Initial study of linking quartz crystal microbalance sensed nanograms to laser power

Abstract

In this study, an optical system for linking quartz crystal microbalance (QCM) sensed nanograms to laser power has been demonstrated by hybridising a laser power measuring system with a QCM. QCM sensed masses are linked with equivalent masses of the photon radiance force at nanogram level with acceptable differences and/or errors. For laser power at 5.78 mW–85.1 mW, equivalent masses of photon radiance force are 2.78 ng–40.96 ng, respectively. Correspondingly, mass dependent resonant frequency shifts sensed by QCM are 0.88 Hz–10.83 Hz, indicating that QCM sensed mass changes are 3.53 ng–43.32 ng, respectively. Updates and improvement toward the measurement system are still needed to get rid of the small differences and/or errors between photon radiance force equivalent masses and QCM sensed masses. The calibrations of the geometry and optical instrument are necessary for translating this method into traceable applications.