Towards adaptive high-power lasers: Model-based control and disturbance compensation using moving horizon estimators

Schmidt, Kristina; Beirow, Frieder; Böhm, Michael; Graf, Thomas; Ahmed, Marwan Abdou; Sawodny, Oliver

doi:10.1016/j.mechatronics.2020.102441

Cited by 9 publications

(6 citation statements)

References 19 publications

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“…Building on the mathematical model derived in the previous section, we now want to find a suitable input subject to the constraints (18) such that the amplifier delivers output pulse bursts with the desired burst envelope, that is, the desired distribution of the total energy into the individual pulses, when operated at steady state.…”

Section: Optimization-based Input Shapingmentioning

confidence: 99%

“…Since sufficiently fast input filters are widely available and modern laser amplifiers already use computerized control for timing, the application of methods from automatic control and adaptive optics [12,13] is highly desirable. To this end, system and control theory has been employed for different tasks such as dynamic analysis [14], pulse and beam shaping [15][16][17][18] as well as feedback stabilization [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Control of the formation and amplification of pulse bursts in regenerative amplifiers

Deutschmann‐Olek

Schrom

Kugi

2022

IET Control Theory & Appl

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This paper presents control strategies to generate bursts of high‐intensity laser pulses with arbitrary envelope from regenerative amplifiers by suitably adjusting the energy of the injected seed pulses. To this end, existing and experimentally validated models are generalized to obtain a dynamical model of the pulse formation and amplification. The resulting model is applicable to standard regenerative amplifiers as well as amplifiers with a detuned cavity specifically designed for the generation of pulse bursts. Utilizing this mathematical model, an optimization‐based algorithm to obtain desired pulse bursts in steady state is presented. Since the quality of these feedforward solutions is limited due to parameter variations and model imprecisions, an adaptation scheme using iterative learning control methods is employed to track the desired burst envelope. Finally, the developed methods are combined with feedback strategies to allow for an operation in unstable regimes and the closed‐loop behaviour is illustrated by simulation scenarios.

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Section: Optimization-based Input Shapingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control of the formation and amplification of pulse bursts in regenerative amplifiers

Deutschmann‐Olek

Schrom

Kugi

2022

IET Control Theory & Appl

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“…By applying a positive pneumatic pressure on the backside of the SDM, the RoC could be tuned from −3 m (corresponding to a stroke of 10.7 µm) to approximately −50 m, as shown in figure 2. Further details on the dynamic behaviour of the SDM can be found in [9,10]. A CCD-camera recorded the beam leaked through the plane HR folding mirror as shown in red in figure 1.…”

Section: Experimental Setup and Resonator Designmentioning

confidence: 99%

“…To this end, the beam radius measured at the plane of the thin disk (r measured ) was fed to the control system to calculate the difference between the setpoint (desired beam radius at the thin disk, r set ) and the actual beam radius. The control system [10] minimized this error by adjusting the pressure applied to the SDM, to change its RoC.…”

Section: Experimental Setup and Resonator Designmentioning

confidence: 99%

Closed-loop controlled compensation of thermal lensing in high-power thin-disk lasers using spherically deformable mirrors

et al. 2021

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We present the closed-loop controlled compensation of the thermally induced lens in a high-power thin-disk oscillator to obtain fundamental-mode operation over a wide range of pump powers. The radius of the oscillating beam was measured in real time at the position of the thin-disk crystal. This signal was used by the control system to adapt the curvature of a spherically deformable mirror to maintain a constant radius of the oscillating laser beam.

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“…The paper [7] discusses another application of lasers, in this case high-power lasers that are typically used in material processing (welding, cutting). The authors study the rejection of thermally-induced disturbances, which frequently limit the beam quality of high-power lasers.…”

mentioning

confidence: 99%

Introduction to the virtual special issue from the IFAC Symposium on Mechatronic Systems 2019

et al. 2021

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Towards adaptive high-power lasers: Model-based control and disturbance compensation using moving horizon estimators

Cited by 9 publications

References 19 publications

Control of the formation and amplification of pulse bursts in regenerative amplifiers

Control of the formation and amplification of pulse bursts in regenerative amplifiers

Closed-loop controlled compensation of thermal lensing in high-power thin-disk lasers using spherically deformable mirrors

Introduction to the virtual special issue from the IFAC Symposium on Mechatronic Systems 2019

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