Louchet-Chauvet, AAhlefeldt, RoseChaneliere, Thierry2020-06-302020-06-300034-6748http://hdl.handle.net/1885/205643Vibrations in cryocoolers are a recurrent concern to the end user. They appear in different parts of the acoustic spectrum depending on the refrigerator type, Gifford McMahon or pulse-tube, and with a variable coupling strength to the physical system under interest. Here, we use the piezospectroscopic effect in rare-earth doped crystals at a low temperature as a high resolution, contact-less probe for the vibrations. With this optical spectroscopic technique, we obtain and analyze the vibration spectrum up to 700 kHz of a 2 kW pulse-tube cooler. We attempt an absolute calibration based on known experimental parameters to make our method partially quantitative and to provide a possible comparison with other well-established techniques.application/pdfen-AU© Author(s) 2019http://creativecommons.org/licenses/by/4.0/201910.1063/1.50800862020-01-27Creative Commons Attribution (CC BY) license