 11907–11915

    Abstract: We report on stable, long-term operation of a diode-pumped solid-state laser (DPSSL) amplifying 15 ns pulses at 1029.5 nm wavelength to 10 J energy at 100 Hz pulse rate, corresponding to 1 kW average power, with 25.4% optical-to-optical efficiency. The ... ...

    Abstract We report on stable, long-term operation of a diode-pumped solid-state laser (DPSSL) amplifying 15 ns pulses at 1029.5 nm wavelength to 10 J energy at 100 Hz pulse rate, corresponding to 1 kW average power, with 25.4% optical-to-optical efficiency. The laser was operated at this level for over 45 minutes (∼3 · 10
    Language English
    Publishing date 2024-04-03
    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.521049
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Modelling and measurement of thermal stress-induced depolarisation in high energy, high repetition rate diode-pumped Yb:YAG lasers.

    De Vido, Mariastefania / Mason, Paul D / Fitton, Michael / Eardley, Rupert W / Quinn, Gary / Clarke, Danielle / Ertel, Klaus / Butcher, Thomas J / Jonathan Phillips, P / Banerjee, Saumyabrata / Smith, Jodie / Spear, Jacob / Edwards, Chris / Collier, John L

    Optics express

    2021  Volume 29, Issue 4, Page(s) 5607–5623

    Abstract: In this paper, we present a model to predict thermal stress-induced birefringence in high energy, high repetition rate diode-pumped Yb:YAG lasers. The model calculates thermal depolarisation as a function of gain medium geometry, pump power, cooling ... ...

    Abstract In this paper, we present a model to predict thermal stress-induced birefringence in high energy, high repetition rate diode-pumped Yb:YAG lasers. The model calculates thermal depolarisation as a function of gain medium geometry, pump power, cooling parameters, and input polarisation state. We show that model predictions are in good agreement with experimental observations carried out on a DiPOLE 100 J, 10 Hz laser amplifier. We show that single-pass depolarisation strongly depends on input polarisation state and pumping parameters. In the absence of any depolarisation compensation scheme, depolarisation varies over a range between 5% and 40%. The strong dependence of thermal stress-induced depolarisation on input polarisation indicates that, in the case of multipass amplifiers, the use of waveplates after every pass can reduce depolarisation losses significantly. We expect that this study will assist in the design and optimisation of Yb:YAG lasers.
    Language English
    Publishing date 2021-01-28
    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.417152
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Efficient high-harmonic generation from a stable and compact ultrafast Yb-fiber laser producing 100 μJ, 350 fs pulses based on bendable photonic crystal fiber.

    Feehan, James S / Price, Jonathan H V / Butcher, Thomas J / Brocklesby, William S / Frey, Jeremy G / Richardson, David J

    Applied physics. B, Lasers and optics

    2017  Volume 123, Issue 1, Page(s) 43

    Abstract: The development of an ... ...

    Abstract The development of an Yb
    Language English
    Publishing date 2017-01-11
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1458437-2
    ISSN 1432-0649 ; 0946-2171
    ISSN (online) 1432-0649
    ISSN 0946-2171
    DOI 10.1007/s00340-016-6620-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Modal effects on pump-pulse propagation in an Ar-filled capillary.

    Chapman, Richard T / Butcher, Thomas J / Horak, Peter / Poletti, Francesco / Frey, Jeremy G / Brocklesby, William S

    Optics express

    2010  Volume 18, Issue 12, Page(s) 13279–13284

    Abstract: Accurate three-dimensional modelling of nonlinear pulse propagation within a gas-filled capillary is essential for understanding and improving the XUV yield in high harmonic generation. We introduce both a new model based on a multimode generalized ... ...

    Abstract Accurate three-dimensional modelling of nonlinear pulse propagation within a gas-filled capillary is essential for understanding and improving the XUV yield in high harmonic generation. We introduce both a new model based on a multimode generalized nonlinear Schrödinger equation and a novel spatio-spectral measurement technique to which the model can be compared. The theory shows excellent agreement with the measured output spectrum and the spatio-spectral measurement reveals that the model correctly predicts higher order mode contributions to spectral broadening of the pulse. Fluorescence from the excited argon is used to verify the predicted ion distribution along the capillary.
    Language English
    Publishing date 2010-06-07
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.18.013279
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: DiPOLE: a 10 J, 10 Hz cryogenic gas cooled multi-slab nanosecond Yb:YAG laser.

    Banerjee, Saumyabrata / Ertel, Klaus / Mason, Paul D / Phillips, P Jonathan / De Vido, Mariastefania / Smith, Jodie M / Butcher, Thomas J / Hernandez-Gomez, Cristina / Greenhalgh, R Justin S / Collier, John L

    Optics express

    2015  Volume 23, Issue 15, Page(s) 19542–19551

    Abstract: The Diode Pumped Optical Laser for Experiments (DiPOLE) project at the Central Laser Facility aims to develop a scalable, efficient high pulse energy diode pumped laser amplifier system based on cryogenic gas cooled, multi-slab ceramic Yb:YAG technology. ...

    Abstract The Diode Pumped Optical Laser for Experiments (DiPOLE) project at the Central Laser Facility aims to develop a scalable, efficient high pulse energy diode pumped laser amplifier system based on cryogenic gas cooled, multi-slab ceramic Yb:YAG technology. We present recent results obtained from a scaled down prototype laser system designed for operation at 10 Hz pulse repetition rate. At 140 K, the system generated 10.8 J of energy in a 10 ns pulse at 1029.5 nm when pumped by 48 J of diode energy at 940 nm, corresponding to an optical to optical conversion efficiency of 22.5%. To our knowledge, this represents the highest pulse energy obtained from a cryo cooled Yb laser to date and the highest efficiency achieved by a multi-Joule diode pumped solid state laser system. Additionally, we demonstrated shot-to-shot energy stability of 0.85% rms for the system operated at 7 J, 10 Hz during several runs lasting up to 6 hours, with more than 50 hours in total. We also demonstrated pulse shaping capability and report on beam, wavefront and focal spot quality.
    Language English
    Publishing date 2015-07-27
    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.23.019542
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Gas jet structure influence on high harmonic generation.

    Grant-Jacob, James / Mills, Benjamin / Butcher, Thomas J / Chapman, Richard T / Brocklesby, William S / Frey, Jeremy G

    Optics express

    2011  Volume 19, Issue 10, Page(s) 9801–9806

    Abstract: Gas jets used as sources for high harmonic generation (HHG) have a complex three-dimensional density and velocity profile. This paper describes how the profile influences the generation of extreme-UV light. As the position of the laser focus is varied ... ...

    Abstract Gas jets used as sources for high harmonic generation (HHG) have a complex three-dimensional density and velocity profile. This paper describes how the profile influences the generation of extreme-UV light. As the position of the laser focus is varied along the jet flow axis, we show that the intensity of the output radiation varies by approximately three times, with the highest flux being observed when the laser is focused into the Mach disc. The work demonstrated here will aid in the optimization of HHG flux from gas jet sources. The flux increase is attributed to a density increase within the structure of the jet, which is confirmed by simultaneous imaging of atom and ion fluorescence from the jet.
    Language English
    Publishing date 2011-05-09
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.19.009801
    Database MEDical Literature Analysis and Retrieval System OnLINE

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