Sub-femto-Newton sensing torsion pendulum for detecting of light force
Posted on 21.09.2022 - 20:54
Mechanical oscillators is widely used in many fields of physics including ultra-high precision measurements, gravity experiments and Optical mechanical systems. A sub-gram-scale silicon wafer is suspended by a tungsten wire with a diameter of 8 microns , forming a torsion pendulum to detect the laser radiation pressure. We demonstrate the application of a low-frequency, highly sensitive torsion pendulum for the measurement of light forces. In the feedback cooling state , the system exhibits a force sensitivity at the end of the pendulum close to 0.1 fN, approaches the thermal noise limit, reaches the detection level of the laser radiation pressure of 60 nanowatts.
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Guan, Shengguo; Sun, Jing; Huang, Biao; Cheng, Yanbei; duan, zhenglu; Le, Jianxin (2022): Sub-femto-Newton sensing torsion pendulum for detecting of light force. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.6183916.v2
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