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Updated: Feb 17, 2026

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT

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Aspheric optical surface profiling based on laser scanning and auto-collimation.

Hongbo Xie¹, Min Jiang¹, Yao Wang¹

¹College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information Technology, Ministry of Education, Tianjin 300072, China.

The Review of Scientific Instruments

|December 3, 2017

Summary

This summary is machine-generated.

A new laser scanning instrument accurately measures aspheric surfaces, crucial for advanced optical systems. This fast and simple profiler achieves high precision, validating its use in optical component characterization.

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Published on: June 6, 2017

Area of Science:

Optical engineering
Metrology
Surface characterization

Background:

Aspheric lenses are increasingly vital in optical design for improved system performance.
Accurate and rapid surface profiling of aspheric components is essential for optical system optimization.

Purpose of the Study:

To design and develop a novel, simple instrument for fast and accurate surface profiling of axially symmetric aspheric surfaces.
To address the growing demand for precise characterization of aspheric optical components.

Main Methods:

A unique mapping technique correlating reflective mirror position/rotation with laser reflection points during scanning.
Utilizing a high-resolution grating guide rail, indexing plate, and position sensitive detector (PSD) with laser auto-collimation for accuracy.
Employing geometrical optics principles for the instrument's design and operation.

Main Results:

Experimental validation on both convex and concave aspheric surfaces.
Achieved coefficient of determination > 0.99999 and Root Mean Square (RMS) error < 1.5 μm compared to conventional methods.
Demonstrated feasibility and high accuracy of the developed surface profiling method.

Conclusions:

The developed instrument provides a powerful tool for rapid and accurate aspheric surface measurement.
The system's stable structure and simple algorithm contribute to its effectiveness.
Further analysis of systematic errors can enhance measurement precision.