Carrier-envelope phase control of Yb:KGW laser and parametric amplifiers

Abstract

In this paper we present the most recent results on the optimization of the carrier-envelope phase (CEP) stabilization of a Yb:KGW laser system and parametric amplifiers. The implementation of several CEP locking techniques and their combinations allowed us to reduce the RMS phase noise of the oscillator to the values below 100 mrad and demonstrate the operation of the whole laser system with the CEP jitter of 170 mrad. The active and passive CEP stabilization for parametric amplifiers was tested. The operation of optical parametric amplifiers in the passive CEP stabilization regime with an additional slow feedback loop providing the CEP jitter as low as 70 mrad over 6 hours was demonstrated.

10 W CEP-stable few-cycle source at 2 µm with 100 kHz repetition rate

“…Without piezo mirror stabilization, 103 mrad fluctuations over 15 seconds were measured. Some of these fluctuations might be measurement artefacts as fluctuations in laser power and beam pointing can couple to the measured CEP [31,32] due to position variations of the filament in SCG in the f-2f interferometer.…”

Binary‐weighted photonic digital‐to‐analogue converter

“…In this scheme, the two optical digital input signals P Bit 2 and P Bit 1 represent the MSB and LSB bits power with identical magnitude. The LSB powerP Bit 1 is attenuated by 6 dB and added to the power of the MSB, P Bit 2 after passing through a delay block that imposes a delay of T d seconds that matches the propagation delay of the attenuator block so the two input pulses are added in-phase, the phase matching of the corresponding optical signals could be performed by other methods using a non-linear medium [15][16][17]. A directional coupler is used as the optical adder.…”