I've had the pleasure to try it out, it's really as easy as advertised ! I was really impressed. The software is also very user friendly both for production and research as it's packed with very interesting features.
Great video explaining the principle of the ROC. We confirmed that it is a very easy and convinient tool to use for femtosecond lasers characterisation.
Thank you for your comments. We have several options and would love to discuss them in more details. Please contact us at info@femtoeasy.eu to get in touch with a specialist.
Hello Safayet Ahmed. Thank you for your question. The maximum pulse width that can be currently measured with our autocorrelator is 80 ps (with the multi-shot MS-ROC system). Pulse width higher than that can still be measured with a lower accuracy, but 400-500 ps is unfortunately out of the measurement range anyway.
Hello Zander Zahnartz, thank you for the comment and questions. Basically, a ROC and a Grenouille are completely different. A ROC is designed to easily yield a reliable autocorrelation, while the Grenouille is made to simplify a FROG scheme. It would therefore be faster to enumerate the similarities instead the differences. Indeed, the only common optics is the biprism that was invented by Augustin Jean Fresnel at the beginning of the 19th century. Even the nonlinear crystals, that are optics present in almost any pulse measurement devices, are different. The crystal of the Grenouille is thick in order to separate the SHG spectrum by angular phase matching, while the crystal of the ROC is really thin to be able to convert the full bandwidth and leave the pulse unaffected. Also there are three cylindrical lenses in a Grenouille, where there is only one spherical lens in a ROC... Concerning the slight asymmetry of the autocorrelation that is observable in the pedestal, it is because the ROC has been aligned very quickly for the needs of the video. Indeed, if the two beamlets that produce the autocorrelation are not balanced, it will create an asymmetry in the autocorrelation signal. But the beautiful thing with the ROC is that, even with a very quick alignment and a slight asymmetry in the autocorrelation, it yields the proper pulse duration !
I've had the pleasure to try it out, it's really as easy as advertised ! I was really impressed. The software is also very user friendly both for production and research as it's packed with very interesting features.
Great video explaining the principle of the ROC. We confirmed that it is a very easy and convinient tool to use for femtosecond lasers characterisation.
Do you have any solutions that can determine the time between two 5fs pulses if they are separated by 15-20fs?
Thank you for your comments. We have several options and would love to discuss them in more details. Please contact us at info@femtoeasy.eu to get in touch with a specialist.
Can it measure Pulse width of 400-500 ps?
Hello Safayet Ahmed. Thank you for your question. The maximum pulse width that can be currently measured with our autocorrelator is 80 ps (with the multi-shot MS-ROC system). Pulse width higher than that can still be measured with a lower accuracy, but 400-500 ps is unfortunately out of the measurement range anyway.
In which way is the ROC different from the Grenouille by Swamp Optics? And why is the autocorrelation asymmetric?
Hello Zander Zahnartz, thank you for the comment and questions.
Basically, a ROC and a Grenouille are completely different.
A ROC is designed to easily yield a reliable autocorrelation, while the Grenouille is made to simplify a FROG scheme. It would therefore be faster to enumerate the similarities instead the differences. Indeed, the only common optics is the biprism that was invented by Augustin Jean Fresnel at the beginning of the 19th century. Even the nonlinear crystals, that are optics present in almost any pulse measurement devices, are different. The crystal of the Grenouille is thick in order to separate the SHG spectrum by angular phase matching, while the crystal of the ROC is really thin to be able to convert the full bandwidth and leave the pulse unaffected. Also there are three cylindrical lenses in a Grenouille, where there is only one spherical lens in a ROC...
Concerning the slight asymmetry of the autocorrelation that is observable in the pedestal, it is because the ROC has been aligned very quickly for the needs of the video. Indeed, if the two beamlets that produce the autocorrelation are not balanced, it will create an asymmetry in the autocorrelation signal. But the beautiful thing with the ROC is that, even with a very quick alignment and a slight asymmetry in the autocorrelation, it yields the proper pulse duration !