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  1. AU="Collier, John L"
  2. AU="Min, Ai-Lian"
  3. AU="Chen, Jingyuan"
  4. AU="Salama, Asmaa"
  5. AU=Johnson R
  6. AU="Straathof, Karin"
  7. AU="Scanlon, Robert"
  8. AU="de la Fuente, M"
  9. AU="Li, Hezhang"
  10. AU="Portillo, María P."
  11. AU="Winter, Theresa"
  12. AU="Antoine Fakhry Abdelmassih"
  13. AU=Barazzoni Rocco
  14. AU="Yuan, Mingyang"

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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 ; 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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  4. Article ; Online: ASE suppression in a high energy Titanium sapphire amplifier.

    Ertel, Klaus / Hooker, Chris / Hawkes, Steve J / Parry, Bryn T / Collier, John L

    Optics express

    2008  Volume 16, Issue 11, Page(s) 8039–8049

    Abstract: The energy required to generate ultrashort pulses with petawatt peak power from a Ti:sapphire laser system is a few tens of joules. To achieve this, the final amplifier must have a gain region of around 5 cm diameter that is uniformly pumped at high ... ...

    Abstract The energy required to generate ultrashort pulses with petawatt peak power from a Ti:sapphire laser system is a few tens of joules. To achieve this, the final amplifier must have a gain region of around 5 cm diameter that is uniformly pumped at high fluence. The high level of amplified spontaneous emission (ASE) in such an amplifier will seriously degrade its performance unless care is taken to minimise the transverse gain and the internal reflections from the crystal edges. In developing the amplifiers for the Astra Gemini laser system, we have combined the techniques of beam homogenisation and double-pass pumping of a lightly-doped crystal with a new index-matched absorber liquid. Our results demonstrate that this combined approach successfully overcomes the problem of gain depletion by ASE in a high-energy Ti:sapphire amplifier.
    MeSH term(s) Aluminum Oxide/chemistry ; Amplifiers, Electronic ; Computer Simulation ; Computer-Aided Design ; Equipment Design ; Equipment Failure Analysis ; Lasers ; Models, Theoretical ; Titanium/chemistry
    Chemical Substances Titanium (D1JT611TNE) ; Aluminum Oxide (LMI26O6933)
    Language English
    Publishing date 2008-03-12
    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.16.008039
    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: Temperature dependent emission and absorption cross section of Yb3+ doped yttrium lanthanum oxide (YLO) ceramic and its application in diode pumped amplifier.

    Banerjee, Saumyabrata / Koerner, Joerg / Siebold, Mathias / Yang, Qiuhong / Ertel, Klaus / Mason, Paul D / Phillips, P Jonathan / Loeser, Markus / Zhang, Haojia / Lu, Shenzhou / Hein, Joachim / Schramm, Ulrich / Kaluza, Malte C / Collier, John L

    Optics express

    2013  Volume 21 Suppl 4, Page(s) A726–34

    Abstract: Temperature dependent absorption and emission cross-sections of 5 at% Yb(3+) doped yttrium lanthanum oxide (Yb:YLO) ceramic between 80K and 300 K are presented. In addition, we report on the first demonstration of ns pulse amplification in Yb:YLO ceramic. ...

    Abstract Temperature dependent absorption and emission cross-sections of 5 at% Yb(3+) doped yttrium lanthanum oxide (Yb:YLO) ceramic between 80K and 300 K are presented. In addition, we report on the first demonstration of ns pulse amplification in Yb:YLO ceramic. A pulse energy of 102 mJ was extracted from a multi-pass amplifier setup. The amplification bandwidth at room temperature confirms the potential of Yb:YLO ceramic for broad bandwidth amplification at cryogenic temperatures.
    Language English
    Publishing date 2013-07-01
    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.21.00A726
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: 100  J-level nanosecond pulsed diode pumped solid state laser.

    Banerjee, Saumyabrata / Mason, Paul D / Ertel, Klaus / Jonathan Phillips, P / De Vido, Mariastefania / Chekhlov, Oleg / Divoky, Martin / Pilar, Jan / Smith, Jodie / Butcher, Thomas / Lintern, Andrew / Tomlinson, Steph / Shaikh, Waseem / Hooker, Chris / Lucianetti, Antonio / Hernandez-Gomez, Cristina / Mocek, Tomas / Edwards, Chris / Collier, John L

    Optics letters

    2016  Volume 41, Issue 9, Page(s) 2089–2092

    Abstract: We report on the successful demonstration of a 100 J-level, diode pumped solid state laser based on cryogenic gas cooled, multi-slab ceramic Yb:YAG amplifier technology. When operated at 175 K, the system delivered a pulse energy of 107 J at a 1 Hz ... ...

    Abstract We report on the successful demonstration of a 100 J-level, diode pumped solid state laser based on cryogenic gas cooled, multi-slab ceramic Yb:YAG amplifier technology. When operated at 175 K, the system delivered a pulse energy of 107 J at a 1 Hz repetition rate and 10 ns pulse duration, pumped by 506 J of diode energy at 940 nm, corresponding to an optical-to-optical efficiency of 21%. To the best of our knowledge, this represents the highest energy obtained from a nanosecond pulsed diode pumped solid state laser. This demonstration confirms the energy scalability of the diode pumped optical laser for experiments laser architecture.
    Language English
    Publishing date 2016-05-01
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.41.002089
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Inter-library loan at ZB MED

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  8. Book ; Thesis: Economic welfare or economic independence as a central problem of development

    Collier, John L

    the case of Sierra Leone, 1951-70

    1975  

    Author's details John Lee Collier
    Language Undetermined
    Publisher Univ. Microfilms
    Publishing place Ann Arbor, Mich
    Document type Book ; Thesis
    Thesis / German Habilitation thesis @Baltimore, Md., Diss. : 1974
    Database Former special subject collection: coastal and deep sea fishing

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  9. Article ; Online: High-spatiotemporal-quality petawatt-class laser system.

    Kiriyama, Hiromitsu / Mori, Michiaki / Nakai, Yoshiki / Shimomura, Takuya / Sasao, Hajime / Tanaka, Momoko / Ochi, Yoshihiro / Tanoue, Manabu / Okada, Hajime / Kondo, Shuji / Kanazawa, Shuhei / Sagisaka, Akito / Daito, Izuru / Wakai, Daisuke / Sasao, Fumitaka / Suzuki, Masayuki / Kotakai, Hideyuki / Kondo, Kiminori / Sugiyama, Akira /
    Bulanov, Sergei / Bolton, Paul R / Daido, Hiroyuki / Kawanishi, Shunichi / Collier, John L / Hernandez-Gomez, Cristina / Hooker, Chris J / Ertel, Klaus / Kimura, Toyoaki / Tajima, Toshiki

    Applied optics

    2010  Volume 49, Issue 11, Page(s) 2105–2115

    Abstract: We have developed a femtosecond high-intensity laser system that combines both Ti:sapphire chirped-pulse amplification (CPA) and optical parametric CPA (OPCPA) techniques and produces more than 30 J broadband output energy, indicating the potential for ... ...

    Abstract We have developed a femtosecond high-intensity laser system that combines both Ti:sapphire chirped-pulse amplification (CPA) and optical parametric CPA (OPCPA) techniques and produces more than 30 J broadband output energy, indicating the potential for achieving peak powers in excess of 500 TW. With a cleaned high-energy seeded OPCPA preamplifier as a front end in the system, for the compressed pulse without pumping the final amplifier, we found that the temporal contrast in this system exceeds 10(10) on the subnanosecond time scales, and is near 10(12) on the nanosecond time scale prior to the peak of the main femtosecond pulse. Using diffractive optical elements for beam homogenization of a 100 J level high-energy Nd:glass green pump laser in a Ti:sapphire final amplifier, we have successfully generated broadband high-energy output with a near-perfect top-hat-like intensity distribution.
    MeSH term(s) Aluminum Oxide/chemistry ; Amplifiers, Electronic ; Equipment Design ; Lasers ; Optics and Photonics ; Risk ; Signal Processing, Computer-Assisted/instrumentation ; Time Factors ; Titanium/chemistry
    Chemical Substances Titanium (D1JT611TNE) ; Aluminum Oxide (LMI26O6933)
    Language English
    Publishing date 2010-04-10
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1539-4522
    ISSN (online) 1539-4522
    DOI 10.1364/AO.49.002105
    Database MEDical Literature Analysis and Retrieval System OnLINE

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