Multi-shot FROG

Multi-shot Frequency-resolved Optical Gating

The MS-FROG expands our FROG series and is preferably used when it comes to pulse energies in the pJ-nJ range or when particularly large pulse duration ranges need to be covered. e.g. 4 fs to 80 ps. The MS-FROG-SP measures both fs-ultrashort and long ps-pulses thanks to its resolution of 50 attoseconds in fine-scan mode. Our MS-FROG integrates in-house built spectrometers specifically developed for FROG measurements and guarantee high spectral resolution and the best performances for pulse characterization.

Easy to use
no calibration and no tweaking necessary


pJ/nJ energy pulses
for laser sources with very low pulse energy in the pJ and nJ range


Up to 50 attoseconds resolution
with fine scan mode, you combine extreme resolutions with large scan ranges

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

MS-FROG: The pulse explorer

The MS-FROG is unquestionably one of Femto Easy’s most versatile tool. The in-house designed high-resolution spectrometer ensure results with unprecedented scientific accuracy.

MS-FROG Frequency resolved optical gating by Femto Easy

From 4 fs to 80 ps

Short femtosecond pulse measurements combined with long picosecond ranges: MS-FROG from Femto Easy makes it now happen.

Convince yourself of the well thought-out design and operation


Further Key Features

  • Broad available spectral range (500 – 2100 nm)
  • Spectral Window Δλ from 200 – 700 nm
  • Versatile: instant-swap of spectrometer for different wavelength ranges
  • Sub-5 fs can be measured
  • 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.

 MS-FROGMS-FROG-SPMS-FROG-LPMS-FROG-SLP
Pulse duration min10 fs1 - 50 fs4 fs1 - 20 fs20 fs4 fs1 - 20 fs
Pulse duration max40 ps40 ps80 ps80 ps
Fine scan mode rangenot applicable4 - 100 fsnot applicable4 - 100 fs
Accessible spectral range (nm)500 - 21002
Spectral Window Δλ (nm)From 200 to 7002
Minimum temporal resolution1 fsstandard: 1 fs
fine scan: 50 as
2 fsstandard: 2 fs
fine scan: 50 as
Scan speed> 65 ps/sstandard : > 65 ps/s
fine scan: > 400 fs/s
> 130 ps/sstandard: > 130 ps/s
fine scan: > 400 fs/s
Input pulse repetition rate100 Hz to GHz3
Min input pulse energy4
1 MHz50 pJ10 nJ50 pJ10 nJ
100 MHz5 pJ1 nJ5 pJ1 nJ
Input polarizationlinear vertical
DetectionCMOS 12 Bits - 3 Mpx - 72 dB
PC InterfaceUSB 3.1
Beam height (mm)69 - 148
Dimensions (mm)326 x 194 x 129
1 With few cycle pulse extension option

2 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.

3 Low repetition rate available as an option

4 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

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.

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

Low repetition rate
Synchronization mode to be used when the laser repetition rate is low. Mandatory for 100 Hz and lower, recommended from below 500 Hz

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

Few cycle extension
Extension of the minimum pulse duration to the few cycle pulses range. Down to 10 fs for MS-FROG and down to 4 fs for MS-FROG-SP and MS-FROG-SLP


Software: FROG Acquisition and Retrieval with STAR

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

MS-FROG Frequency Software from Femto Easy

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 and 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 are 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).


FROG in the Lab

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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. Note: The video shows our Single-shot FROG system, however, the operation of the MS-FROG is similar to the Single-Shot FROG.