Abstract
We report about a setup for carrier-envelope phase (CEP) control and stabilization in passive systems based on difference frequency generation (DFG). The principle of this approach relies on the amplitude to phase modulation transfer in the white-light generation process. A small modulation of the pump laser intensity is used to obtain a DFG output modulated in CEP. This technique is demonstrated in a CEP-stable system pumped by an Yb-doped fiber amplifier. It is first characterized by measuring CEP modulations produced by applying arbitrary waveforms. The CEP actuator is then used for slow drifts correction in a feedback loop. The results show the capability of this simple approach for OPA/OPCPA CEP-stabilized setups.
Highlights
Carrier-envelope phase (CEP) stabilization is an essential feature allowing access to complete control over the electric field generated by femtosecond lasers
We propose a CEP actuator for passively stabilized source architectures
Modulating the pump laser intensity allows to act on the CEP
Summary
Carrier-envelope phase (CEP) stabilization is an essential feature allowing access to complete control over the electric field generated by femtosecond lasers. A commonly and widely used approach is to detect fCEO at the oscillator output and modulate the pump laser intensity to stabilize it [10] Another technique denoted as feed-forward stabilization [6] consists in using the -1 diffraction order of an Acousto-Optic Frequency Shifter (AOFS) driven at the measured fCEO at the oscillator cavity output. Using this technique, CEP fluctuations lower than 30 mrad over 24 hours have been reported by Luecking et al [11]. A hybrid approach combining the feed-forward technique and a slow feedback loop has been proposed to overcome this limitation [12]
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