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This publisher's note contains corrections to Opt. Lett.46, 1478 (2021)OPLEDP0146-959210.1364/OL.418996.This Letter reports the experimental realization of a novel, to the best of our knowledge, active power stabilization scheme in which laser power fluctuations are sensed via the radiation pressure driven motion they induce on a movable mirror. The mirror position and its fluctuations were determined by means of a weak auxiliary laser beam and a Michelson interferometer, which formed the in-loop sensor of the power stabilization feedback control system. This sensing technique exploits a nondemolition measurement, which can result in higher sensitivity for power fluctuations than direct, and hence destructive, detection. Here we used this new scheme in a proof-of-concept experiment to demonstrate power stabilization in the frequency range from 1 Hz to 10 kHz, limited at low frequencies by the thermal noise of the movable mirror at room temperature.We propose astigmatic dual-beam interferometric particle imaging (ADIPI) to simultaneously measure the three-dimensional (3D) position and size of spherical metal droplets. A theoretical model reveals that the orientation and spacing of the ADIPI fringes generated from the two reflections propagating through an astigmatic imaging system relate to the depth position and size, respectively. Proof-of-concept experiments on micron-sized gallium droplets are performed, and the tilted fringes in elliptical patterns are observed in the ADIPI interferogram, confirming theoretical predictions. Droplet 3D position and size are determined with ADIPI, and the relative discrepancies are within 5% and 2% compared to those with a dual-view digital inline holography system, demonstrating the feasibility and high accuracy of ADIPI.This work proposes an underwater wireless optical communication (UWOC) system based on computational temporal ghost imaging (CTGI) and a low-bandwidth high-sensitivity avalanche photodiode. After measuring the attenuation coefficient of water, a series of neutral density filters is used to attenuate the optical power to estimate the distance of UWOC. Experimental results show that under the conditions of 4 GHz transmitting frequency and 144.37 m estimated distance, through CTGI, we can achieve error-free transmission, and the peak signal-to-noise ratio is much higher than on-off keying. Additionally, after adopting the segmented reconstruction method, under the condition of 4 GHz transmitting frequency and 193.10 m estimated distance, we can also achieve error-free transmission. At the same time, the relationship between UWOC performance and the number of segments is also studied. This research provides a novel UWOC technique that enables high-frequency transmission signals to be detected by a low-bandwidth photodetector for long-distance UWOC.In the quasi-periodic structure (QPS) containing InSb, a nonreciprocal absorber with a narrow band of angular polarization sensitive regions is studied. Due to the effective role of the antireflection layers (ALs), the effective impedance of the overall structure matches the vacuum wave impedance. Benefiting from the special absorption structure, an absorption band will be created in the photonic bandgap. The results of the investigation show that, with the same parameters, the QPS has a larger frequency bandwidth than the periodic structure and, if the incident frequency of the electromagnetic wave is the same, the former has a larger angular selective range. The degrees of polarization separation and nonreciprocal ability of the presented QPS can be regulated by temperature and magnetic induction intensity. Consequently, the proposed QPS can provide a new basis for the development of polarization separators and nonreciprocal devices.Metalenses enable the multifunctional control of light beams with an optically thin layer of nanoantennas. Efficient on-chip voltage tuning of the focal length is the crucial step toward the integration of metalenses into dynamically tunable optical systems. We propose and numerically investigate the on-chip electrical tuning of a reflective metalens via an optomechanic cavity. Light is focused by an array of silicon nanopillar antennas separated from a deformable metallic reflector by a small air gap. A transparent electrode is inserted into the optomechanic cavity to electrostatically deform the reflector and rearrange the reflection phase profile, resulting in a shift in the focal point. Two modes of voltage tuning via the relative curvature change of the reflector are analyzed. In mode 1, the size of the air gap is modified through the nearly parallel shift of the reflector, whereas in mode 2, the distribution of the air-gap size is tailored by the curvature change of the reflector. With the designed working wavelength of 3.8 µm and the initial focal length of 80.35 µm, the focal length is shifted by 20.3 µm in mode 1 and 7.25 µm in mode 2. Such a device can be used as a free space coupler between quantum cascade lasers and mid-infrared fibers with variable coupling efficiency.This publisher's note contains corrections to Opt. Lett.46, 1486 (2021)OPLEDP0146-959210.1364/OL.418085.This publisher's note contains corrections to Opt. Lett.44, 5788 (2019)OPLEDP0146-959210.1364/OL.44.005788.This work demonstrates a thermometric technique using laser-induced fluorescence (LIF) in supercritical carbon dioxide flows in a micro-channel. Rhodamine 6G was used as a temperature-sensitive fluorescent dye. The flow conditions were at a pressure of 7.9 MPa and temperature in the range of 23°-90°C. 2D spatial distributions and time-resolved temperature profiles were obtained at this high pressure. Measured LIF signals showed close relations to the temperatures obtained from resistance temperature detectors.X-ray microscopy offers the opportunity to image biological and radiosensitive materials without special sample preparations, bridging optical and electron microscopy capabilities. However, the performance of such microscopes, when imaging radiosensitive samples, is not limited by their intrinsic resolution, but by the radiation damage induced on such samples. Here, we demonstrate a novel, to the best of our knowledge, radio-efficient microscope, scanning Compton X-ray microscopy (SCXM), which uses coherently and incoherently (Compton) scattered photons to minimize the deposited energy per unit of mass for a given imaging signal. MS-275 We implemented SCXM, using lenses capable of efficiently focusing 60 keV X-ray photons into the sub-micrometer scale, and probe its radio-efficient capabilities. SCXM, when implemented in high-energy diffraction-limited storage rings, e.g., European Synchrotron Radiation Facility Extremely Brilliant Source and PETRA IV, will open the opportunity to explore the nanoscale of unstained, unsectioned, and undamaged radiosensitive materials.