Combining the respective advantages of Nd:YAG and Nd:YVO4 crystals in achieving the 1.06-μm band laser, we proposed and demonstrated a highly efficient acousto-optically (AO) Q-switched dual-crystal hybrid gain laser. It not only had excellent power performance but also exhibited satisfactory polarization characteristics across a broad pulse repetition frequencies (PRFs) range. Under 42.00-W incident pump power, the maximum average output powers were 12.10 W and 19.64 W at the PRFs of 10 kHz and 200 kHz, respectively. The corresponding optical-to-optical efficiency rose from 28.81% to 46.76%. The results were significantly better than those of the conventional single-crystal laser in our control experiments. The laser polarization ratios at maximum average output power were ~7.6:1 and ~11:1 when the PRFs were 10 kHz and 200 kHz, respectively.
An all-fiber optic high-sensitivity displacement sensor based on 45°-spliced PM Lyot filter is proposed and its sensing performance is investigated experimentally. According to the relationships between the dips and the displacements, the sensor has a good linearity in passive mode, whose R square is larger than 0.998, and the highest sensitivity of 132.55 pm/μm is obtained in the range of 200 μm displacement variation. Moreover, it can be compatible to an intracavity displacement sensing system, achieving narrow linewidth, high signal-to-noise ratio (SNR), and high resolution. It can be found that the sensitivity of the intracavity displacement sensor can be 60 pm/μm when the PMF fiber length is about 20 cm with a linewidth narrower than 0.05 nm and a SNR higher than 55 dB.
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