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Conventional OPAs incorporating a diffraction grating were mainly developed to achieve a two-dimensional spot beambased scan, which inevitably requires a wide range of wavelength tuning, leading to unaffordable complexity and limited scanning speed. In this study, we demonstrate a hybrid OPA that capitalizes on a silicon nitride line beam emitter based on tapered waveguides array, which facilitates efficient line beam scanning exhibiting flexible vertical field-of-views (FOVs) at a wavelength of 1550 nm. The line beam is horizontally scanned by driving an array of hybrid-integrated thermo-optic polymer phase modulators. The vertical FOV can be flexibly adjusted by varying the tip widths of the tapers and thus the angular divergence of emitted beams, leading to flexible FOVs ranging from 30°× 14°to 30°× 47°. A lens module is particularly devised and tethered to the OPA, thereby further tailoring and amplifying the FOVs along vertical and horizontal directions. The proposed hybrid OPA in conjunction with a lens module was practically manufactured to efficiently substantiate desired line beam scanning, achieving FOVs ranging from 51°× 0.6°to 51°× 10.3°. The developed line-beam-based OPA is anticipated to play an integral role in embodying an advanced LiDAR system featuring fast beam scanning.

Introduction: In China, with the further deepening of educational reform, the professional pressure of Middle School Physical Education Workershas gradually attracted social attention. If the pressure on work cannot be handled correctly, it may have a serious impact on the physical and mental health of Middle School Physical Education Workers, and then bring adverse consequences to the education work they are engaged in. Based on this, this paper puts forward the research on the solution to the depression symptoms of Middle School Physical Education Workers under work pressure. Research objects and methods: The research method is to conduct statistical analysis with the help of research tools such as Job Stress Scale and Symptom Checklist. Results: From the returned questionnaires, we can know that bad work pressure will have a negative impact on the physical and mental health and work attitude of Physical Education Workers in Middle School and Middle School, resulting in the imbalance of teachers' physical and mental functions and the decline of social adaptability. Moreover, male teachers showed significantly higher total stress and workload than female teachers. Conclusion: In today's society with accelerated development and fierce competition, with the accelerated pace of life, the uncertainties of work and life are increasing. Middle School Physical Education Workers are facing contradictions from work and life, and challenges and pressures are increasing. Therefore, Middle School and Middle School should formulate countermeasures to alleviate the psychological pressure of Middle School Physical Education Workers, and Middle School Physical Education Workers should actively face the work pressure, learn the correct way to cope with the pressure, be good at relieving their own pressure, so as to better engage in work and embrace life enthusiastically.

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