Liquid-cooled Ti:Sapphire thin disk amplifiers for high average power 100-TW systems

Nagymihály, Roland S.; Cao, Huabao; Papp, D.; Hajas, Gergely; Kalashnikov, M.; Osvay, K.; Chvykov, V.

doi:10.1364/oe.25.006664

Cited by 22 publications

(11 citation statements)

References 20 publications

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“…The combination of EDP technique with TD Ti:Sa crystals for power amplifiers [39,41,43] also lets the ultra-high peak power amplifiers increase as well as the average power. In a proofof-principle experiment, high-energy broadband amplification in a room temperature watercooled EDP-TD head was demonstrated at a 10 Hz repetition rate instead of performing a traditional cryogenically cooled multipass scheme.…”

Section: Resultsmentioning

confidence: 99%

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New Generation of Ultra-High Peak and Average Power Laser Systems

Chvykov¹

2018

High Power Laser Systems

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Ultra-high peak power laser systems are applicable in new and very promising areas, such as charged particles acceleration and inertial confinement of the fusion nuclear reaction. First one could be used as effective secondary source of Y and X-ray beams, which have multiple applications in industry and medicine if repetition rate will be increased, the last one could serve as a source of unlimited energy after transforming in to the power plants. New technologies are able to significantly increase the output peak power due to extraction of the higher energy extracting during pumping (EDP). The record of extracted energy about 200 J and output power of 5 PW were reached with this technique. Polarization Encoded Chirped Pulse Amplification (PE-CPA) technique as well as two stages of compression produced shorter pulse duration also are presented in this chapter. Besides, the capability of combination of the EDP method and the Thin Disk (EDP-TD) applied to Ti:Sa amplifiers to produce the higher repetition rate in the PW-class laser systems, as well as the results of the proof-of-principal experiments will be demonstrated.

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Section: Resultsmentioning

confidence: 99%

“…Numerical modeling of scaling larger peak power amplifier modules with double channel cooling and double crystals (three cooling channels) design were also conducted in Ref. [43].…”

Section: High Power Laser Systemsmentioning

confidence: 99%

New Generation of Ultra-High Peak and Average Power Laser Systems

Chvykov¹

2018

High Power Laser Systems

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“…Thermal load issues were addressed by means of water cooling at near room temperature of the end surfaces of the amplification crystals, shaped as disks with a relatively large diameter to thickness ratio, as recently proposed [13]. Alternative approaches were considered, such as the cooling of the crystals by means of a high speed gas flow at cryogenic temperatures, as implemented in the DIPOLE Yb:YAG high energy laser system [14,15], or more recently in the Ti:Sapphire high energy amplifier implemented in the ELI-HAPLS system [16].…”

Section: Power Amplificationmentioning

confidence: 99%

“…In the transmission geometry, the disk-shaped crystal is cooled on both faces; both the pump beams and the amplified beam cross the crystal, the cooling water flow, and the flow containment windows. This solution (proposed in a previous study [13] and analyzed in another study [6] for the Eupraxia system) offers a good performance in terms of heat extraction and allows implementation of a simpler layout from a geometrical point of view, but it presents a potential drawback because the amplified beam is potentially subjected to optical perturbations due to the turbulence of the cooling fluid.…”

Section: Ti:sapphire Amplifiers Structure and Geometrymentioning

confidence: 99%

Conceptual Design of a Laser Driver for a Plasma Accelerator User Facility

et al. 2019

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The purpose of the European project EuPRAXIA is to realize a novel plasma accelerator user facility. The laser driven approach sets requirements for a very high performance level for the laser system: pulse peak power in the petawatt range, pulse repetition rate of several tens of Hz, very high beam quality and overall stability of the system parameters, along with 24/7 operation availability for experiments. Only a few years ago these performances were considered unrealistic, but recent advances in laser technologies, in particular in the chirped pulse amplification (CPA) of ultrashort pulses and in high energy, high repetition rate pump lasers have changed this scenario. This paper discusses the conceptual design and the overall architecture of a laser system operating as the driver of a plasma acceleration facility for different applications. The laser consists of a multi-stage amplification chain based CPA Ti:Sapphire, using frequency doubled, diode laser pumped Nd or Yb solid state lasers as pump sources. Specific aspects related to the cooling strategy of the main amplifiers, the operation of pulse compressors at high average power, and the beam pointing diagnostics are addressed in detail.Laser Accelerator) [4], with an average power output of tens of watts. New systems under realization aim to even higher average power levels, such as HAPLS targeting an output power of 300 W. Nonetheless, to address user-level requirements, the average power of ultrafast lasers needs to increase by one or two orders of magnitude.The purpose of the European project EuPRAXIA [5] is to provide a conceptual design for a compact, user-oriented, plasma accelerator with superior beam quality to enable free electron laser operation in the X-ray range. User requirements for an operational facility imply a significant increase of the laser driver output parameters with respect to systems currently available or under development: pulse peak power in the petawatt range, pulse repetition rate of several tens of Hz, as well as very high beam quality and overall stability of the system parameters.A description of the architecture of the laser driver was already published in previous work [6], describing the main parameters and technical solutions. This paper complements the previous one by recalling the general lines of the system architecture and addressing some specific points that are particularly critical for the system operation at high average power levels. These aspects are related to the amplifier's geometrical layout, the cooling solution to address the operation at high average power levels, and the laser beam transport-related issues.

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“…We envisage two cooling techniques for the Ti:Sapphire crystal, namely cooling with water flow and cooling with He flow at cryogenic temperatures. Water cooling of thin Ti:Sapphire crystal disks has been recently tested on a small scale system [Cvykow 2016] and scaling up to kW levels have been studied Nagymihaly et al [Nagymihaly 2017]. Thin disk (TD) technology may offer the possibility for Ti:Sa crystals to be used in high average output power systems because the longitudinal direction of heat extraction greatly reduces thermal lensing; scalability can be obtained by segmenting the required crystal length in thinner slices, each one individually cooled.…”

Section: Thermal Managementmentioning

confidence: 99%

A viable laser driver for a user plasma accelerator

Gizzi

Koester

Labate

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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The construction of a novel user facility employing laser-driven plasma acceleration with superior beam quality will require an industrial grade, high repetition rate petawatt laser driver which is beyond existing technology. However, with the ongoing fast development of chirped pulse amplification and high average power laser technology, options can be identified depending on the envisioned laser-plasma acceleration scheme and on the time scale for construction. Here we discuss laser requirements for the EuPRAXIA infrastructure design and identify a suitable laser concepts that is likely to fulfil such requirements with a moderate development of existing technologies.

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Liquid-cooled Ti:Sapphire thin disk amplifiers for high average power 100-TW systems

Cited by 22 publications

References 20 publications

New Generation of Ultra-High Peak and Average Power Laser Systems

New Generation of Ultra-High Peak and Average Power Laser Systems

Conceptual Design of a Laser Driver for a Plasma Accelerator User Facility

A viable laser driver for a user plasma accelerator

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