Determining the phase-energy coupling coefficient in carrier-envelope phase measurements

Abstract

For f-to-2f interferometers based on white-light generation in sapphire plates, the accuracy of the carrier-envelope (CE) phase measurement and stabilization is affected by the laser energy fluctuation. The coupling coefficient between the CE phase and the laser energy has been determined by modulating the pulse energy in an in-loop f-to-2f interferometer while measuring the CE phase variation with an out-loop interferometer. When the total spectral phase measured by the in-loop interferometer was locked, a 1% change in laser energy caused a 160 mrad shift in the CE phase of the output pulses.

High-speed carrier-envelope phase drift detection of amplified laser pulses

“…This coupling has been estimated in [20] to be around 160 mrad for every 1 per cent change in pulse energy for traditional f:2f interferometers based on white light generation in sapphire. A value of 120 mrad has been measured for a hollow fiber setup [21].…”

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

“…Although f-to-2f interferometers employing white light continuum generation are in commonpath configuration and therefore less sensitive to ambient noise, they still suffer from pulse energy to the measured CE phase coupling [31]. This coupling in the definite energy range can be close to linear, and thus a coupling coefficient can be measured.…”

Attosecond photon sources: the first decade and beyond [Invited]

“…As large as 160 mrad of error can be introduced by a 1% laser energy fluctuation [34,35]. Techniques for locking the laser power have been developed to reduce the CE phase measurement error [36].…”