ROC Autocorrelator Single-Shot

Pulse duration measurement with unmet user-experience

ROC (Row Optical AutoCorrelator) is a compact and robust inline setup to measure single-shot autocorrelation traces. Specifically designed to offer the easiest user experience, they cannot be misaligned and no calibration or tweaking is needed. Also, they are easily transportable. And yes, they are rock-solid! Besides those advantages, the ROC autocorrelators provide excellent technical performances and highly accurate measurements. The ROC autocorrelators are available for different wavelength ranges and several pulse durations.

For unrivaled speed and shot-to-shot pulse measurements

Ultra easy to use
Less than 2 minutes setup time, no calibration necessary, onboard ND filter wheel (optional)

Any repetition rate, from fs to ps, broad wavelength range

Our history graph show pulse duration changes over time – perfect for unattended long-term measurements

Spatially-resolved measurements
Measurement of beam profile and pulse duration distribution over one diameter

Single-Shot Autocorrelator

Compact ROC autocorrelator

With 55 x 56 x 195 mm in size, the ROC embodies design, UX-experience and robustness in the compact class of autocorrelators.

Autocorrelator with ND-Filter Femto Easy

Alignment in seconds

Simply bring the ROC to the correct beam height and insert it into the beam

Femto Easy ROC Autocorrelator: Technical Insights

Technical specifications

Femto Easy’s ROC single-shot pulse measurement tool comes with a range of unique features and configuration options. From femtoseconds to picoseconds. Compare the technical specifications and discover your favorite model.

Pulse duration min5 fs10 fs20 fs50 fs70 fs100 fs300 fs
Pulse duration max150 fs250 fs500 fs1 ps3 ps5 ps10 ps
Accessible spectral range (nm)1480 - 2100480 - 2100480 - 2100480 - 2100480 - 2100480 - 2100800 - 2100
Dimensions (mm)55 x 56 x 23355 x 56 x 26555 x 56 x 23355 x 56 x 19555 x 56 x 19555 x 56 x 19555 x 56 x 195
Input pulse repetition rate2Single-shot to GHz
Single-pulse measurementup to 125 kHz laser repetition rate (with Trigger and Enhanced Detection options, or 18 kHz without)
Min input pulse energy3
Single-shot : 1 µJ at 30 fs
40 MHz : 500 pJ at 30 fs
Single-shot : 1 µJ at 300 fs
40 MHz : 300 pJ at 300 fs
Variable ND Filteryes
Iris Apertureyes
Input polarizationlinear horizontal (vertical if mounted on the side)
DetectionCMOS 12 Bits - 3 Mpx - 72 dB
PC InterfaceUSB 3.1
Beam height (mm)Adjustable from 30 mm
1 Effective spectral bandwidth to be defined within the accessible spectral range according to customer's requirements

2 The measurements are averaged over several pulses for laser with repetition rate higher than 62.5 kHz (with Enhanced Detection option). Custom versions available on request. For lower power and wider pulse duration ranges, Multi-Shot scanning versions are available (MS-ROC).

3 Those values give an order of magnitude for a 1030 nm laser. The exact sensitivity depends on many parameters (pulse duration, beam profile, wavelength…)

Optional Features

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

Synchronization of the ROC detection to an external signal for accurate laser single pulse extraction up to 36 kHz (125 kHz with the Enhanced detection option)

Integrated attenuation
Internal ND filter wheel can be added for built-in attenuation. Useful in the case of measuring low rep rate, high energy (mJ) laser sources

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

Enhanced detection
Replacement of the default camera embedded in the ROC by a higher performance one to increase the specifications of the system (better temporal resolution, single-shot extraction up to 125 kHz with the Trigger option)


All key data conveniently displayed: The Femto Easy software has been designed to be user friendly and intuitive. This is a modern software compatible with touchscreen that can run either under Linux or Windows. It allows distant control of the devices via PC, tablet or smartphone. We can also provide custom software developments upon request.

Screenshot Software ROC Autocorrelator

Single-Shot Autocorrelator in the Lab


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Pulse duration measurement made easy

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

Measurement example under challenging conditions: few cycle pulses

Few cycle pulse at 5.9 fs imaged with our fully nonachromatic autocorrelator design

This is an autocorrelation measurement sample of ultrashort pulse that has been performed in Politecnico di Milano with our short pulse model autocorrelator ROC FC. On the top, the raw image of the spatially resolved autocorrelation trace.
At the bottom, the analysed autocorrelation trace integrated over the spatial coordinate. The experimental data (in red) are fitted by a Gaussian function (in blue). The full width at half maximum of the autocorrelation trace is 8.3 fs. The corresponding Gaussian pulse duration is 5.9 fs.

Low energy pulse of Ti:Sapph with 0.3 nJ per pulse

Femtosecond Ti:Sapph oscillator at LCAR shot with a ROC FC autocorrelator:
The average power used for the measurement was with only 20 mW at 62 MHz repetition rate. It means that in this conditions 0.3 nJ per pulse was enough to get a clean measurement. At the bottom, the raw image of the spatially resolved autocorrelation trace.
On the top, the analysed autocorrelation trace integrated over the spatial coordinate. The experimental data (blue) are fitted by a Gaussian function (red). The FWHM of the autocorrelation trace is 30.4 fs for a Gaussian pulse duration of 21.5 fs.