chanelink logo
CHANELINK
日本語

Scientists demonstrate powerful UV-visible infrared full-spectrum laser

244
2023-08-25 14:29:07
翻訳を見る
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
関連のおすすめ

  • Shanghai Optics and Machinery Institute has made progress in the research of new terahertz sources based on Yb lasers

    Recently, the State Key Laboratory of Intense Field Laser Physics of the Chinese Academy of Sciences Shanghai Institute of Optics and Fine Mechanics has made new progress in generating intense field terahertz waves based on Yb laser pumped organic crystals. The relevant research results were published in Applied Physics Letters under the title "Efficient strong field THz generation from DSTMS crys...

    2024-04-09
    翻訳を見る

  • Fabrinet Laser Business Revenue Surges

    Recently, Fabrinet released its financial report for the three months ended December 27, 2024, showing that its sales and revenue exceeded expectations. During the reporting period, the company achieved sales of $834 million, a year-on-year increase of 17%. Net income increased by 25% during the same period, reaching $86.6 million.Although the growth in performance is still dominated by the optica...

    02-07
    翻訳を見る

  • Progress has been made in the research of single shot characterization technology for complex combination laser pulses at Shanghai Institute of Optics and Fine Mechanics

    Recently, the research team of the High Power Laser Physics Joint Laboratory at the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, has made significant progress in the study of single shot characterization technology for complex combination laser pulses. The research team utilized an improved broadband transient grating frequency resolved optical switch technology (T...

    03-24
    翻訳を見る

  • Luxiner launches LXR platform to set new standards for industrial laser microfabrication

    Luxiner, a globally renowned laser technology leader, proudly launches its latest innovative product, the groundbreaking LXR ultra short pulse laser platform. This cutting-edge technology represents a significant leap in industrial laser processing, providing unparalleled performance, versatility, and reliability.In today's rapidly changing industrial environment, laser technology plays a crucial ...

    2024-03-25
    翻訳を見る

  • Researchers have demonstrated a breakthrough boson sampling method using ultracold atoms in optical lattices

    JILA researcher, National Institute of Standards and Technology (NIST) physicist, physics professor Adam Kaufman and his team at the University of Colorado Boulder, as well as NIST collaborators, demonstrated a new method of cross laser beam lattice sampling using ultracold atoms for boson sampling in two-dimensional optics. This study, recently published in the journal Nature, marks a significant...

    2024-05-10
    翻訳を見る