Low-noise rotating sample holder for ultrafast transient spectroscopy at cryogenic temperatures
Rev. Sci. Instrum. , Volume 78 - Issue Article number: 53102 p. 1- 5
We present the design and testing of a rotating device that fits within a commercial helium cryostat and is capable of providing at 4 K a fresh sample surface for subsequent shots of a 1Â–10 kHz amplified pulsed laser. We benchmark this rotator in a transient-absorption experiment on molecular switches. After showing that the device introduces only a small amount of additional noise, we demonstrate how the effect of signal degradation due to high fluence is completely resolved.