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  • Banerjee, Saumyabrata  (26)
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  • 1
    Language: English
    In: Optics letters, 01 May 2016, Vol.41(9), pp.2089-92
    Description: 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.
    Keywords: Ceramics ; Diodes ; Architecture (Computers) ; Energy Management ; Solid State Lasers ; Lasers ; Power Efficiency ; Nanostructure ; Lasers, Optics, and Electronics (So) ; Optics (Ea) ; Optics (Ah);
    ISSN: 01469592
    E-ISSN: 1539-4794
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  • 2
    Language: English
    In: Optics express, 22 August 2016, Vol.24(17), pp.19682-94
    Description: 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/cm2 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/cm2 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).
    ISSN: Optics Express
    E-ISSN: 1094-4087
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  • 3
    Language: English
    In: Optics letters, 15 June 2012, Vol.37(12), pp.2175-7
    Description: 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.
    Keywords: Amplification ; Amplifiers ; Conversion ; Diodes ; Gain ; Gas Cooled ; Nanosecond Pulses ; Solid State Lasers ; Lasers, Optics, and Electronics (So) ; Optics (Ea) ; Optics (Ah);
    ISSN: 01469592
    E-ISSN: 1539-4794
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  • 4
    Language: English
    In: 07 May 2013, Vol.8780, pp.878006-878006-7
    Description: The Diode Pumped Optical Laser Experiments (DiPOLE) project at Central Laser Facility (CLF) is aimed at the development of scalable diode pumped, cryogenic gas cooled, multi-slab Yb:YAG amplifiers. Optimized designs for amplifiers capable of generating kJ pulse energies at multi-Hz repetition rate have been finalised and development of a scaled-down 10J, 10Hz prototype is currently underway at the CLF. We report on the recent results obtained on a 4-pass bowtie as well as 6-pass image relaying multi-pass setup for the DiPOLE amplifier. Additionally, Preliminary results for the amplifier performance with uniform doping (3 × 2at%) compared to gradient doping (2 × 1at% + 2 × 2at%) at cryogenic temperatures, confirms the multi-slab gradient doped design adopted for DiPOLE amplifier.
    Keywords: Engineering
    ISBN: 9780819495822
    ISBN: 0819495824
    ISSN: 0277786X
    E-ISSN: 1996756X
    Source: SPIE Digital Library - Proceedings
    Source: SPIE Digital Library - Journals
    Source: SPIE Digital Library - eBooks
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  • 5
  • 6
    Language: English
    In: 2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC, May 2013, pp.1-1
    Description: Summary form only given. The next generation of ultra-intense laser facilities, currently being developed in European projects such as HiPER [1] and ELI [2], require the development of a laser amplifier technology capable of producing kJ-level pulses with nanosecond duration. These will need to operate at multi-Hz repetition rate and high wall-plug efficiency, which is only possible using diode-pumped solid-state laser (DPSSL) technology. The DiPOLE project at the Central Laser Facility (CLF) is developing a scalable and efficient high pulse energy DPSSL architecture based on a cryogenic gas cooled, multi-slab ceramic Yb:YAG amplifier concept, capable of generating kJ pulse energies. To test the viability of this concept, a scaled-down prototype amplifier has been built, designed to deliver 10 J pulses at 10 Hz repetition rate with an optical-to-optical (η〈sub〉o-o〈/sub〉) efficiency of 25% [4]. Recently, a new multi-pass relay-imaging extraction architecture, including spatial filtering, has been installed that allows up to eight passes through the amplifier head. This has enabled more efficient extraction at higher coolant temperatures, where gain is lower and the impact of ASE is reduced [4], as well as improving the spatial quality of the output beam.In this paper we report details of the new multi-pass architecture and present recent performance results for amplification of ns-pulses at 1030 nm in a six-pass configuration, operating at a coolant temperature of 125 K. In this configuration we have measured up to 9.5 J at 1 Hz and 7.4 J at 10 Hz, corresponding to Ko-o efficiencies of 24% and 23%, respectively, for seed energies of approximately 20 mJ. The measured dependence of conversion on pulse repetition frequency (PRF) is shown in Fig. 1 and Fig. 2. A preliminary assessment of output energy stability has also been undertaken at 10 Hz where stable operation has been achieved for periods of over 5 minutes with a measured rms variation in output energy of 0.7%. It has been found that insufficient isolation between amplifier stages has a detrimental impact on output stability. Low frequency modulation in the output energy is observed but this is directly related to the temperature stability of the gas cooling system.These results confirm the validity of the amplifier design concept and give confidence that the target specification will be reached once greater seed energy is available and round trip losses are reduced further.
    Keywords: Laser Excitation ; Semiconductor Lasers ; Cryogenics ; Gas Lasers ; Laser Stability ; Thermal Stability
    Source: IEEE Conference Publications
    Source: IEEE Xplore
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  • 7
    Language: English
    In: 2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC, May 2013, pp.1-1
    Description: Summary form only given. Over the last few decades the cost reductions and performance increase of diode laser technology has advanced to the point that it has now become a very attractive and generic means of driving laser systems. Diode pumped technology has found widespread uptake in the industrial sector - multi kW CW powers are routine and a wide variety of low energy pulsed systems have been reported - many are commercially available. However the development of pulsed diode pumped systems capable of operating at mutli kW and higher average power levels with very high pulse energy (100'sJ - kJ's) has been very limited.In this presentation I will report on the development of a new diode pumped high energy laser concept at the Rutherford Appleton Laboratory (RAL). Known as "DiPOLE", it has been developed to be an intrinsically scalable system, providing a high average power basis for energetic pulse production from Joules to kiloJoules. Based on large aperture ceramic Yb:YAG configured in a novel geometry and operated at cryogenic temperatures it is a concept that is, in principle, scalable from the Joule level to the multi kiloJoule level. A prototype system, operating at close to 10 J / 10 Hz has been constructed, and a 100 J / 10 Hz version is under development. The DiPOLE architecture is being developed, in part, to capitalize on the applications potential of high peak power (~PW+ level) lasers but operating high average power levels (multi kW). This offers a truly exciting opportunity for both new scientific advance and, possibly of more relevance in today's climate, of new, emergent commercial and industrial applications. Today's generally flashlamp pumped high peak power lasers can be unique, super bright, super fast sources of very energetic electrons, protons, neutrons, X-Rays, g-Rays, THz radiation etc. and thus offer a significant applications potential. In some areas it's fair to say they offer a possible capability that cannot be achieved with conventional non-laser based source technology. Certainly, driving high peak powers lasers with diode technology offers an efficient, compact and reliable route for such an applications environment to develop Thus, in addition to DiPOLE, I will touch on achievements in our development of the associated high peak power technology necessary for applications, highlighting our plans at RAL for their combination, and finally consider some of the downstream applications opportunities we are working on.
    Keywords: Power Lasers ; Semiconductor Lasers ; Laser Excitation ; Pump Lasers ; Laser Theory ; Laboratories
    Source: IEEE Conference Publications
    Source: IEEE Xplore
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  • 8
    Language: English
    In: Plasma and Fusion Research, 2013, Vol.8(0), pp.3404051-3404051
    Description: We present preliminary amplification results for DiPOLE, a prototype diode-pumped cryogenic gas cooled Yb:YAG amplifier. Amplification of ns-pulses at 1030 nm has demonstrated output energies of 10.1 J at 1 Hz in a 4-pass extraction geometry and 6.4 J at 10 Hz in a 3-pass setup, corresponding to optical-to-optical conversion efficiencies of 21% and 16%, respectively. Measured performance compares favourably to existing systems and confirms the viability of the concept for efficient generation of high energy pulses at multi-Hz repetition rate. Work is now underway to confirm the scalability of the concept with the design of a 100 J amplifier system. This along with advances in Ti:Sapphire amplifier technology opens the way to the development of a multi-Hz, PW-class laser facility at the Central Laser Facility. Knowledge gained from these developments will de-risk the technology necessary to build a sub-aperture beamlet for a laser driver suitable for fusion energy generation.
    Keywords: Solid-State Laser ; Laser Amplifier ; Pulsed Laser ; Ytterbium Laser ; Cryogenic Laser
    ISSN: 1880-6821
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  • 9
    Language: English
    In: 2017 IEEE High Power Diode Lasers and Systems Conference (HPD), October 2017, pp.19-20
    Description: We report on the successful demonstration of a 100J-level diode-pumped solid state laser (DPSSL) based on cryogenic gas cooled multi-slab ceramic Yb:YAG operating at 10 ns pulse duration and 10 Hz repetition rate. This result provides the first demonstration of a multi-Joule DPSSL delivering 1 kW average power and confirms the power scalability of multi-slab cryogenic gas-cooled amplifiers.
    Keywords: Cryogenics ; Pump Lasers ; Optical Fiber Amplifiers ; Solid Lasers ; Power Lasers ; Gas Lasers ; Laser Excitation ; Diode-Pumped Solid State Lasers ; High Energy Lasers ; High Average Power Lasers ; Laser Amplifiers ; Pulsed Lasers ; Ytterbium Lasers ; Applied Sciences
    ISBN: 9781538632628
    ISBN: 1538632624
    ISSN: 23790385
    E-ISSN: 23790393
    Source: IEEE Conference Publications
    Source: IEEE Xplore
    Source: IEEE Journals & Magazines 
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  • 10
    Language: English
    In: 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), June 2017, pp.1-1
    Description: Summary form only given. For over a decade, the development of high-energy diode pumped solid-state lasers (DPSSLs) has focused on scaling energy and increasing pulse repetition rate to unlock their potential for practical applications. These include new sources for industrial materials processing applications and as pump sources for higher repetition rate PW-class amplifiers, which can themselves generate high-brightness secondary radiation and ion sources leading to new remote imaging and medical applications. To meet this challenge, we have been developing a nanosecond pulsed DPSSL architecture at the Central Laser Facility, based on scalable, cryogenic, gas-cooled, multi-slab ceramic Yb:YAG amplifier technology, capable of operating at 10 Hz. Installation and commissioning of the first such 100 J-class system, DiPOLE100, has recently been completed at the HiLASE Centre in the Czech Republic, where its potential for industrial applications will be explored.
    Keywords: Laser Excitation ; Pump Lasers ; Cryogenics ; Semiconductor Lasers ; Gas Lasers ; Optical Amplifiers
    Source: IEEE Conference Publications
    Source: IEEE Xplore
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