Advances and Applications of Laser Measurements

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Lasers, Light Sources and Sensors".

Deadline for manuscript submissions: 28 January 2025 | Viewed by 795

Special Issue Editor


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Guest Editor
1. School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
2. Harbin Institute of Technology Suzhou Research Institute, Suzhou 215000, China
Interests: LiDAR; laser interferometry measurement; precise instrument

Special Issue Information

Dear Colleagues,

Laser measurement technology is a high-precision and high-resolution method based on lasers’ well-known characteristics: monochromaticity, coherence, and directionality. Its applications span industrial manufacturing, medical imaging, and environmental monitoring. Beyond these, they include optical coherence tomography (OCT) technology, which can assist in medical diagnosis and the formulation of treatments. While its potential for use is constantly growing, LiDAR currently finds its application in intelligent driving, among a number of other contexts.

Based on these prospects, the pursuit of increasingly accurate and stabile laser measurement has become significant, and these aims should be considered in the design of laser measurement systems, as they are particularly beneficial in precision measurements and the observation of fine structures. The potential of laser measurement extends beyond mere performance improvement. It involves developing multimodal systems to capture broader information, expanding measurement boundaries to address complex environments, and integrating real-time monitoring and automation for enhanced efficiency and productivity across various applications.

This Special Issue focuses on principles, methods, and latest developments in laser measurement technology, alongside specific application cases across diverse fields. Specifically, we aim to offer a platform for the introduction of techniques and applications of laser measurements, including laser coherent detection, laser damage monitoring technology, etc. Researchers are invited to submit their contributions to this Special Issue. Topics include, but are not limited to, the following:

  • Laser interferometry;
  • Laser measurement applications;
  • LiDAR;
  • Optical fiber sensing;
  • 3D laser scanner;
  • Structured-light 3D surface imaging;
  • Laser frequency combs;
  • Optical coherence tomography (OCT);
  • Optical frequency domain reflectometry (OFDR);
  • Spectrometer and spectral analysis.

Dr. Cheng Lu
Guest Editor

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Keywords

  • laser measurement
  • interferometry
  • LiDAR
  • optical metrology
  • spectral analysis
  • structured-light

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Published Papers (1 paper)

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Research

14 pages, 10646 KiB  
Article
Efficient Depth Measurement for Live Control of Laser Drilling Process with Optical Coherence Tomography
by Jinhan Zhao, Chaoliang Zhang, Yaoyu Ding, Libing Bai and Yuhua Cheng
Photonics 2024, 11(8), 743; https://doi.org/10.3390/photonics11080743 - 8 Aug 2024
Viewed by 637
Abstract
Laser drilling is widely used for fabricating holes in the semiconductor industry due to high throughput and a small heat-affected zone. However, it produces varying depths owing to uncertain external conditions and requires live control at the rate of a few tens of [...] Read more.
Laser drilling is widely used for fabricating holes in the semiconductor industry due to high throughput and a small heat-affected zone. However, it produces varying depths owing to uncertain external conditions and requires live control at the rate of a few tens of kHz to handle the fast material removal rate. Optical coherent tomography is capable of in situ acquiring a raw interferogram at a high rate (>80 kHz), but the depth extraction is slow due to the involved heavy Fast Fourier Transform (FFT). To address this, an efficient depth-tracking algorithm is proposed to save the FFT. It searches the depth in the raw interferogram locally with a known last depth given the two truths that only one depth exists and the adjacent depths do not change significantly. The proposed algorithm was proven to expedite the measuring rate six times with sub-pixel tracking precision. To further secure the rate against the interrupting of the system, the tracking process is parallelly implemented in a field-programmable gate array. The closed-loop control tests were conducted on probe cards with depth variations introduced by offsetting laser focus. The proposed method maintained a uniform depth, with variations reduced by 80% compared to traditional methods. Full article
(This article belongs to the Special Issue Advances and Applications of Laser Measurements)
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