Knut Michel
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View article: Laser-guided lightning
Laser-guided lightning Open
Electric currents circulating between charged clouds and the earth surface during lightning discharges are responsible for considerable damages and casualties. It is therefore important to develop better protection methods in addition to t…
View article: Second and third harmonic generation from simultaneous high peak- and high average-power thin disk laser
Second and third harmonic generation from simultaneous high peak- and high average-power thin disk laser Open
We report Second Harmonic Generation (SHG) and Third Harmonic Generation (THG) energy conversion efficiencies up to 59% and 27%, respectively for laser pulses simultaneously delivering high peak power in the sub-TW range and average powers…
View article: Laser lightning rod and artificial fog dissipation
Laser lightning rod and artificial fog dissipation Open
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View article: The laser lightning rod project
The laser lightning rod project Open
Lightning is highly destructive due to its high power density and unpredictable character. Directing lightning away would allow to protect sensitive sites from its direct and indirect impacts (electromagnetic perturbations). Up to now, las…
View article: Ultrafast thin-disk multipass amplifier with 720 mJ operating at kilohertz repetition rate for applications in atmospheric research
Ultrafast thin-disk multipass amplifier with 720 mJ operating at kilohertz repetition rate for applications in atmospheric research Open
We present an ultrafast thin-disk based multipass amplifier operating at a wavelength of 1030 nm, designed for atmospheric research in the framework of the Laser Lightning Rod project. The CPA system delivers a pulse energy of 720 mJ and a…
View article: Active pump-seed-pulse synchronization for OPCPA with sub-2-fs residual timing jitter: erratum
Active pump-seed-pulse synchronization for OPCPA with sub-2-fs residual timing jitter: erratum Open
In the original manuscript, a residual RMS timing jitter below 2 fs between pump and seed pulses in the stabilized case was claimed.Following a reevaluation of the data, this was underestimated.Due to a rounding error in the calibration ro…
View article: Thin-disk pumped optical parametric chirped pulse amplifier delivering CEP-stable multi-mJ few-cycle pulses at 6 kHz
Thin-disk pumped optical parametric chirped pulse amplifier delivering CEP-stable multi-mJ few-cycle pulses at 6 kHz Open
We present an optical parametric chirped pulse amplifier (OPCPA) delivering CEP-stable ultrashort pulses with 7 fs, high energies of more than 1.8 mJ and high average output power exceeding 10 W at a repetition rate of 6 kHz. The system is…
View article: Highly-stable, High-power Picosecond Laser Optically Synchronized to a UV Photocathode Laser for an ICS Hard X-ray Generation
Highly-stable, High-power Picosecond Laser Optically Synchronized to a UV Photocathode Laser for an ICS Hard X-ray Generation Open
Under the CXLS project at Arizona State University we are developing an inverse Compton scattering (ICS) hard X-ray source* towards a compact XFEL with electron nano-bunching. The ICS interaction is critically dependent on the quality of d…
View article: Dual-scale turbulence in filamenting laser beams at high average power
Dual-scale turbulence in filamenting laser beams at high average power Open
We investigate the self-induced turbulence of high repetition rate laser\nfilaments over a wide range of average powers (1 mW to 100 W) and its\nsensitivity to external atmospheric turbulence. Although both\nexternally-imposed and self-gen…
View article: Study of filamentation with a high power high repetition rate ps laser at 103 µm
Study of filamentation with a high power high repetition rate ps laser at 103 µm Open
We study the propagation of intense, high repetition rate laser pulses of picosecond duration at 1.03 µm central wavelength through air. Evidence of filamentation is obtained from measurements of the beam profile as a function of distance,…
View article: High repetition rate ultrashort laser cuts a path through fog
High repetition rate ultrashort laser cuts a path through fog Open
We experimentally demonstrate that the transmission of a 1030~nm, 1.3~ps laser beam of 100 mJ energy through fog increases when its repetition rate increases to the kHz range. Due to the efficient energy deposition by the laser filaments i…