chanelink logo
CHANELINK
Tiếng Việt

Scientists demonstrate powerful UV-visible infrared full-spectrum laser

670
2023-08-25 14:29:07
Xem bản dịch
Figure: a. Schematic diagram of the HCF-LN-CPPLN experimental setup. W. CaF? Window M, mirror.
b. The bright white light circular spots emitted by the CPPLN sample.
c. The first-order diffraction beam of B displays a colorful rainbow pattern from purple to red.
d. The HCF-LN-CPPLN module generates normalized spectra of the output full spectrum laser signal through the second NL HHG and third NL SPM effects.
Source: Lihong Hong, Liqiang Liu, Yuanyuan Liu, Junyu Qian, Renyu Feng, Wenkai Li, Yanyan Li, Yujie Peng, Yuxin Leng, Ruxin Li, and Zhi-Yuan Li

High brightness ultra-wideband ultra-continuous white light laser has attracted more and more attention in physics, chemistry, biology, material science and other scientific and technological fields. Over the past few decades, many different methods have been developed to produce supercontinuous white lasers.

Most of them utilize a variety of third-order nonlinear effects, such as self-phase modulation (SPM) occurring in microstructured photonic crystal fibers or homogeneous plates, or noble gas-filled hollow fibers. However, the quality of these supercontinuum light sources is subject to some limitations, such as the small pulse energy at the nanojoule level, and the requirements of complex dispersion engineering.

Another more efficient means of expanding the laser spectral range is through the various second-order nonlinear effects (2nd-NL) of the quasi-phase matching (QPM) scheme. However, the spectrum and power scaling performance of these pure 2N-NL schemes are still poor due to the narrow pump band width, limited QPM operating bandwidth, and reduced efficiency of high order harmonic energy conversion.

How to solve these bad limitations in the 2nd-NL and 3rd-NL systems and make both to produce full-spectrum supercontinuum lasers with spectral coverage from ultraviolet to mid-infrared has become a great challenge.

In a new paper published in Light: Science & Applications: A team led by Professor Zhi-Yuan Li and colleagues from the School of Physics and Optoelectronics at South China University of Technology in China has demonstrated an intense, quadruple-frequency UV-Vis-IR full-spectrum laser source (300 nm to 5000 nm, peak value -25 dB) with an energy of 0.54 mJ per pulse. Aerated hollow core fiber (HCF) from a cascade structure, exposed lithium niobate (LN) crystal plates, specially designed chirped periodically polarized lithium niobate crystals (CPPLN) pumped by a 3.9 mm, 3.3 mJ mid-infrared pump pulse.

Pumped by a 3.3mJ 3.9μm mid-infrared femtosecond pulse laser, the HCF-LN system can generate a strong mid-infrared laser pulse of double bandwidth as a secondary FW pump input to CPPLN, which supports efficient broadband HHG processing, further extending the spectral bandwidth to UV-Vis-IR. It is clear that this cascade structure creatively satisfies two prerequisites for the generation of full-spectrum white light: Condition 1, a strongly frequency-doubled pump femtosecond laser, and condition 2, a nonlinear crystal with an extremely high frequency up-conversion bandwidth. In addition, the system involves a large number of synergies between 2nd-NL and 3rd-NL effects.

The synergistic mechanism they have developed provides superior capabilities for constructing UV-Vis-IR global supercontinuum spectra and filling spectral gaps between various HHGS, far exceeding what has been achieved with single-acting 2N-NL or 3rd-NL effects previously employed.

As a result, this cascaded HFC-LN-CPPLN optical module enables previously unachievable levels of strong full-spectrum laser output, not only with great bandwidth (spanning four octave multiplicities), but also with a spectral profile of high flatness (from 300 to 5000 nm, flatness better than 25 dB) and large pulse energy (0.54 mJ per pulse).

"We believe that our proposal is to use the synergy of 2NL-HHG and 3rd-NL SPM effects to create an intense four-octave UV-vision-infrared full-spectrum femtosecond laser source, which is a big step toward building supercontinuous spectral white laser sources with greater bandwidth, energy, higher spectral brightness, and flatter spectral profiles." "This intense full-spectrum femtosecond laser will provide a revolutionary tool for spectroscopy and find potential applications in physics, chemistry, biology, materials science, information technology, industrial processing and environmental monitoring," the scientists said.

Source: Chinese Optical Journal Network
Đề xuất liên quan

  • Research progress on aerospace materials and anti ablation coatings: a review

    India B R. Dr. Jalandal Ambedkar National Institute of Technology and the Indian Institute of Technology reviewed and reported on the research progress of aerospace materials and anti ablation coatings. The related paper was published in Optics&Laser Technology under the title "Progress in aerospace materials and ablation resistant coatings: A focused review".a key:1. A comprehensive overview ...

    2024-11-21
    Xem bản dịch

  • Researchers have reinvented laser free magnetic control

    In a significant advancement in material physics, researchers from Germany and the United States have theoretically demonstrated that only extremely thin materials need to be α- RuCl3 can be placed in an optical cavity to control its magnetic state.This discovery may pave the way for new methods of controlling material properties without the use of strong lasers.The Role of Optical Vacuum W...

    2023-11-09
    Xem bản dịch

  • Laser Photonics Corporation receives MF-1020 order

    Recently, Laser Photonics Corporation (LPC) announced that it has partnered with Foon Technologies to receive its second order for the DefenseTech MRL (MF-1020) handheld cleaning system, which was facilitated by a distributor.The DTMF-1020 air-cooled handheld pulse laser cleaning equipment adopts dual axis technology, simplifying the maintenance process. The system will be used by the Navy Command...

    02-27
    Xem bản dịch

  • SILICON AUSTRIA LABS and EV GROUP Strengthen Cooperation in Optical Technology Research

    EV Group, a leading supplier of wafer bonding and lithography equipment for the MEMS, nanotechnology, and semiconductor markets, and Silicon Austria Labs, a leading electronic systems research center in Austria, announced that SAL has received and installed multiple EVG lithography and photoresist processing systems in its MicroFab at the R&D cleanroom facility in Filach, Austria.These devices...

    2023-11-15
    Xem bản dịch

  • Research progress and prospects of CFRP laser surface cleaning

    Researchers from Materials Science at Harbin Institute of Technology, Zhengzhou Research Institute at Harbin Institute of Technology, and Key Laboratory of Microsystems and Microstructure Manufacturing at Harbin Institute of Technology, Ministry of Education, reviewed and reported on the research progress of laser surface cleaning of carbon fiber reinforced polymer composites (CFRP). The relevant ...

    03-06
    Xem bản dịch