ROC stands for Row Optical Correlator. Based on an ultra compact and robust inline setup, the ROC allows the measurement of 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.
- Ultra compact
- Installation and measurement in less than 2 minutes! No calibration necessary
- Suitable for any repetition rate
- Single-pulse extraction possible up to 150 kHz laser repetition rate (with Enhanced detection option)
- User-friendly and powerful software (STAR : Software Technology for Acquisition and Retrieval)
- Input pulse energy from few pJ to few mJ
- Acceptable average power up to 3.5 W
- Pulse measurement from 5 fs to 10 ps
- Broad available spectral range
|Pulse duration range||min||5 fs||20 fs||50 fs||70 fs||100 fs||300 fs|
|max||150 fs||500 fs||1 ps||3 ps||5 ps||10 ps|
|Accessible spectral range (nm)||480 - 21001||800 - 21001|
|Input pulse repetition rate||single-shot to GHz2|
|Single-pulse measurement||up to 150 kHz laser repetition rate (with Enhanced detection option, or 40 kHz without)|
|Min input pulse energy3||Single-shot||1 µJ (10 nJ with low-energy option)|
|1 MHz||10 nJ (500 pJ with low-energy option)|
|1 GHz||50 pJ (low-energy option required)|
|Input polarization||linear horizontal or vertical|
|Detection||CMOS 12 Bits - 3 Mpx - 72 dB|
|PC Interface||USB 3.1 (or GigE as an option)|
|Beam height (mm)||adjustable from 30 mm|
|Dimensions (mm)||55 x 56 x 265||55 x 56 x 195|
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 150 kHz. 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. The exact sensitivity depends on many parameters (pulse duration, beam profile, wavelength…)
|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 150 kHz)|
|Fiber input connector||Plug&play collimation module with fiber connector. Can be mounted on the ROC to easily switch the input from free-space to fiber. No alignment required.|
|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|
|Low energy||Internal or external module (depending on ROC model) to increase the sensitivity of the device when the laser power is too weak|
|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|
|Small beam||Internal or external module (depending on ROC model) to increase the input beam diameter when it is too small (necessary for beams typically in the range of few mm or less)|
|Trigger||Synchronization of the ROC detection to an external signal for accurate laser single pulse extraction up to 80 kHz (150 kHz with the Enhanced detection option)|
Measurement of few cycle pulses
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
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.