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  1. Article ; Online: Confinement and absorption layer free nanosecond laser shock peening of tungsten and its alloy.

    Banerjee, Saumyabrata / Spear, Jacob

    Optics letters

    2022  Volume 47, Issue 18, Page(s) 4736–4739

    Abstract: Traditionally, nanosecond laser shock peening (ns-LSP) of metals requires an additional application of an absorption layer (black paint) and more importantly a confinement layer (typically water or transparent material) on the workpiece for introduction ... ...

    Abstract Traditionally, nanosecond laser shock peening (ns-LSP) of metals requires an additional application of an absorption layer (black paint) and more importantly a confinement layer (typically water or transparent material) on the workpiece for introduction of compressive stresses. In this paper, we demonstrate for the first time, to the best of our knowledge, introduction of compressive stresses in pure tungsten and its alloy TAM7525 (75% tungsten and 25% copper) without any absorption and confinement layer for ns-LSP. Peak compressive stresses of -349 MPa and -357 MPa were measured in pure tungsten and TAM7525, respectively, when a 0.25-cm
    Language English
    Publishing date 2022-09-12
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.472800
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Generation of Joule-level green bursts of nanosecond pulses from a DPSSL amplifier.

    Mason, Paul / Barrett, Hugh / Banerjee, Saumyabrata / Butcher, Thomas / Collier, John

    Optics express

    2023  Volume 31, Issue 12, Page(s) 19510–19522

    Abstract: A new approach to generation of a burst of high-energy green pulses by placing a high-energy multi-slab Yb:YAG DPSSL amplifier and SHG crystal inside a regenerative cavity is presented. In a proof-of-concept test, stable generation of a burst of six ... ...

    Abstract A new approach to generation of a burst of high-energy green pulses by placing a high-energy multi-slab Yb:YAG DPSSL amplifier and SHG crystal inside a regenerative cavity is presented. In a proof-of-concept test, stable generation of a burst of six green (515 nm) pulses, each 10 ns in duration and separated by 29.4 ns (34 MHz), with 2.0 J total energy has been demonstrated at 1 Hz from a non-optimized ring cavity design. A maximum individual green pulse energy of 580 mJ was produced from a 1.78 J circulating infrared (1030 nm) pulse (average fluence 0.9 J/cm
    Language English
    Publishing date 2023-06-28
    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.492263
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Laser shock peening of tungsten and its dependency on polarisation of light for induced compressive stresses.

    Banerjee, Saumyabrata / Spear, Jacob / Dalton, Patrick J

    Optics express

    2022  Volume 30, Issue 18, Page(s) 32084–32096

    Abstract: We report on laser shock peening (LSP) of tungsten, a material used as a divertor in Tokamak machine for magnetic confinement fusion reactions such as the ITER facility (France) and JET facility (UK). Peak compressive stresses of -370 MPa and depths of ... ...

    Abstract We report on laser shock peening (LSP) of tungsten, a material used as a divertor in Tokamak machine for magnetic confinement fusion reactions such as the ITER facility (France) and JET facility (UK). Peak compressive stresses of -370 MPa and depths of up to 1.75 mm were recorded when 0.25 cm
    Language English
    Publishing date 2022-10-14
    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.467937
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: High energy, high pulse rate laser operation using crystalline adhesive-free bonded Yb:YAG slabs.

    De Vido, Mariastefania / Jonathan Phillips, P / Meissner, David / Meissner, Stephanie / Quinn, Gary / Banerjee, Saumyabrata / Divoky, Martin / Mason, Paul D

    Optics express

    2023  Volume 31, Issue 17, Page(s) 28101–28111

    Abstract: We report on the successful amplification of 10 ns pulses to 10 J energy at 10 Hz in a DiPOLE laser amplifier using crystalline Yb:YAG/Cr:YAG composite slabs manufactured using adhesive-free bonding (AFB) technology. We demonstrate that bonded slabs are ... ...

    Abstract We report on the successful amplification of 10 ns pulses to 10 J energy at 10 Hz in a DiPOLE laser amplifier using crystalline Yb:YAG/Cr:YAG composite slabs manufactured using adhesive-free bonding (AFB) technology. We demonstrate that bonded slabs are suitable for operation in high energy cryogenic laser amplifiers. We also report on frequency doubling of the beam amplified in the bonded slabs. When the pulse energy of the output infrared beam is set to 5 J, a pulse energy of 3.9 J is achieved in the green (corresponding to 78% conversion efficiency). Results demonstrate that AFB technology is suitable for producing large-sized gain material slabs and can overcome current limitations in the manufacture of large-aperture gain material pieces. We believe this work will facilitate energy scaling of high energy lasers where aperture scaling of optical elements is not achievable via conventional manufacturing techniques.
    Language English
    Publishing date 2023-09-14
    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.497948
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Second and third harmonic conversion of a kilowatt average power, 100-J-level diode pumped Yb:YAG laser in large aperture LBO.

    Phillips, Jonathan P / Banerjee, Saumyabrata / Mason, Paul / Smith, Jodie / Spear, Jacob / De Vido, Mariastefania / Ertel, Klaus / Butcher, Thomas / Quinn, Gary / Clarke, Danielle / Edwards, Chris / Hernandez-Gomez, Cristina / Collier, John

    Optics letters

    2021  Volume 46, Issue 8, Page(s) 1808–1811

    Abstract: We report on the successful demonstration of second and third harmonic conversion of a high pulse energy, high average power 1030 nm diode pumped Yb-doped yttrium aluminum garnet (Yb:YAG) nanosecond pulsed laser in a large aperture lithium triborate (LBO) ...

    Abstract We report on the successful demonstration of second and third harmonic conversion of a high pulse energy, high average power 1030 nm diode pumped Yb-doped yttrium aluminum garnet (Yb:YAG) nanosecond pulsed laser in a large aperture lithium triborate (LBO) crystal. We demonstrated generation of 59.7 J at 10 Hz (597 W) at 515 nm (second harmonic) and of 65.0 J at 1 Hz (65 W) at 343 nm (third harmonic), with efficiencies of 66% and 68%, respectively. These results, to the best of our knowledge, represent the highest energy and power reported for frequency conversion to green and UV-A wavelengths.
    Language English
    Publishing date 2021-04-16
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.419861
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: 150 J DPSSL operating at 1.5 kW level.

    Divoký, Martin / Pilař, Jan / Hanuš, Martin / Navrátil, Petr / Denk, Ondřej / Severová, Patricie / Mason, Paul / Butcher, Thomas / Banerjee, Saumyabrata / De Vido, Mariastefania / Edwards, Chris / Collier, John / Smrž, Martin / Mocek, Tomas

    Optics letters

    2021  Volume 46, Issue 22, Page(s) 5771–5773

    Abstract: We report on obtaining output energy of 146 J in 10 ns long pulses at 10 Hz repetition rate from Bivoj, a multi-Joule multi-slab cryogenic gas-cooled diode pumped solid state laser, by overcoming its damage threshold bottleneck. This is a 40% energy and ... ...

    Abstract We report on obtaining output energy of 146 J in 10 ns long pulses at 10 Hz repetition rate from Bivoj, a multi-Joule multi-slab cryogenic gas-cooled diode pumped solid state laser, by overcoming its damage threshold bottleneck. This is a 40% energy and power increase of the laser system in comparison to our previous publication and to the most powerful multi-Joule high power laser system.
    Language English
    Publishing date 2021-11-15
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.444902
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. 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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  8. Article ; Online: Stable high-energy, high-repetition-rate, frequency doubling in a large aperture temperature-controlled LBO at 515  nm.

    Phillips, Jonathan P / Banerjee, Saumyabrata / Ertel, Klaus / Mason, Paul / Smith, Jodie / Butcher, Thomas / De Vido, Mariastefania / Edwards, Chris / Hernandez-Gomez, Cristina / Collier, John

    Optics letters

    2020  Volume 45, Issue 10, Page(s) 2946–2949

    Abstract: We report on frequency doubling of high-energy, high-repetition-rate ns pulses from a cryogenically gas cooled, multi-slab Yb:YAG laser system, using a type-I phase-matched lithium triborate (LBO) crystal. Pulse energy of 4.3 J was extracted at 515 nm ... ...

    Abstract We report on frequency doubling of high-energy, high-repetition-rate ns pulses from a cryogenically gas cooled, multi-slab Yb:YAG laser system, using a type-I phase-matched lithium triborate (LBO) crystal. Pulse energy of 4.3 J was extracted at 515 nm for a fundamental input of 5.4 J at 10 Hz (54 W), corresponding to a conversion efficiency of 77%. However, during long-term operation, a significant reduction of efficiency (more than 25%) was observed owing to the phase mismatch arising due to the temperature-dependent refractive index change in the crystal. This forced frequent angle tuning of the crystal to recover the second-harmonic generation (SHG) energy. More than a five-fold improvement in energy stability of SHG was observed when the LBO crystal was mounted in an oven, and its temperature was controlled at 27°C. Stable frequency doubling with 0.8% rms energy variation was achieved at a higher input power of 74 W when the LBO temperature was controlled at 50°C.
    Language English
    Publishing date 2020-05-15
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.383129
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: High energy, high repetition rate, second harmonic generation in large aperture DKDP, YCOB, and LBO crystals.

    Phillips, Jonathan P / Banerjee, Saumyabrata / Smith, Jodie / Fitton, Mike / Davenne, Tristan / Ertel, Klaus / Mason, Paul / Butcher, Thomas / De Vido, Mariastefania / Greenhalgh, Justin / Edwards, Chris / Hernandez-Gomez, Cristina / Collier, John

    Optics express

    2016  Volume 24, Issue 17, Page(s) 19682–19694

    Abstract: We report on type-I phase-matched second harmonic generation (SHG) in three nonlinear crystals: DKDP (98% deuteration), YCOB (XZ plane), and LBO (XY plane), of 8 J, 10 Hz cryogenic gas cooled Yb:YAG laser operating at 1029.5 nm. DKDP exhibited an ... ...

    Abstract We report on type-I phase-matched second harmonic generation (SHG) in three nonlinear crystals: DKDP (98% deuteration), YCOB (XZ plane), and LBO (XY plane), of 8 J, 10 Hz cryogenic gas cooled Yb:YAG laser operating at 1029.5 nm. DKDP exhibited an efficiency of 45% at a peak fundamental intensity of 0.24 GW/cm<sup>2</sup> for 10 Hz operation at 10 ns. At the same intensity and repetition rate, YCOB and LBO showed 50% and 65% conversion efficiencies, respectively. Significant improvement in conversion efficiency, to a maximum of 82%, was demonstrated in LBO at 0.7 GW/cm<sup>2</sup> and 10 Hz, generating output energy of 5.6 J at 514.75 nm, without damage or degradation. However, no improvement in conversion efficiency was recorded for YCOB at this increased intensity. Additionally, we present theoretically calculated temperature maps for both 10 J and 100 J operation at 10 Hz, and discuss the suitability of these three crystals for frequency conversion of a 100 J, 10 Hz diode pumped solid state laser (DPSSL).
    Language English
    Publishing date 2016-08-22
    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.24.019682
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: High-efficiency 10 J diode pumped cryogenic gas cooled Yb:YAG multislab amplifier.

    Banerjee, Saumyabrata / Ertel, Klaus / Mason, Paul D / Phillips, P Jonathan / Siebold, Mathias / Loeser, Markus / Hernandez-Gomez, Cristina / Collier, John L

    Optics letters

    2012  Volume 37, Issue 12, Page(s) 2175–2177

    Abstract: We report on the first demonstration of a diode-pumped, gas cooled, cryogenic multislab Yb:YAG amplifier. The performance was characterized over a temperature range from 88 to 175 K. A maximum small-signal single-pass longitudinal gain of 11.0 was ... ...

    Abstract We report on the first demonstration of a diode-pumped, gas cooled, cryogenic multislab Yb:YAG amplifier. The performance was characterized over a temperature range from 88 to 175 K. A maximum small-signal single-pass longitudinal gain of 11.0 was measured at 88 K. When amplifying nanosecond pulses, recorded output energies were 10.1 J at 1 Hz in a four-pass extraction geometry and 6.4 J at 10 Hz in a three-pass setup, corresponding to optical to optical conversion efficiencies of 21% and 16%, respectively. To our knowledge, this represents the highest pulse energy so far obtained from a cryo-cooled Yb-laser and the highest efficiency from a multijoule diode pumped solid-state laser system.
    Language English
    Publishing date 2012-06-15
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.37.002175
    Database MEDical Literature Analysis and Retrieval System OnLINE

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