chanelink logo
CHANELINK
Español

Scientists demonstrate powerful UV-visible infrared full-spectrum laser

1124
2023-08-25 14:29:07
Ver traducción
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
Recomendaciones relacionadas

  • Laser cleaning equipment manufacturer LPC receives multiple orders

    Recently, laser cleaning equipment manufacturer Laser Photonics Corporation (LPC) has disclosed multiple orders in a row.On December 26th, LPC received an order from Walsh Service Solutions to purchase a handheld laser cleaning equipment. It is understood that the manufacturer is purchasing CleanTech IR-3040, a high-performance handheld fiber laser cleaning device designed by LPC, mainly used for ...

    2024-12-31
    Ver traducción

  • On demand ultra short laser flash: controllable optical pulse pairs from a single fiber laser

    Set up a dual comb fiber laser oscillator, external pulse combination, and real-time detection.In innovative methods for controlling ultra short laser flashes, researchers from Bayreuth University and Konstanz University are using soliton physics and two pulse combs in a single laser. This method has the potential to greatly accelerate and simplify laser applications.Traditionally, the pulse inter...

    2024-01-12
    Ver traducción

  • Shanghai Institute of Optics and Mechanics proposes a new solution for quartz glass as a visible light laser material

    Recently, Hu Lili, a research group of the Advanced Laser and Optoelectronic Functional Materials Department of the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, proposed a new scheme based on rare earth ions Dy3+doped quartz glass as a yellow laser material, and the relevant research results were published in the Journal of the American Ceramic Society as "Effect o...

    2024-06-05
    Ver traducción

  • Advanced optical giant Schott announces completion of Malaysia factory

    Recently, German optical giant SCHOTT is pleased to announce that its advanced production plant located in Gulim, Kedah, Malaysia has been successfully completed. This milestone event was celebrated with the joint witness of employees, clients, and representatives from the Malaysian Investment Development Authority (MIDA).The completion of the new factory marks a significant increase in Schott's...

    2024-10-16
    Ver traducción

  • South Korean DE&T will open new subsidiaries in the United States and Canada

    Recently, DE&T, a South Korean manufacturer of secondary batteries and display laser equipment, announced that the company will further expand its overseas business by opening new subsidiaries in the United States and Canada. According to its claim, this move is to carry out maintenance services for laser equipment locally. As of now, DE&T's overseas subsidiaries have increased from two to...

    04-08
    Ver traducción