Single-shot Fast FROG

Single-shot Frequency-resolved Optical Gating

Fast FROG is reliable, compact and based on Second Harmonic Generation. 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 designed to be fully achromatic.

Easy to use
no calibration and no tweaking necessary

Single-pulse extraction up to 150 kHz laser repetition rate

accurate results on fs-ultra-short pulses and ps-pulses

Proprietary hot-swap spectrometers
tailored to specific requirements (not limited by 3rd-party models), easily swappable for different wavelength ranges

Powerful FROG software
STAR: Software Technology for Acquisition and Retrieval


Fast FROG is very convinient to use and versatile. The internal high-resolution spectrometer produces measurement results with unprecedented scientific accuracy.

Shot-to-Shot Pulse Measurement

Live extraction of shot-to-shot pulses: temporal profile intensity and phase, fundamental spectrum and phase, chirp, third-order dispersion, pulse duration. 

High performance

Further Key Features

  • Broad available spectral range (480 – 2100 nm)
  • Versatile: instant-swap of spectrometer for different wavelength ranges
  • 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)

Technical Specification

Femto Easy’s Fast FROG comes with a user-friendly and powerful software at no additional costs. Compare the technical specifications and discover your favorite model.

Pulse duration min4 fs10 fs50 fs70 fs150 fs300 fs
Pulse duration max150 fs250 fs1 ps3 ps5 ps10 ps
Accessible spectral range (nm)1480 - 2100480 - 2100480 - 2100480 - 2100480 - 2100800 - 2100
Spectral Window Δλ (nm)1580420300300300300
Input pulse repetition ratesingle-shot to GHz2
Single-pulse measurementUp to 150 kHz laser repetition rate (with Enhanced detection option, or 40 kHz without)
Min input pulse energy3
Single-shot250 µJ1 µJ1 µJ1 µJ1 µJ1 µJ
1 kHz10 µJ100 nJ50 nJ50 nJ50 nJ50 nJ
50 MHz20 nJ1 nJ200 pJ200 pJ200 pJ200 pJ
1 GHzn/a50 pJ25 pJ25 pJ25 pJ25 pJ
Input polarizationlinear vertical
DetectionCMOS 12 Bits - 3 Mpx - 72 dB
PC InterfaceUSB 3.1 (or GigE as an option)
Beam height (mm)69 - 148
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 80 k

3 Values give an order of magnitude. The exact sensitivity depends on many parameters (pulse duration, beam profile, wavelength...)

Optional Features

Additional crystals
The default Fast FROG configuration includes one crystal. To extend the wavelength range of the device, additional plug&play crystals can be ordered and swapped within the system in seconds

Additional MISS spectrometer
The default Fast FROG configuration includes one imaging spectrometer MISS. To extend the wavelength range of the device, additional plug&play MISS spectrometers can be ordered and swapped within the system in seconds

Enhanced detection
Replacement of the default camera embedded in the Fast FROG by a higher performance one to increase the specifications of the system (better temporal resolution and spectral resolution, single pulse extraction up to 150 kHz)

Fiber input connector
Plug&play collimation module with fiber connector. Can be mounted on the Fast FROG to easily switch the input from free-space to fiber. No alignment required.

High dynamic range
Software mode to increase the dynamic range of the Fast FROG signal acquisition from 12 to 16 bits. Not compatible with pure single-shot measurements as 2 images are necessary to build one FROG trace

Low energy
Internal module to increase the sensitivity of the Fast FROG when the laser power is too weak

Phase loop
Software mode to use the Fast FROG to perform spectral phase feedback loop with a pulse shaper (contact use to check pulse shaper compatibility)

Phase matching
Default Fast FROG configuration works for a given central wavelength. Phase matching allows tuning the SHG crystal to measure different central wavelengths with the best SNR

Pulse Front Tilt / Spatial Chirp
Measurement of spatio-temporal couplings in the software. Correction of FROG trace accordingly for better accuracy of the retrieval

Small beam
Internal module to increase the input beam diameter when it is too small for the Fast FROG (necessary for beams typically in the range of few mm or less)

Synchronization of the Fast FROG detection to an external signal for accurate laser single pulse extraction up to 80 kHz (150 kHz with the Enhanced detection option)

Fast FROG Retrieval Software

Intuitive acquisition and calculation tab of the Fast FROG retrieval software.

Retrieval software FROG frequency

The retrieval of the ultrashort-pulse from the FROG trace image is managed by our easy-to-use FROG software. Fast FROG software comes with an optimized retrieval algorithm.  It allows you to retrieve time and spectral information in real-time.

Several algorithms (including the so called Ptychographic Iterative Engine) are combined to enhance the reconstruction speed and quality.

Thanks to speed, the live extraction of shot-to-shot pulse properties is achieved, such as temporal profile intensity and phase, fundamental spectrum and phase, pulse chirp, third-order dispersion, and, of course, pulse duration (FWHM, autocorrelation FWHM, Fourier-limited pulse duration).

The very first measurement of a GHz Laser with single-shot FROG

Gigahertz & low energy (pJ) FROG

GHz FROG Frequency Measurement

FROG SEAM modelocked measurement: 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 in order to explore power limitations due to multi-pulse behavior.

Single-Shot FROG in the Lab


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Single-shot FROG made easy

Our engineers employ the latest technologies and frameworks to create FROG solutions that combine a strong easy-to-use experience with high scientific performance.