Solid-state laser refrigeration of a composite semiconductor Yb:YLiF4 optomechanical resonator

摘要

The schematic of the eigenfrequency and up-converted fluorescence measurement setup. FL, M, SPF, DL, BS, VND, and APD stand for focusing lens, mirror, 1000 nm short-pass filter, diode laser, beamsplitter, variable neutral density filter, and avalanche photodiode, respectively. A bright-field optical image of the CdSNR cantilever supported using a silicon substrate with a Yb :YLF crystal placed at the free end. A peak in the thermomechanical noise spectrum originating from the fundamental eigenfrequency of the CdSNR with Yb :YLF sample obtained at the 0.04 MW cm at 300 K. A stitched, up-converted fluorescence spectrum obtained at room temperature using a 1020-nm excitation source (0.04 MW cm ) focused on the suspended Yb :YLF crystal. A 1000-nm short-pass filter was used to cut off the laser line.