Wednesday, June 7, 2023
SCIENMAG: Latest Science and Health News
No Result
View All Result
  • Login
  • HOME PAGE
  • BIOLOGY
  • CHEMISTRY AND PHYSICS
  • MEDICINE
    • Cancer
    • Infectious Emerging Diseases
  • SPACE
  • TECHNOLOGY
  • CONTACT US
  • HOME PAGE
  • BIOLOGY
  • CHEMISTRY AND PHYSICS
  • MEDICINE
    • Cancer
    • Infectious Emerging Diseases
  • SPACE
  • TECHNOLOGY
  • CONTACT US
No Result
View All Result
Scienmag - Latest science news from science magazine
No Result
View All Result
Home SCIENCE NEWS Chemistry AND Physics

Direct generation of complex structured light

March 18, 2022
in Chemistry AND Physics
0
Share on FacebookShare on Twitter

Extension of laser beam structures promises new laser applications. Exploration of how beam structures change during nonlinear frequency conversion processes has drawn increasing interest in recent years. Nonlinear conversion is an excellent route for structured beam generation and represents a growing, hybrid field for researchers in nonlinear optics and laser technology, as well as the emerging area of light-field regulation technology.

Intracavity nonlinear frequency conversion of transverse mode locking states generates new structured beams.

Credit: Zilong Zhang and Yuchen Jie

Extension of laser beam structures promises new laser applications. Exploration of how beam structures change during nonlinear frequency conversion processes has drawn increasing interest in recent years. Nonlinear conversion is an excellent route for structured beam generation and represents a growing, hybrid field for researchers in nonlinear optics and laser technology, as well as the emerging area of light-field regulation technology.

For structured beam generation and nonlinear frequency conversion, researchers have considered both intracavity oscillation and external cavity spatial modulation. To achieve flexible outputs, spatial light modulators can be used to obtain structured beams both inside and outside the laser cavity. But this is an indirect, inefficient method. Intracavity nonlinear frequency generation of structured beams offers a direct, efficient method that has only rarely been investigated, until recently.

Inside a laser cavity, an effect known as “transverse mode locking” (TML) enables the direct generation of the vortex beams or optical vortices from a laser cavity. It is known that both solid-state microchip lasers and VCSELs can produce quite similar outputs of TML beam patterns under large Fresnel number pumping conditions. The complex transverse patterns formed by the TML effect, commonly composed of different basic modes with different weight coefficients and different locking phases, make for abundant spatial information in fundamental frequency modes. Nonlinear frequency conversion of these directly generated TML beams is of great interest, but not yet well studied.

As reported in Advanced Photonics, researchers from the Beijing Institute of Technology, Tsinghua University, and Arizona State University recently investigated intracavity second harmonic generation (SHG) of various passively Q-switched laser beams in TML states. They analyzed the electrical field transformation and propagation principle of the SHG of TML mode, precisely predicting the complex far-field beam patterns of the SHG beam, fundamental frequency, and transverse modes. Structured TML beams and their SHG beams are generated simultaneously by a sandwich-like microchip laser cavity that is passively Q-switched. The team observed many rare SHG far-field beam patterns and their experiments showed good agreement with the simulations.

The study shows that parametric variation (especially the phase difference of fundamental frequency modes) for the TML modes greatly changes the far-field beam patterns of the SHG beam. Generated SHG beam patterns vary with the propagation, from the beam waist to several times the Rayleigh length, and then they remain stable into the far field. The SHG beam patterns were observed to have more obvious structural characteristics than those of the fundamental frequency beam.

The generation of TML laser modes, especially the frequency-converted ones, opens intriguing new avenues for obtaining various structured beams with a direct, intracavity method. This work will help advance future applications of structured beams, particularly in optical 3D printing, optical trapping of particles, and free-space optical communication areas.

Read the open access article by Z. Zhang et al., “Second harmonic generation of laser beams in transverse mode locking states,” Adv. Photonics 4(2) 026002 (2022), doi 10.1117/1.AP.4.2.026002.



Journal

Advanced Photonics

DOI

10.1117/1.AP.4.2.026002

Article Title

Second harmonic generation of laser beams in transverse mode locking states

Article Publication Date

14-Mar-2022

Tags: complexdirectgenerationlightstructured
Share26Tweet16Share4ShareSendShare
  • Innovation at Pennington Biomedical Research Center gets new emphasis

    67 shares
    Share 27 Tweet 17
  • When it comes to bumblebees, does size matter?

    65 shares
    Share 26 Tweet 16
  • Why are dog breeds with innate diseases popular?

    65 shares
    Share 26 Tweet 16
  • Null results research now published by major behavioral medicine journal

    786 shares
    Share 314 Tweet 197
  • Investigating the placenta: Discovery from Stowers Scientists shows why this often-overlooked organ should be given more attention

    64 shares
    Share 26 Tweet 16
  • Children with attention, behavior problems earn less money, have less education, poorer health as adults

    65 shares
    Share 26 Tweet 16
ADVERTISEMENT

About us

We bring you the latest science news from best research centers and universities around the world. Check our website.

Latest NEWS

UTHSC researchers’ work on human pangenome aids understanding of common chromosomal abnormality

Null results research now published by major behavioral medicine journal

Multiple sclerosis more prevalent in Black Americans than previously thought

Subscribe to Blog via Email

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

Join 206 other subscribers

© 2023 Scienmag- Science Magazine: Latest Science News.

No Result
View All Result
  • HOME PAGE
  • BIOLOGY
  • CHEMISTRY AND PHYSICS
  • MEDICINE
    • Cancer
    • Infectious Emerging Diseases
  • SPACE
  • TECHNOLOGY
  • CONTACT US

© 2023 Scienmag- Science Magazine: Latest Science News.

Welcome Back!

Login to your account below

Forgotten Password?

Retrieve your password

Please enter your username or email address to reset your password.

Log In