Compact single-shot CEP-meter

UFI’s single-shot phasemeter facilitates single-shot measurements of the carrier-envelope-phase (CEP) of few-cycle femtosecond laser pulses. The ability to characterize the CEP of few-cycle pulses is the backbone of attosecond metrology and key to achieving sub-cycle temporal resolution in a broad range of ultrafast laser applications. Unlike its predecessor, our new device does not require high vacuum or multichannel plates, which guarantees simple and user-friendly operation. MADEIRA supports center wavelengths ranging from the visible to the near-infrared domain, and operates at a repetition rate of up to 10 kHz.

MADEIRA relies on the detection of the light-induced, CEP-dependent current. The current is generated via strong-field ionization of gas-phase ethanol in the focus of the laser pulse and is probed by a pair of electrodes placed on either side of the focus.
The current flowing between the two electrodes is amplified and converted into a voltage output signal. A second output signal is obtained from a similar measurement of a phase-shifted copy of the pulse in a second focus. The CEP is retrieved from the two output signals, which can be acquired continuously without time limitation.

Key Product Features

  • Wavelength range: 500-1000 nm
  • Pulse duration: <=4.5fs @750 nm central wavelength
  • Input polarization: linear, p-pol
  • Input pulse energy: 10-40 uJ, best performance at 30 uJ
  • Repetition rate: 10 kHz
  • Footprint: 35 x 30 cm2
  • Phase resolution: down to 200 mrad


[1] The circular-polarization phase-meter
B. Bergues
Optics Express 20, 25317 (2012)

[2] Single-shot carrier–envelope-phase measurement in ambient air
M. Kubullek, Z. Wang, K. von der Brelje, D. Zimin, P. Rosenberger, J. Schötz, M. Neuhaus, S. Sederberg, A. Staudte, N. Karpowicz, M. F. Kling, and B. Bergues
Optica 7, 35 (2020)

[3] The emergence of macroscopic currents in photoconductive sampling of optical fields
J. Schötz, A. Maliakkal, J. Blöchl, D. Zimin, Z. Wang, P. Rosenberger, M. Alharbi, A. Azzeer, M. Weidman, V. Yakovlev, B. Bergues, M. Kling
Nature Communications 13, 962 (2022)