Amplified Spontaneous Emission and Thermal Management on a High Average-Power Diode-Pumped Solid-State Laser – The Lucia Laser System

Abstract : The development of the laser triggered the birth of numerous fields in both scientific and industrial domains. High intensity laser pulses are a unique tool for light/matter interaction studies and applications. However, current flash-pumped glass-based systems are inherently limited in repetition-rate and efficiency. Development within recent years in the field of semiconductor lasers and gain media drew special attention to a new class of lasers, the so-called Diode Pumped Solid State Laser (DPSSL). DPSSLs are highly efficient lasers and are candidates of choice for compact, high average-power systems required for industrial applications but also as high-power pump sources for ultra-high intense lasers. The work described in this thesis takes place in the context of the 1 kilowatt average-power DPSSL program Lucia, currently under construction at the ‘Laboratoire d'Utilisation des Laser Intenses' (LULI) at the Ecole Polytechnique, France. Generation of sub-10 nanosecond long pulses with energies of up to 100 joules at repetition rates of 10 hertz are mainly limited by Amplified Spontaneous Emission (ASE) and thermal effects. These limitations are the central themes of this work. Their impact is discussed within the context of a first Lucia milestone, set around 10 joules. The developed laser system is shown in detail from the oscillator level to the end of the amplification line. A comprehensive discussion of the impact of ASE and thermal effects is completed by related experimental benchmarks. The validated models are used to predict the performances of the laser system, finally resulting in a first activation of the laser system at an energy level of 7 joules in a single-shot regime and 6.6 joules at repetition rates up to 2 hertz. Limitations and further scaling approaches are discussed, followed by an outlook for the further development.
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Submitted on : Wednesday, July 21, 2010 - 6:44:21 PM
Last modification on : Thursday, March 21, 2019 - 2:22:48 PM
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  • HAL Id : tel-00504915, version 1

Citation

Daniel Albach. Amplified Spontaneous Emission and Thermal Management on a High Average-Power Diode-Pumped Solid-State Laser – The Lucia Laser System. Atomic Physics [physics.atom-ph]. Ecole Polytechnique X, 2010. English. ⟨tel-00504915⟩

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