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Abstract. Mechanical Q-factor measurements of single crystalline calcium fluoride CaF 2 bulk material are presented. Resonant modes between 27 and 100 kHz were investigated on a cylindrical test sample (∅ 75 mm × 75 mm). For selected modes low temperature measurements of the mechanical Q-factor were done within a temperature range from 5 to 300 K. For the Q-measurements a ring-down technique was used. The substrate was suspended as a pendulum by means of a tungsten wire loop. The highest Q-factor has been achieved around 60 K with 3 × 10 8 which is the highest Q-factor reported on CaF 2 up to now. PACS

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