Arunas Varanavicius

Three dimensional imaging of short pulses

Abstract We exploit a slightly non-collinear second-harmonic cross-correlation scheme to map the 3D space–time intensity distribution of an unknown complex-shaped ultrashort optical pulse, down to a resolution of 10 μm in space and 200 fs in time. Moreover, we directly show that the spatial phase information is not lost in the process, thanks to the coherence of the non-linear interaction. This implies that the concept of second-harmonic holography can be employed down to the sub-picosecond time scale, and used to discuss the features of the technique in terms of the reconstructed fields.

Red solitons: Evidence of spatiotemporal instability in Χ(2) spatial soliton dynamics

In chi(2) three-wave mixing, the noise-seeded spatiotemporal modulational instability has a dramatic impact on the spatial soliton formation and on their stability, leading to the occurrence of a temporal breakup on the 20 fs scale and to the counterintuitive observation of spatial solitons with no apparent participation of the high-frequency field in the self-trapping.

Solitonic all-optical switch based on the fractional Talbot effect

A periodic pattern of hundreds of beams is shifted by half its transverse period as the result of excitation of parametric spatial solitons and the fractional Talbot effect. The all-optical switch that is obtained operates with 1-ps pulses.

Few cycle, CEP stabilized, high contrast OPCPA system with 5.5 TW peak power and 53W average power

Optical parametric chirped pulse amplification (OPCPA) is widely recognized as a key technique for producing intense few-cycle light pulses for attosecond science [1]. Owing to the continuous improvement of diode-pumped solid state (DPSS) lasers, the OPCPA technique is becoming ever more attractive as combining DPSS laser pump sources and OPCPA enables simultaneous scaling of peak and average power of few-cycle pulse trains. In this contribution, we present a table-top OPCPA system driven by diode-pumped Yb:KGW and Nd:YAG lasers, delivering ∼3 cycle, CEP stabilized pulses with >53mJ energy at 1 kHz repetition rate, corresponding to >5.5 TW peak power and >53 W average power. To the best of our knowledge, this is currently the highest average power produced by a few cycle, TW-class OPCPA system.

Continuum seeded OPCPA system driven by tandem fs Yb:KGW and ps Nd:YAG lasers

We present a compact TW-class continuum seeded multistage OPCPA system operated at 800 nm and pumped by femtosecond and picosecond pulses. 35 mJ pulse energies and compression to 9 fs are demonstarated.

Direct carrier-envelope phase control of a sub-MHz Yb amplifier

We demonstrate direct feed-forward CEP control of a regenerative amplifier in a single stage, resulting in unprecedented sub-100 mrad phase jitters of an amplified system. Energy scalability of the approach is shown.

Direct Carrier-Envelope Phase Control of a sub-MHz Yb amplifier

We demonstrate direct feed-forward CEP control of a regenerative amplifier in a single stage, resulting in unprecedented sub-100 mrad phase jitters of an amplified system. Energy scalability of the approach is shown.

Spatial chirp and angular dispersion dynamics in femtosecond noncollinear OPCPA

We present the results of theoretical, numerical and experimental study on transformation of chirped pulse spatio-temporal characteristics, when pump and signal pulse fronts are not matched during the amplification in noncollinear optical parametric chirped-pulse amplifier.