Photodetectors for Next-Generation Imaging and Sensing Systems

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: 30 September 2025 | Viewed by 243

Special Issue Editor


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Guest Editor
School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
Interests: optics; laser technology (photoelectric detection; target recognition; coherent optical communication; high-power laser; photoelectric imaging and artificial intelligence image processing)
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Special Issue Information

Dear Colleagues,

Photodetectors are critical components in many areas, with applications that range from imaging and sensing to communications and environmental monitoring. This Special Issue covers the methodologies used to synthesize these cutting-edge materials; their potential to enhance photodetection performance;  the design and fabrication of photodetectors with novel structures and physics, emphasizing devices that achieve high figure-of-merit parameters, such as enhanced sensitivity, fast response times, and broad spectral detection; and the demonstration of the new applications enabled by these advanced photodetectors, including flexible and wearable devices, next-generation imaging systems, and environmental sensing technologies. Through this Special Issue, we aim to provide insights into current trends and future directions in the field of photodetection, guiding further research and development in this rapidly evolving area.

This Special Issue invites manuscripts that introduce the recent advances in Photodetectors for Next-Generation Imaging and Sensing Systems. All theoretical, numerical and experimental papers are accepted. Topics of interest for this Special Issue include, but are not limited to, the following:

Novel photodetectors;

Advanced imaging techniques;

New sensing systems;

New laser technologies.

Dr. Changqing Cao
Guest Editor

Manuscript Submission Information

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Keywords

  • photodetectors
  • two-dimensional materil
  • imaging technique
  • sensing system
  • laser technology

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Published Papers (1 paper)

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Research

12 pages, 2674 KiB  
Article
Effect of Lower-Level Relaxation on the Pulse Generation Performance of Q-Switched Nd:YAG Laser
by Fuqiang Ma, Shiyu Wang, Bingbin Li, Peijin Shang, Jinyou Li and Zheyuan Li
Photonics 2025, 12(5), 408; https://doi.org/10.3390/photonics12050408 - 24 Apr 2025
Viewed by 139
Abstract
When analyzing and designing Q-switched Nd:YAG lasers, the impact of lower-energy-level relaxation on the pulse waveform is often ignored. This approximation typically does not result in significant deviations when the laser pulse duration is much longer than the relaxation time of the lower [...] Read more.
When analyzing and designing Q-switched Nd:YAG lasers, the impact of lower-energy-level relaxation on the pulse waveform is often ignored. This approximation typically does not result in significant deviations when the laser pulse duration is much longer than the relaxation time of the lower energy level. However, when the pulse duration approaches the nanosecond range, the spontaneous emission time of lower energy level in the Nd:YAG crystal, which is approximately 30 ns, can severely affect the pulse waveform. In this study, a theoretical model is proposed to investigate the influence of lower-energy-level relaxation on the output pulse waveform of an Nd:YAG laser. Specifically, the output waveform of a narrow-pulse-width Q-switched Nd:YAG laser is simulated. The results indicate that for narrow-pulse-width laser output, lower-energy-level relaxation causes a secondary peak to appear after the main peak of the Q-switched pulse. The energy of this secondary peak is more than two times higher than that of the main peak. An experimental system for acousto-optic Q-switched Nd:YAG lasers has also been established, and the Q-switched pulse waveforms are measured under conditions similar to those in the simulations. The tail peak phenomenon observed in the experiments is consistent with the simulation results, verifying the accuracy of the theoretical model. These findings provide a crucial theoretical foundation for understanding and optimizing Nd:YAG lasers and have significant implications for the development of similar technologies. In laser technology, particularly for applications requiring high precision and performance, considering such factors is essential for optimizing the design and functionality of laser systems. Full article
(This article belongs to the Special Issue Photodetectors for Next-Generation Imaging and Sensing Systems)
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