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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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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
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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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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
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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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Article ; Online: Picosecond optical parametric chirped pulse amplifier as a preamplifier to generate high-energy seed pulses for contrast enhancement.

Musgrave, Ian / Shaikh, Waseem / Galimberti, Marco / Boyle, Alexis / Hernandez-Gomez, Cristina / Lancaster, Kate / Heathcote, Robert

Applied optics

2010 Volume 49, Issue 33, Page(s) 6558–6562

Abstract: We present the design, implementation, and testing of a novel picosecond optical parametric preamplifier system to generate high-energy seed pulses for the Vulcan laser facility. The preamplifier amplifies 100 fs pulses stretched to 3 ps pulses from 10 ... ...

Abstract	We present the design, implementation, and testing of a novel picosecond optical parametric preamplifier system to generate high-energy seed pulses for the Vulcan laser facility. The preamplifier amplifies 100 fs pulses stretched to 3 ps pulses from 10 pJ to 70 μJ in a single stage of amplification before the pulses are further amplified in the Vulcan high-power Nd:glass laser facility to the petawatt power level. This increased seed energy has led to an improvement of the nanosecond amplified spontaneous emission contrast intensity to 10(-10) of the main pulse, without degrading the output of the laser system.
Language	English
Publishing date	2010-11-20
Publishing country	United States
Document type	Journal Article
ISSN	1539-4522
ISSN (online)	1539-4522
DOI	10.1364/AO.49.006558
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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
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Article ; Online: Evaluating laser-driven Bremsstrahlung radiation sources for imaging and analysis of nuclear waste packages.

Journal of hazardous materials

2016 Volume 318, Page(s) 694–701

Abstract: A small scale sample nuclear waste package, consisting of a 28mm diameter uranium penny encased in grout, was imaged by absorption contrast radiography using a single pulse exposure from an X-ray source driven by a high-power laser. The Vulcan laser was ... ...

Abstract	A small scale sample nuclear waste package, consisting of a 28mm diameter uranium penny encased in grout, was imaged by absorption contrast radiography using a single pulse exposure from an X-ray source driven by a high-power laser. The Vulcan laser was used to deliver a focused pulse of photons to a tantalum foil, in order to generate a bright burst of highly penetrating X-rays (with energy >500keV), with a source size of <0.5mm. BAS-TR and BAS-SR image plates were used for image capture, alongside a newly developed Thalium doped Caesium Iodide scintillator-based detector coupled to CCD chips. The uranium penny was clearly resolved to sub-mm accuracy over a 30cm(2) scan area from a single shot acquisition. In addition, neutron generation was demonstrated in situ with the X-ray beam, with a single shot, thus demonstrating the potential for multi-modal criticality testing of waste materials. This feasibility study successfully demonstrated non-destructive radiography of encapsulated, high density, nuclear material. With recent developments of high-power laser systems, to 10Hz operation, a laser-driven multi-modal beamline for waste monitoring applications is envisioned.
Language	English
Publishing date	2016-11-15
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	1491302-1
ISSN	1873-3336 ; 0304-3894
ISSN (online)	1873-3336
ISSN	0304-3894
DOI	10.1016/j.jhazmat.2016.07.057
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Article: Characterization of the backscattered radiation from petawatt laser matter interactions.

Vernon, Edwina D / Musgrave, Ian O / Green, James / Heathcote, Robert / Lancaster, Kate L / Mendes, Cedric / Hawkes, Steve J / Hernandez-Gomez, Cristina / Pepler, Dave A

Applied optics

2008 Volume 47, Issue 18, Page(s) 3258–3263

Abstract: The development of high peak power and energy laser systems require the assurance that any backscattered radiation will not lead to damage of the laser system. We present the characterization of the backscattered radiation for different target types and ... ...

Abstract	The development of high peak power and energy laser systems require the assurance that any backscattered radiation will not lead to damage of the laser system. We present the characterization of the backscattered radiation for different target types and conditions at petawatt power levels and intensities (>10(20)W/cm2). We observe that radiation is generated between 700 and 900 nm, as well as the expected self emission and laser fundamental. The percentage of the incident light backscattered reduces as a function of the incident energy and is typically <1% for petawatt laser interactions.
Language	English
Publishing date	2008-06-04
Publishing country	United States
Document type	Journal Article
ISSN	1559-128X
ISSN	1559-128X
DOI	10.1364/ao.47.003258
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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
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