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A high-efficiency regime for gas-phase terahertz lasers.

Fan Wang1,2, Jeongwon Lee2, Dane J Phillips3

  • 1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139; wangfan@mit.edu joannop@mit.edu stevenj@math.mit.edu everitt@phy.duke.edu.

Proceedings of the National Academy of Sciences of the United States of America
|June 13, 2018
PubMed
Summary

We developed a new model for optically pumped far-infrared (OPFIR) lasers, achieving 10x higher efficiency and 1000x smaller volume. This compact terahertz source offers significant improvements over existing technologies.

Keywords:
continuous wave gas laserlaser modelingoptically pumped far-infrared laserrotational population inversionterahertz source

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Area of Science:

  • Physics
  • Quantum Electronics
  • Spectroscopy

Background:

  • Optically Pumped Far-Infrared (OPFIR) lasers are crucial for terahertz (THz) radiation generation.
  • Existing OPFIR laser models struggle to accurately predict performance at high pressures.
  • Current commercial OPFIR lasers are often bulky and inefficient.

Purpose of the Study:

  • To develop an innovative theoretical model for OPFIR lasers.
  • To experimentally validate the new model and laser design.
  • To demonstrate a highly efficient and compact THz source.

Main Methods:

  • Developed an ab initio theoretical model accounting for millions of degrees of freedom.
  • Experimentally constructed and tested a 0.25 THz OPFIR laser.
  • Compared experimental results with theoretical predictions.

Main Results:

  • Achieved 10x greater efficiency (39% of Manley-Rowe limit) and 1000x smaller volume compared to commercial lasers.
  • The ab initio model quantitatively matched experimental data without free parameters.
  • Demonstrated that small cavities and high pressures enhance OPFIR laser performance.

Conclusions:

  • The new theoretical model accurately describes high-pressure OPFIR laser dynamics.
  • Compact, high-pressure OPFIR lasers are significantly more efficient.
  • This work revives interest in OPFIR lasers as powerful, compact THz sources.