Femto Easy, ultrafast instrumentation


Based on Second Harmonic Generation, Fast FROG is reliable and compact. Key design features, such as the wavefront division technique and the use of our mini imaging spectrometer MISS, make the Fast FROG very easy to use and versatile while leading to accurate measurements. Six models are available, covering different pulse duration ranges from sub-5 fs to 10 ps, over a broad spectral range. Two designs are available: one for long pulses mainly relying on transmission optics, and one for ultrashort pulses which is fully achromatic.


  • Easy to use: no calibration and no tweaking necessary
  • User-friendly and powerful software (STAR : Software Technology for Acquisition and retrieval)
  • Can access Spatio-Temporal couplings (Spatial Chirp, Pulse Front Tilt)
  • Versatile: instant-swap of spectrometer for different wavelength ranges
  • Broad available spectral range (480 – 2100 nm)
  • Phase loop compatible with several pulse shaper for fast compression
  • Suitable for any repetition rate.
  • Single-pulse extraction possible up to 150 kHz laser repetition rate (with Enhanced detection option)
  • Sub-5 fs can be measured
  • Achromatic and non-dispersive (FC and FS models)
  • Fiber connector available (FC/APC, FC/PC)


Fast FROG models FC FS PS1 PS3 PS5 PS10
Pulse duration range min 4 fs 10 fs 50 fs 100 fs 150 fs 300 fs
max 150 fs 250 fs 1 ps 3.5 ps 5 ps 10 ps
Accessible spectral range (nm) 480 - 21001 800 - 21001
Spectral Window Δλ (nm) 580 1 420 1 300 1
Input pulse repetition rate single-shot to GHz2
Single-pulse measurement Up to 150 kHz laser repetition rate (with Enhanced detection option, or 40 kHz without)
Min input pulse energy 3 Single-shot 250 µJ 1 µJ 1 µJ
1 kHz 10 µJ 100 nJ 50 nJ
50 MHz 20 nJ 1 nJ 200 pJ
1 GHz n/a 50 pJ 25 pJ
Input polarization linear horizontal or vertical
Detection CMOS 12 Bits - 3 Mpx - 72 dB
PC Interface USB 3.1 (or GigE as an option)
Beam height (mm) 83 - 180
Dimensions (mm) 326 x 194 x 129

1 Effective spectral bandwidth to be defined within the accessible spectral range according to customer’s requirements. Additional spectrometers can be provided to address different spectral windows.

2 The measurements are averaged over several pulses for laser with repetition rate higher than 150 kHz.

3 Those values give an order of magnitude, with "low energy" option when applicable. The exact sensitivity depends on many parameters (pulse duration, beam profile, wavelength...)


Furthermore it is very user friendly, the Fast FROG software comes with an optimized retrieval algorithm, that allows you to retrieve time and spectral information in real time.
The image is a screenshot of the FROG software interface.

GigaHertz / low energy (pJ) measurement sample

FROG SEAM modelocked measurement example: 1.78 GHz rep. rate, 28 pJ per pulse, 50 mW avg. power
This is a FROG measurement performed with Fast FROG PS1 with a low energy option and small beam option.
The measured laser was a SESAM modelocked VECSEL developed at ETH Zurich1, assembled, amplified and CEO stabilized at the University of Neuchatel2.
This was the very first measurement of a GHz rep. rate Laser with a single-shot device.