Femto Easy, ultrafast instrumentation

MS-ROC Autocorrelator

MS-ROC stands for Multi-Shot Row Optical Correlator. The MS-ROC allows the measurement of autocorrelation traces. It is based on second harmonic generation, making it reliable and compact. It has been specially developed for sources with sub-nJ energy per pulse. It allows the measurement of pulses from 50 fs to 40 ps in the standard version. With its high scan speed, real-time operations is possible for measurement and optimization. The MS-ROC-LP can perform scan at 130 ps/s, making it the fastest scanning autocorrelator on the market. Also, the MS-ROC-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). Like every products, the MS-ROC is easy to install and use.

Features

  • Ultra simple alignment (2 min to setup)
  • Large pulse duration measurement range (from 5 fs to 80 ps)
  • High sensitivity (sub-nJ pulse)
  • User-friendly and powerful software (STAR : Software Technology for Acquisition and retrieval)
  • Broad available spectral range
  • Fiber connector available (FC/APC, FC/PC)

Specifications

MS-ROC models MS-ROC MS-ROC-SP MS-ROC-LP MS-ROC-SLP
Pulse duration range min 50 fs 5 fs 100 fs 25 fs
max 40 ps 40 ps 80 ps 80 ps
Fine scan mode range not applicable 5 – 50 fs not applicable 25 – 500 fs
Accessible spectral range (nm) 500 - 2000 1
Spectral Window Δλ (nm) From 200 to 700 1
Minimum temporal resolution 6.7 fs standard : 6.7 fs 13.4 fs standard : 13.4 fs
fine scan : 0.1 fs fine scan : 0.2 fs
Scan speed > 65 ps/s standard : > 65 ps/s > 130 ps/s standard : > 130 ps/s
fine scan : > 50 fs/s fine scan : > 500 fs/s
Input pulse repetition rate 100 Hz to GHz 2
Min input pulse energy 1 MHz 500 pJ 10 nJ 500 pJ 1 nJ
100 MHz 50 pJ 1 nJ 50 pJ 100 pJ
Input polarization linear vertical
Detection CMOS 12 Bits – 3 Mpx – 72 dB
PC Interface USB 3.1
Beam height (mm) 70 - 150
Dimensions (mm) 213 x 162 x 125

1 Effective spectral bandwidth to be defined within the accessible spectral range according to customer's requirements

2 Low repetition rate available as an option.

Software

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.
The image is a screenshot of the ROC software interface.

Measurement of few cycle pulses

Few cycle pulse measurement example
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-700.
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.

Measurement of low energy pulses

Low energy pulse measurement example
This measurement has been performed on a femtosecond Ti:Sapph oscillator at LCAR with a ROC FC-400 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 buttom, the raw image of the spatially resolved autocorrelation trace.
On the top, the analysed autocorrelation trace integrated over the spatial coordinate. The experimental data (in blue) are fitted by a Gaussian function (in red). The full width at half maximum of the autocorrelation trace is 30.4 fs for a Gaussian pulse duration of 21.5 fs.