Thomas Hornung

Diffraction-based femtosecond pulse shaping with a two-dimensional spatial light modulator

A new diffraction-based method is proposed and demonstrated for simultaneous shaping of both the phase and amplitude of femtosecond laser pulses by use of a phase-only two-dimensional spatial light modulator. The method suppresses certain types of temporal replica features ordinarily observed in femtosecond pulse shaping owing to imperfections in modulator devices and allows for multiplexed outputs suitable for use in various applications.

Degenerate four-wave mixing spectroscopy based on two-dimensional femtosecond pulse shaping.

We report noncollinear, degenerate four-wave mixing experiments that employ a new device based on two-dimensional femtosecond pulse shaping that delays and modulates all incident fields. Heterodyne detection is easily implemented due to the full phase stability of the device.

Typesetting of terahertz waveforms

We demonstrate programmable generation of temporally shaped terahertz waveforms in LiNbO3 by spatially shaping the beam profile of femtosecond excitation laser pulses with a spatial light modulator. The generated terahertz waveforms have amplitudes that are approximately proportional to the first spatial derivative of the excitation beam profile.

Terahertz polaritonics: High-field THz coherent control and spectroscopy

The tools of THz polaritonics are extended for improved polariton amplification and for nonlinear THz spectroscopy using amplified and focused polariton waveforms. THz coherent spectroscopy and control applications are enabled

Coherently Controlled Multidimensional Optical Spectroscopy

Multidimensional optical spectroscopy of potassium dimer is demonstrated using a 2D femtosecond pulse shaper with excellent phase stability. Coherent control of intramolecular dynamics is achieved by introducing specific pulse sequences and chirps.

Degenerate four-wave mixing spectroscopy based on two dimensional pulse shaping

Degenerate, noncollinear, optically heterodyned, spectrally resolved, multidimensional femtosecond χ(3) measurements are executed with waveforms, delays, and spectral phases and amplitudes of all fields controlled by a single active device in a fully phase matched beam geometry.

Typesetting THz Waveforms

We demonstrate temporal-shaping of THz waveforms in LiNbO3 by spatially shaping femtosecond excitation pulses with a spatial-light modulator. The generated THz waveforms are approximately proportional to the first spatial derivative of the excitation beam profile.