Reducing the residual focus error signal in optical pickup head astigmatism displacement systems using the signal conditioning method

Vo, Quangsang; Zhang, Xiaodong; Zhu, Linlin

doi:10.1364/ao.57.009972

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…The astigmatic detection method is widely used in digitalversatile-disk pickup heads, offering advantages such as high speed, small laser spot, compact size, and low cost [20]- [23].…”

Section: B Astigmatic Detection Systemmentioning

confidence: 99%

Astigmatic Detection System With Feedback Mechanism for Calibrating Driving Waveform of Piezoelectric Actuators

Liao,

Guo,

Tan

et al. 2023

IEEE Trans. Instrum. Meas.

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Piezoelectric actuators are used extensively in precision measurement, manufacturing, and manipulation owing to their high resolution, rapid response, and considerable force output. However, the nonlinear characteristics of piezoelectric materials, including hysteresis and creep, increase the complexity to achieve accurate positioning. Common methods rely on creating an inverse model of the actuator to enable linear movement. This study presents a novel calibration method based on an astigmatic detection system for directly measuring the calibrated driving waveform. This method can be applied to various types of piezoelectric actuators and does away with the need for complicated modeling and parameter identification. The experiment section demonstrates the calibration process of a piezoelectric XYZ scanner. The test results reveal that the linearity of the XYZ scanner, driven by the calibrated driving waveforms, closely approximates that of a commercial closedloop nanopositioner. Additionally, atomic force microscopy This work was financially supported by the National Science and Technology Council of Taiwan (MOST 111-2221-E-002-162 and NSTC 112-2221-E-002-246) and the LEO Foundation (Grant No. LF-OC-20-000370).

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“…The astigmatic detection method is widely used in digitalversatile-disk pickup heads, offering advantages such as high speed, small laser spot, compact size, and low cost [20]- [23].…”

Section: B Astigmatic Detection Systemmentioning

confidence: 99%

Astigmatic Detection System With Feedback Mechanism for Calibrating Driving Waveform of Piezoelectric Actuators

Liao,

Guo,

Tan

et al. 2023

IEEE Trans. Instrum. Meas.

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“…Besides, tuning high-frequency dynamic signals in real-time with imaging techniques would require complex systems. Comprehensive optical signal conditioning systems have been realized 24 to modulate the response of optical systems. Active 25 and passive 26 optical signal filtering techniques have been developed that require multiple expensive and customized components with operational range limitations.…”

Section: Introductionmentioning

confidence: 99%

Active Optical Signal Conditioning and Monitoring System

Chatterjee

Sahu

Arumuru

et al. 2022

Preprint

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An optical signal conditioning technique for dynamic modulation of signals and real-time monitoring of events is pivotal for developing various optical systems at micro/nano dimensions. The utilities of such technique include controllable signal enhancement and distinctive response towards external stimuli, with reconfigurable operational range. Here, we propose and demonstrate an optical technique based on the parallel integration of fiber modal interferometers for optical response enhancement and multi-signal monitoring. Overlap of the interferometers’ characteristic spectra facilitates controllable signal filtering, attenuation, and amplification of interferometer’s response towards dynamic field over wide frequency range of 1 Hz – 1 kHz. Signal to noise ratio (SNR) enhancement of 9 dB is achieved by applying 1 volt about the reference interferometer. The system enables real-time modulation of optical signals and multipoint signal monitoring using machine learning for various applications such as mechanical vibrations, acoustic fields, biological samples, fluid movement, and other similar dynamic fields.

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Optical pickup unit-based fluorescence microscope with autofocus and deep learning capabilities

Zhao,

Guo,

et al. 2024

Biomedical Analysis

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Reducing the residual focus error signal in optical pickup head astigmatism displacement systems using the signal conditioning method

Cited by 8 publications

References 25 publications

Astigmatic Detection System With Feedback Mechanism for Calibrating Driving Waveform of Piezoelectric Actuators

Astigmatic Detection System With Feedback Mechanism for Calibrating Driving Waveform of Piezoelectric Actuators

Active Optical Signal Conditioning and Monitoring System

Optical pickup unit-based fluorescence microscope with autofocus and deep learning capabilities

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