Optimization design and testing of optical antennas for laser Doppler vibrometers
Traditional laser vibrometers often use helium-neon lasers,which do not meet the safety requirements of the human eye and are susceptible to interference from sunlight.The optical antennas used in these systems mostly operate within the radiation band of helium-neon lasers.However,they suffer from drawbacks such as complex structure,high cost,low collection efficiency,and short working distance.In order to address these issues,a three-piece integrated optical antenna working at 1 550 nm was designed and produced based on the beam expanding and focusing principles of the near-infrared wavelength range,with Zemax serving as the design tool and spot diagrams and wavefront maps as primary analysis methods,showing a simple structure and cost-effectiveness.The analysis results show that focused light spots with a diameter less than 2 mm can be obtained within a working distance range of 0.3-15.0 m;the test results indicate a maximum collection efficiency of 51.6%.Integrating this optical antenna into a self-designed laser Doppler vibrometer enabled vibration measurements at different working distances,effectively expanding the application range and scenarios of laser vibrometers.This innovation has significant potential applications in fields such as mechanical engineering,aviation,architecture,medicine,and agriculture.
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