Skip to main content

Thank you for visiting You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.


Temporal flexibility

Opt. Lett. 41, 1498–1501 (2016)

Transient absorption spectroscopy is widely used to study short-lived substances. The usual pump–probe and continuous-wave approaches for studying the absorption response of a sample, however, suffer from limited temporal regimes of operation and resolution. Tatsuo Nakagawa and collaborators from Unisoku and Nihon University in Japan have now devised a method based on a randomly interleaved pulse train (RIPT), thus combining continuous-wave and pulsed strategies. The scheme requires two asynchronous radiation sources, in this case a picosecond laser (producing the pump beam) with repetition frequency Rrep = 1 kHz and a supercontinuum light source (generating probe pulses) with Rrep = 20 MHz. Pump–probe delays are evaluated passively through repeated pumping cycles. The researchers determine pump–probe delays with better than 10-ps accuracy, and demonstrate measurement time windows ranging from less than a nanosecond up to the microsecond scale. The experimental transient absorption spectra for C60 shows that the RIPT method gives access to previously unobserved excited states for this substance; the researchers also acquire spectra over visible to near-infrared wavelengths. Furthermore, this technique makes it possible to correct transient absorption spectra for fluorescence contamination.


Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Donati, G. Temporal flexibility. Nature Photon 10, 285 (2016).

Download citation


Quick links

Nature Briefing

Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily.

Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing