A new apparatus for mechanical Q-factor measurements between 5 and 300K

Nawrodt, R.; Zimmer, A.; Nietzsche, Sándor; Thürk, M.; Vodel, W.; Seidel, P.

doi:10.1016/j.cryogenics.2006.06.001

Cited by 16 publications

(16 citation statements)

References 15 publications

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“…The mechanical loss was calculated by fitting an exponential curve to the measured amplitude ring down. The experimental design and technique used are described in detail in [31] and details of the cryostat can be found in [32]. Figure 3 shows the measured mechanical loss of the first three bending modes of both the coated and control samples between 10 K and 292 K. Each point is the average loss calculated from at least three ring-down measurements and has a standard error of typically less than 3%.…”

Section: Methodsmentioning

confidence: 99%

Measurements of a low-temperature mechanical dissipation peak in a single layer of Ta ₂ O ₅ doped with TiO ₂

Martin

Armandula

Comtet

et al. 2008

Class. Quantum Grav.

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Thermal noise arising from mechanical dissipation in oxide coatings is a major limitation to many precision measurement systems, including optical frequency standards, high-resolution optical spectroscopy and interferometric gravity wave detectors. Presented here are measurements of dissipation as a function of temperature between 7 K and 290 K in ion-beam-sputtered Ta 2 O 5 doped with TiO 2 , showing a loss peak at 20 K. Analysis of the peak provides the first evidence of the source of dissipation in doped Ta 2 O 5 coatings, leading to possibilities for the reduction of thermal noise effects.

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Section: Methodsmentioning

confidence: 99%

Measurements of a low-temperature mechanical dissipation peak in a single layer of Ta ₂ O ₅ doped with TiO ₂

Martin

Armandula

Comtet

et al. 2008

Class. Quantum Grav.

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“…The setup at the FSU Jena consists of a 5 W CW 1550 nm fiber laser system (NKT Photonics Koheras Adjustic seed laser and Boostik HPA amplifier) and a custom-made bath cryostat [13] for measurements between room temperature and 5 K. The laser beam has a measured waist radius of 0.9 mm inside the sample resulting in a power density of 0.4 kW cm −2 . The sample under investigation is a float zone 100 Ω cm silicon single crystal having a diameter of 150 mm and a thickness of 86 mm as shown in figure 1(a).…”

Section: Description Of the Setup At The Fsu Jenamentioning

confidence: 99%

Measurement of the optical absorption of bulk silicon at cryogenic temperature and the implication for the Einstein Telescope

Degallaix

Komma

Forest

et al. 2014

Class. Quantum Grav.

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We report in this article on the measurement of the optical absorption of moderately doped crystalline silicon samples at 1550 nm, which is a candidate material for the main optics of the low temperature interferometer of the Einstein Telescope (ET). We observe a nearly constant absorption from room temperature down to cryogenic temperatures for two silicon samples presenting an optical absorption of 0.029 cm −1 and 780 ppm cm −1 , both crystals doped with boron. This is in contradiction to what was assumed previously-a negligible optical absorption at low temperature due to the carrier freezeout. As the main consequence, if the silicon intrinsic absorption can not be lowered, the cross section of the mirror suspension of the ET must be increased to be able to carry away the excess heat generated by the partially absorbed laser beam during the operation of the interferometer.

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“…Avoiding gas-damping, the probe volume can be evacuated to a pressure lower than 10 −3 Pa using a turbo-molecular pump. Details of the cryostat are given in [20]. Figure 1 shows a schematic overview of the measuring setup.…”

Section: Overviewmentioning

confidence: 99%

“…Yamamoto et al [19] Article published by EDP Sciences and available at http://www. [20]. A second test sample (here 90 degrees rotated for clarity) is symmetrically placed in the probe volume for thermometry using a Lakeshore DT-670 temperature sensor.…”

Section: Introductionmentioning

confidence: 99%

High mechanical Q-factor measurements on calcium fluoride at cryogenic temperatures

Nawrodt

Zimmer

Koettig

et al. 2007

Eur. Phys. J. Appl. Phys.

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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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A new apparatus for mechanical Q-factor measurements between 5 and 300K

Cited by 16 publications

References 15 publications

Measurements of a low-temperature mechanical dissipation peak in a single layer of Ta ₂ O ₅ doped with TiO ₂

Measurements of a low-temperature mechanical dissipation peak in a single layer of Ta ₂ O ₅ doped with TiO ₂

Measurement of the optical absorption of bulk silicon at cryogenic temperature and the implication for the Einstein Telescope

High mechanical Q-factor measurements on calcium fluoride at cryogenic temperatures

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A new apparatus for mechanical Q-factor measurements between 5 and 300K

Cited by 16 publications

References 15 publications

Measurements of a low-temperature mechanical dissipation peak in a single layer of Ta 2 O 5 doped with TiO 2

Measurements of a low-temperature mechanical dissipation peak in a single layer of Ta 2 O 5 doped with TiO 2

Measurement of the optical absorption of bulk silicon at cryogenic temperature and the implication for the Einstein Telescope

High mechanical Q-factor measurements on calcium fluoride at cryogenic temperatures

Contact Info

Product

Resources

About

Measurements of a low-temperature mechanical dissipation peak in a single layer of Ta ₂ O ₅ doped with TiO ₂

Measurements of a low-temperature mechanical dissipation peak in a single layer of Ta ₂ O ₅ doped with TiO ₂