chanelink logo
CHANELINK
Polski

Scientists demonstrate powerful UV-visible infrared full-spectrum laser

912
2023-08-25 14:29:07
Zobacz tłumaczenie
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
Powiązane rekomendacje

  • Dark Solitons Discovered in Ring Semiconductor Lasers

    Dark solitons - the extinction region in a bright background - spontaneously form in a ring semiconductor laser. Observations conducted by an international research group may lead to improvements in molecular spectroscopy and integrated optoelectronics.Frequency comb - a pulse laser that outputs light at equidistant frequencies - is one of the most important achievements in the history of laser ph...

    2024-02-01
    Zobacz tłumaczenie

  • Xunlei Laser 20000W Large Format Laser Cutting Machine Winning the Bid for YD Company, a Famous Enterprise in the Steel Structure Industry

    Recently, the Xunlei Laser HI series 20000W large format laser cutting machine won the bid of YD Company, a well-known steel structure company, to help YD steel structure improve quality, efficiency, and green transformation!Established in 2009, YD Steel Structure is a large-scale specialized steel formwork enterprise that has established deep business partnerships with leading construction indust...

    2023-11-06
    Zobacz tłumaczenie

  • Progress has been made in the development of anti resonant hollow core fiber Raman probes with low background noise at Shanghai Optics and Machinery Institute

    Recently, the research team of the Special Glass and Fiber Research Center of the Advanced Laser and Optoelectronic Functional Materials Department of the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, aimed at the demand for in-situ detection of Raman signals, expanded the functions of the laboratory commercial Renishaw Invia confocal micro Raman spectrometer by usi...

    2024-05-22
    Zobacz tłumaczenie

  • Laserline completes 70% equity acquisition of WBC Photonics

    Recently, Laserline, a leading semiconductor laser manufacturer in Germany, announced that it has completed the acquisition of a 70% stake in WBC Photonics, a Boston based laser technology expert, marking a significant strategic expansion for Laserline. Through this transaction, Laserline not only expands its product portfolio to include blue laser systems with excellent beam quality (better tha...

    2024-09-20
    Zobacz tłumaczenie

  • The United States is expected to use "AI+lasers" to deal with space debris in the future

    Due to the increasing threat of space debris in low Earth orbit around the Earth, space agencies around the world are becoming increasingly concerned about this. According to a new study funded by the National Aeronautics and Space Administration (NASA), it may be possible to send space debris that may be at risk of colliding with orbiting spacecraft to safer orbits through a laser network deploye...

    2023-10-20
    Zobacz tłumaczenie