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Photonics
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Laser Technology and Applications
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Laser Technology and Applications

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

Deadline for manuscript submissions: 10 June 2025 | Viewed by 5468

Special Issue Editor

Dr. Li Zhong

E-Mail Website
Guest Editor
Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Interests: high power semiconductor laser; special pump light source; solid-state laser

Special Issue Information

Dear Colleagues,

Laser technology is one of the great achievements of the 20th century. Over the past 50 years, due to the rapid development of laser technology and applications, significant breakthroughs have been made in basic scientific research such as laser cooling, semiconductor lasers, optical frequency combs, laser interference gravitational wave detection, chirped pulse amplification, and optical tweezers. At the same time, a series of new interdisciplinary and technological applications have been raised by laser technology, including laser spectroscopy, laser chemistry, quantum optics, ultrafast photonics, nonlinear optics, laser medicine and biophotonics, information optoelectronics, laser advanced manufacturing technology, laser controlled nuclear fusion technology and so on.

At present, laser technology is still one of the most promising frontier technologies and has a wide range of applications in industrial manufacturing, scientific research, precision measurement and military defense, etc. New laser light sources are generally developing towards higher power, higher brightness, higher speed, higher pulse energy, shorter pulse width, narrower line width, and wider wavelength range (extreme ultraviolet and mid-infrared wavelengths). The rapid development and wide application of next-generation laser technology will be based on cutting-edge breakthroughs in new laser materials and devices. Researchers are invited to submit their contributions to this Special Issue. Topics include, but are not limited to:

  • High-power laser
  • High-brightness laser
  • Ultrashort pulse laser
  • Attosecond laser technology
  • Narrow linewidth
  • Single-frequency laser
  • Frequency combs
  • Ultraviolet laser
  • Mid-infrared laser
  • Semiconductor lasers

Dr. Li Zhong
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • high-power laser
  • high-brightness laser
  • ultrashort pulse laser
  • attosecond laser technology
  • narrow linewidth
  • single-frequency laser
  • frequency combs
  • ultraviolet laser
  • mid-infrared laser
  • semiconductor lasers

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (6 papers)

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Research

10 pages, 8292 KiB  
Communication
Low-Timing Jitter Single-Frequency Pulse Output from a Passively Q-Switched Monolithic Non-Planar Ring Oscillator
by Mingwei Gao, Yibo Ding, Qing Wang, Lei Wang, Yuan Gao and Chunqing Gao
Photonics 2024, 11(12), 1120; https://doi.org/10.3390/photonics11121120 - 27 Nov 2024
Viewed by 507
Abstract
A low-timing jitter passively Q-switched monolithic non-planar ring oscillator (NPRO) with diffusion-bonded Cr4+: YAG in a single-frequency operation was realized. The pulse parameters were controlled by a Cr4+: YAG saturable absorber, while the single-frequency operation was ensured by the [...] Read more.
A low-timing jitter passively Q-switched monolithic non-planar ring oscillator (NPRO) with diffusion-bonded Cr4+: YAG in a single-frequency operation was realized. The pulse parameters were controlled by a Cr4+: YAG saturable absorber, while the single-frequency operation was ensured by the unidirectional ring cavity structure. The pulse trigger was actively provided by a gain switcher utilizing a composite pumping scheme. The dependence of the timing jitter between the output pulse and the trigger signal on the parameters of the composite pumping scheme was investigated both theoretically and experimentally. Using this approach, we achieved a single-frequency pulsed laser output with a timing jitter of 14.568 ns (RMS) at a repetition rate of 100 Hz corresponding to a pulse width of 5.99 ns. This novel Q-switched monolithic NPRO, which integrates the benefits of both active and passive Q-switching, results in a simple and reliable structure that achieves a low-timing jitter single-frequency pulse output. Full article
(This article belongs to the Special Issue Laser Technology and Applications)
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10 pages, 2907 KiB  
Article
Induced Emission on Transitions from Vibrational Excited Levels of the KrF Molecule
by Sofia Yampolskaya, Arcady Yastremskii, Yuri Panchenko, Alexey Puchikin and Sergey Bobrovnikov
Photonics 2024, 11(11), 1088; https://doi.org/10.3390/photonics11111088 - 20 Nov 2024
Viewed by 514
Abstract
The paper considers the possibility of extending the spectral region of the wavelength tuning of a discharge KrF amplifier due to induced transitions from the vibrational excited states of the electronic level B. The model of the KrF amplifier on a He/Kr/F2 [...] Read more.
The paper considers the possibility of extending the spectral region of the wavelength tuning of a discharge KrF amplifier due to induced transitions from the vibrational excited states of the electronic level B. The model of the KrF amplifier on a He/Kr/F2 mixture is presented, in which the behavior of the vibrational level populations is consistent with the excitation conditions of the active medium. The simulation results show that the shift in the operating wavelength to the short-wavelength region is possible in excitation modes, when the birth rate of excimer molecules is greater than the rate of their relaxation from upper to lower vibrational levels. The theoretical dependences of gain on the wavelength for different pressures were obtained. They confirm the possibility of tuning the KrF amplifier wavelength in the range of up to 10 nm while maintaining a gain of at least 0.5 of its maximum value. Full article
(This article belongs to the Special Issue Laser Technology and Applications)
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10 pages, 1681 KiB  
Article
Effects of Gain Saturation on Orbital Instability of Chaotic Laser Diode with External Pseudorandom Signal
by Satoshi Ebisawa
Photonics 2024, 11(10), 954; https://doi.org/10.3390/photonics11100954 - 11 Oct 2024
Viewed by 588
Abstract
In a laser diode (LD) system with optical injection, the effects of gain saturation of the LD on the orbital instability of the system are analyzed numerically. For the optical injection LD system without signal application, it is shown that the effect of [...] Read more.
In a laser diode (LD) system with optical injection, the effects of gain saturation of the LD on the orbital instability of the system are analyzed numerically. For the optical injection LD system without signal application, it is shown that the effect of optical injection is suppressed in the system with gain saturation and small optical injection, and that a higher amount of optical injection is necessary to obtain similar dynamics. Next, in the optical injection LD system with a pseudo-random signal applied to the LD drive current, it is confirmed that when the dynamics are a periodic window between chaotic and chaotic regions, chaotic dynamics are actualized as the standard deviation of the applied signal becomes larger. Furthermore, it is suggested that this phenomenon can be explained by linear stability analysis, and it is shown by introducing randomly varying tentative gain coefficients that gain fluctuations that lead to an expansion of the chaotic region. Hence, the results of this study provide research on the effects of gain saturation on chaotic oscillation in LDs with pseudo-random signals applied and contribute to the generation of more complex chaotic signals, chaotic secure communication, and random number generation. Full article
(This article belongs to the Special Issue Laser Technology and Applications)
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13 pages, 10590 KiB  
Article
Simplified 1.5 μm Distributed Feedback Semiconductor Laser (DFB-LD) Frequency Stabilization System Based on Gas Absorption Chamber
by Ju Wang, Ye Gao, Jinlong Yu, Ziheng Cai, Hao Luo and Chuang Ma
Photonics 2024, 11(7), 621; https://doi.org/10.3390/photonics11070621 - 28 Jun 2024
Cited by 1 | Viewed by 818
Abstract
The classical 1.5 μm band frequency-stabilized laser using acetylene gas saturated absorption can achieve high frequency stability and reproducibility, but its system design is complex and bulky. For some practical applications, a simple, compact system containing anti-interference abilities is preferred. In this [...] Read more.
The classical 1.5 μm band frequency-stabilized laser using acetylene gas saturated absorption can achieve high frequency stability and reproducibility, but its system design is complex and bulky. For some practical applications, a simple, compact system containing anti-interference abilities is preferred. In this study, a low-cost and simple-structured 1.5 μm frequency-stabilized laser is constructed using digital control methods, wavelength modulation technology, and acetylene gas absorption. The fiber input and output optical devices of the system significantly simplify the optical path and reduce the volume of the system. The error signal is obtained by the first-order differential method, and a combination of the high-speed comparator circuit and the microcontroller unit (MCU) is used to detect the error signal. Through the feedback control method of coarse temperature adjustment and fine current adjustment, the second-level frequency stability of the laser is stabilized within 100 kHz, that is, the frequency stability reaches 10​−10. The designed system achieved continuous and stable operation for more than 6 h, and the long-term frequency stability reached 10​−9. Full article
(This article belongs to the Special Issue Laser Technology and Applications)
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9 pages, 249 KiB  
Article
Few ns Pulse Duration of Gain-Switched Ho:YAG Laser Pumped by an Active Q-Switched Tm:YLF Laser
by Shaul Avichai Golan, Rotem Nahear, Yechiel Bach and Salman Noach
Photonics 2024, 11(6), 572; https://doi.org/10.3390/photonics11060572 - 18 Jun 2024
Viewed by 841
Abstract
This paper describes a gain-switched Ho:YAG laser that emitted at 2089 nm, driven by an actively Q-switched Tm:YLF laser as the pumping source. The laser attained few ns short pulse durations with high energies at controlled repetition rates due to the active Q-switch [...] Read more.
This paper describes a gain-switched Ho:YAG laser that emitted at 2089 nm, driven by an actively Q-switched Tm:YLF laser as the pumping source. The laser attained few ns short pulse durations with high energies at controlled repetition rates due to the active Q-switch pump source. Using the gain-switch method, stable short pulse durations ranging from 3.5 to 7.2 ns, with an energy per pulse of 0.4 to 0.52 mJ, were achieved at repetition rates of up to 2.5 kHz. This design can have significant advantages in various fields, where accuracy in the repetition rate is essential and a passive Q-switch cannot be implemented due to its accuracy limitations, including sensing, LIDAR, medical procedures, and material processing. Full article
(This article belongs to the Special Issue Laser Technology and Applications)
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10 pages, 2111 KiB  
Article
Analysis of Plasma Dynamics in He-Ne Lasers with Different Gas Ratios
by Yuanhao Mao, Jing Hu, Hongteng Ji, Shiyu Guan, Dingbo Chen, Qiucheng Gong, Wei Liu, Xingwu Long and Zhongqi Tan
Photonics 2024, 11(3), 276; https://doi.org/10.3390/photonics11030276 - 21 Mar 2024
Viewed by 1481
Abstract
He-Ne lasers play a crucial role in ultra-precision measurement and optical sensing across various fields. For many applications based on He-Ne lasers, a higher output power is required to enhance the accuracy and signal-to-noise ratios of the associated optical measurements. However, conventional methods [...] Read more.
He-Ne lasers play a crucial role in ultra-precision measurement and optical sensing across various fields. For many applications based on He-Ne lasers, a higher output power is required to enhance the accuracy and signal-to-noise ratios of the associated optical measurements. However, conventional methods to increase the output power by reducing the diameter of the He-Ne laser discharge capillary inevitably result in higher diffraction losses and constrain the lasing performance. Here, we propose an approach to enhance laser pumping efficiency and output power through optimizing the ratios of He and Ne gasses. The validity of our proposal has been confirmed by both numerical simulations of He-Ne laser plasma discharge processes and experimental demonstrations, showing that the optimal gas ratio increases with the capillary diameter and total gas pressure. Full article
(This article belongs to the Special Issue Laser Technology and Applications)
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