FROG Systems | Ultrafast Laser Characterization

Time to measurement

<2 min - No calibration needed

Spectral Range

480 – 2100 nm

Repetition rate

Any rate, single-shot up to 150k Hz

Min pulse width

Sub 5 fs

Versatile

Instant-swap of spectrometer for different wavelength ranges

Spatio-temporal coupling measurement

Spatial Chirp, Pulse Front Tilt

FemtoEasy FROG System for Ultrafast Laser Characterization

FROG stands for Frequency-resolved Optical Gating. A FROG system is an instrument for complete characterization of ultrashort pulses, thus it can retrieve the full time-dependent electric field, and the equivalent optical spectrum with spectral phase. In other words, FROG allows you to know the duration of your pulses, but also how to deal with spectral phase to reach the shortest possible duration.

We offer two types of FROG from FemtoEasy:

The Fast FROG is a single-shot FROG System, thus it needs one single pulse to measure the duration. Its innovative algorithm allow a real-time pulse retrieval.
The MS-FROG is a multi-shot FROG System. It uses an optical delay line to scan the delay, and each pulse allows to know the intensity for a particular delay. It can measure pulses with energy as low as 50 pJ. The same device can measure very short pulses and longn pulses, from 5 fs to 80 ps!

Single-Shot FROG

Based on Second Harmonic Generation, Fast/Single-Shot 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. Seven 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.

Multi-Shot FROG

MS-FROG stands for Multi-Shot Frequency Resolved Optical Gating. The MS-FROG is based on second harmonic generation, making it reliable and compact. It has been specially developed for sources with energy per pulse of less than 1 nJ. It allows the measurement of pulses from 50 fs to 40 ps in the standard version. The scan speed is so high that it allows real-time operations for measurement and optimization. The MS-FROG-LP can perform scan at 130 ps/s, making it the fastest scanning FROG on the market. Also, the MS-FROG-SP allows the measurement of both ultra-short and long pulses thanks to its dual-mode (standard mode for pulse duration >=> 50 fs and fine-scan mode for pulse < 50 fs). On top of that, our recently developed algorithm allows to extract information from each recorded spectra instantaneously, leading to real time reconstruction of your pulses! Like every products, the MS-FROG is easy to install and use.

Advantages of Femto Easy FROG systems over competitive technologies

No moving parts (single-shot FROG)
Broad available spectral range (480 – 2100 nm)
Can work for both single-shot and low-repetition rate and high-repetition rate applications (single-shot FROG)
Very sensitive, measurements performed with mW level lasers at 100 MHz (multi-shot FROG)
Compact and robust
Easy to align
Spectrometers manufactured by Femto Easy (no need to rely on third parties)
Full wavelength flexibility by just swapping spectrometers
Proprietary FROG algorithm for quick and accurate retrieval of even complex pulses
Can work with both compressed and highly chirped pulses
For more information, check out our ultrafast laser measurement application page.

How to choose between single-shot and multi-shot FROG?
	Single-shot	Multi-shot
Model type	Single-shot	Accumulated multi-shot
Use case	Single-pulse measurement, shot-to-shot measurement	Extremely low energy pulses down to 5 pJ
Real time phase retrieval	✔️
Min pulse duration	4 fs	4 fs
Max pulse duration	10 ps	80 ps
Input repetition rate	Single-shot to GHz	100 Hz to GHz
Spectral range	480 - 2100 nm	500 - 2100 nm
Spectral window	300 - 540 nm	200 - 700 nm

Single-Shot/Fast (Fast-FROG)
Model	FC	FS10	FS20	PS1	PS3	PS5	PS10
Pulse duration min	4 fs	10 fs	20 fs	50 fs	70 fs	150 fs	300 fs
Pulse duration max	150 fs	250 fs	500 fs	1 ps	3 ps	5 ps	10 ps
Accessible spectral range (nm)*	480 - 2100	480 - 2100	480 - 2100	480 - 2100	480 - 2100	480 - 2100	800 - 2100
Spectral Window Δλ (nm)*	580	420	420	300	300	300	300
Input pulse repetition rate	single-shot to GHz**	single-shot to GHz**	single-shot to GHz**	single-shot to GHz**	single-shot to GHz**	single-shot to GHz**	single-shot to GHz**
Single-pulse measurement **	Up to 40kHz (150kHz w/ option)	Up to 40kHz (150kHz w/ option)	Up to 40kHz (150kHz w/ option)	Up to 40kHz (150kHz w/ option)	Up to 40kHz (150kHz w/ option)	Up to 40kHz (150kHz w/ option)	Up to 40kHz (150kHz w/ option)
Min input pulse energy - Single-shot***	250 µJ	1 µJ	1 µJ	1 µJ	1 µJ	1 µJ	1 µJ
Min input pulse energy @ 1 kHz	10 µJ	100 nJ	100 nJ	50 nJ	50 nJ	50 nJ	50 nJ
Min input pulse energy @ 50 MHz	20 nJ	1 nJ	1 nJ	200 pJ	200 pJ	200 pJ	200 pJ
Min input pulse energy @ 1 GHz	N/A	50 pJ	50 pJ	25 pJ	25 pJ	25 pJ	25 pJ
Input polarization	linear vertical	linear vertical	linear vertical	linear vertical	linear vertical	linear vertical	linear vertical
Detection	CMOS 12 Bits - 3 Mpx - 72 dB	CMOS 12 Bits - 3 Mpx - 72 dB	CMOS 12 Bits - 3 Mpx - 72 dB	CMOS 12 Bits - 3 Mpx - 72 dB	CMOS 12 Bits - 3 Mpx - 72 dB	CMOS 12 Bits - 3 Mpx - 72 dB	CMOS 12 Bits - 3 Mpx - 72 dB
PC interface	USB 3.1	USB 3.1	USB 3.1	USB 3.1	USB 3.1	USB 3.1	USB 3.1
Beam height (mm)	69 - 148	69 - 148	69 - 148	69 - 148	69 - 148	69 - 148	69 - 148
Dimensions (mm)	326 x 194 x 129	326 x 194 x 129	326 x 194 x 129	326 x 194 x 129	326 x 194 x 129	326 x 194 x 129	326 x 194 x 129

Multi-Shot (MS-FROG)

	MS-FROG	MS-FROG-SP	MS-FROG-LP	MS-FROG-SLP
Pulse duration min	10 fs - 50 fs	4 fs - 20 fs	20 fs	4 fs - 20 fs
Pulse duration max	40 ps	40 ps	80 ps	80 ps
Fine scan mode range	N/A	4 - 100 fs	N/A	4 - 100 fs
Accessible spectral range (nm)	500 - 2100	500 - 2100	500 - 2100	500 - 2100
Spectral Window Δλ (nm)	200 to 700	200 to 700	200 to 700	200 to 700
Minimum temp res	1 fs	standard: 1 fs, fine scan: 50 as	2 fs	standard: 2 fs, fine scan: 50 as
Scan speed	> 65 ps/s	standard : > 65 ps/s, fine scan: > 400 fs/s	> 130 ps/s	standard : > 130 ps/s fine scan: > 400 fs/s
Input pulse repetition rate		100 Hz to GHz	100 Hz to GHz	100 Hz to GHz
Min pulse energy @ 1 MHz	50 pJ	10 nJ	50 pJ	10 nJ
Min pulse energy @ 100 MHz	5 pJ	1 nJ	5 pJ	1 nJ
Input polarization	linear vertical	linear vertical	linear vertical	linear vertical
Detection	CMOS 12 Bits - 3 Mpx - 72 dB	CMOS 12 Bits - 3 Mpx - 72 dB	CMOS 12 Bits - 3 Mpx - 72 dB	CMOS 12 Bits - 3 Mpx - 72 dB
PC Interface	USB 3.1	USB 3.1	USB 3.1	USB 3.1
Beam height (mm)	69 - 148	69 - 148	69 - 148	69 - 148
Dimensions (mm)	326 x 194 x 129	326 x 194 x 129	326 x 194 x 129	326 x 194 x 129

^* 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.

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

^***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…)

Measurement of a femtosecond laser using a Multi-Shot FROG system

Laser source: Toptica FemtoFiber laser at 1560 nm operated at 100 MHz

During the measurement, the software shows the spectrogram retrieved by the algorithm next to the experimental spectrogram to help quickly identify problems with the reconstruction. Below the spectrograms, a plot of the experimental and retrieved autocorrelation and 2ω spectra further help identify any differences.

Parameter	Laser Specs	Femto Easy FROG measurement
Wavelength	1560 ± 10 nm	1,564.4 nm
Pulse Width	< 80 fs (typ. 50 fs)	59.1 fs

Measurement of a femtosecond laser using a Single-Shot FROG system

Laser source: Amplitude Satsuma laser at 1030 nm

During the measurement, the experimental and retrieved spectrograms can be observed to assess the algorithm performance in extracting the spectral and temporal profile of the laser pulses.

Parameter	Laser Specs	Femto Easy FROG measurement
Wavelength	1030 ± 5 nm	1031.9 nm
Pulse Width	< 350 fs – 10 ps	284.5 fs

Data Sheet and Brochures

FemtoEasy FROG datasheet

FemtoEasy_MSFROG_datasheet

User Publications

Researchers in state of the art laboratories around the world trust Femto Easy instruments to characterize and manage their ultrafast laser sources. See below some recent publications that illustrate how you can also use Femto Easy’s robust, reliable, and easy to use measurement devices.

Spatio-temporal pulse cleaning in multi-pass cells

Optica Open – 2023

In vivo three- and four- photon fluorescence microscopy using a 1.8µm femtosecond fiber laser system

Biomedical Optics Express – 2023

Near-single-cycle pulses generated through post-compression on FAB1 laser at ATTOLAB-Orme facility

EOS Annual Meeting – November 2021

Laser pulse duration optimization with numerical methods

Journal of Accelerator Conferences Website – 2022

Generation of sub-half-cycle 10µm pulses through filamentation at kilohertz repetition rates

Optics Express – November 2020

Additional crystal	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 of the Fast FROG signal acquisition from 12 to 16 bits. Not compatible with pure single-shot measurement 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	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)
Trigger	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)

Description
Additional information

FROG System for Ultrafast Laser Characterization

We offer two types of FROG from FemtoEasy:

The Fast FROG is a single-shot FROG System, thus it needs one single pulse to measure the duration. Its innovative algorithm allow a real-time pulse retrieval.
The MS-FROG is a multi-shot FROG System. It uses an optical delay line to scan the delay, and each pulse allows to know the intensity for a particular delay. It can measure pulses with energy as low as 50 pJ. The same device can measure very short pulses and longn pulses, from 5 fs to 80 ps!

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.

Advantages of Femto Easy FROG systems over competitive technologies

No moving parts (single-shot FROG)
Broad available spectral range (480 – 2100 nm)
Can work for both single-shot and low-repetition rate and high-repetition rate applications (single-shot FROG)
Very sensitive, measurements performed with mW level lasers at 100 MHz (multi-shot FROG)
Compact and robust
Easy to align
Spectrometers manufactured by Femto Easy (no need to rely on third parties)
Full wavelength flexibility by just swapping spectrometers
Proprietary FROG algorithm for quick and accurate retrieval of even complex pulses
Can work with both compressed and highly chirped pulses
For more information, check out our ultrafast laser measurement application page.

Text1	No calibration and no tweaking necessary
Text2	Measures Spatio-Temporal couplings (Spatial Chirp, Pulse Front Tilt)
Text3	Versatile: instant-swap of spectrometer for different wavelength ranges
Text4	Broad available spectral range (480 – 2100 nm)
Text5	Sub-5 fs can be measured
Text6	Suitable for any repetition rate

FROG Systems | Ultrafast Laser Characterization

FemtoEasy FROG System for Ultrafast Laser Characterization

Single-Shot FROG

Multi-Shot FROG

Advantages of Femto Easy FROG systems over competitive technologies

Measurement of a femtosecond laser using a Multi-Shot FROG system

Measurement of a femtosecond laser using a Single-Shot FROG system

User Publications

FROG System for Ultrafast Laser Characterization

Advantages of Femto Easy FROG systems over competitive technologies

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