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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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As early chemists discovered more elements, they realized that various elements could be grouped by their similar chemical behaviors. One such grouping includes lithium (Li), sodium (Na), and potassium (K). All of these elements are shiny, conduct heat and electricity well, and have similar chemical properties. A second grouping includes calcium (Ca), strontium (Sr), and barium (Ba), which also are shiny, good conductors of heat and electricity, and have chemical properties in common. However,...
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The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
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The oral cavity, or the mouth, is a complex structure in humans that plays a vital role in our day-to-day lives. Its role is not only in chewing and swallowing food; it also plays a role in speech and facial expressions.
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Polymer Lasing in a Periodic-Random Compound Cavity.

Tianrui Zhai1, Xiaofeng Wu2, Songtao Li3

  • 1Institute of Information Photonics Technology and College of Applied Sciences, Beijing University of Technology, Beijing 100124, China. trzhai@bjut.edu.cn.

Polymers
|April 10, 2019
PubMed
Summary
This summary is machine-generated.

This study demonstrates simultaneous distributed feedback (DFB) lasing and polarized random lasing in a novel compound cavity. The grating structure influences the directionality and polarization of the random laser, enabling integrated laser source design.

Keywords:
compound cavitydistributed feedback laserpolymer laserrandom laser

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Distributed feedback (DFB) lasers offer wavelength selectivity.
  • Random lasers provide unique emission properties but often lack directionality and polarization control.
  • Compound cavities integrating periodic and random structures are underexplored for advanced laser functionalities.

Purpose of the Study:

  • To investigate the simultaneous occurrence of DFB lasing and linear polarized random lasing.
  • To explore the influence of a grating structure on the characteristics of random lasing.
  • To assess the potential for creating integrated laser sources using a periodic-random compound cavity.

Main Methods:

  • Fabrication of a grating cavity using interference lithography.
  • Creation of a random cavity by spin-coating a silver nanoparticle-doped polymer onto the grating.
  • Optical pumping of the compound cavity to induce lasing.

Main Results:

  • Simultaneous DFB lasing and linear polarized random lasing were successfully observed.
  • The grating structure was found to modify the directionality and polarization of the random laser emission.
  • The periodic-random compound cavity design enables controlled laser output.

Conclusions:

  • The developed compound cavity effectively integrates DFB and random lasing mechanisms.
  • Grating-modified random lasing offers a pathway to control laser output properties.
  • This research paves the way for the development of novel integrated laser sources with tailored characteristics.