Micromachined spatial filters for quantum cascade lasers

Abigail Hedden, Patrick Pütz, C. D'Aubigny, Dathon Golish, Christopher Groppi, Christopher Walker, Benjamin Williams, Qing Hu, John Reno

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Quantum Cascade Lasers (QCL) are the most promising technology for producing compact, high power (> 1 mW), coherent signal sources above 2 THz. Due to their small size (10 μm × 25 μm) and rectangular cross-section, the output beam from a QCL laser cavity is highly divergent and non-Gaussian. A single mode Gaussian beam is desirable for efficient coupling to optical systems. We have designed a waveguide spatial filter for this purpose. The 2.7 THz spatial filter consists of two diagonal feed horns connected by one wavelength of square waveguide (92 μm on a side). The mode filtering efficiency and far field beam pattern of the structure have been modeled in CST Microwave Studio. We have fabricated the filter in tellurium copper using a Kern MMP micromilling machine. We present measurements of the QCL's throughput and emergent power pattern with and without the filter. Our preliminary findings suggest that spatial filtering significantly improves the QCL beam pattern, and further measurements are being made to more rigorously explore these results.

Original languageEnglish (US)
Title of host publication17th International Symposium on Space Terahertz Technology 2006, ISSTT 2006
Pages181-184
Number of pages4
StatePublished - Dec 1 2006
Event17th International Symposium on Space Terahertz Technology 2006, ISSTT 2006 - Paris, France
Duration: May 10 2006May 12 2006

Publication series

Name17th International Symposium on Space Terahertz Technology 2006, ISSTT 2006

Other

Other17th International Symposium on Space Terahertz Technology 2006, ISSTT 2006
CountryFrance
CityParis
Period5/10/065/12/06

Keywords

  • Beam pattern
  • Quantum cascade lasers
  • Terahertz
  • Waveguide spatial filters

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Space and Planetary Science
  • Atomic and Molecular Physics, and Optics
  • Radiation

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    Hedden, A., Pütz, P., D'Aubigny, C., Golish, D., Groppi, C., Walker, C., Williams, B., Hu, Q., & Reno, J. (2006). Micromachined spatial filters for quantum cascade lasers. In 17th International Symposium on Space Terahertz Technology 2006, ISSTT 2006 (pp. 181-184). (17th International Symposium on Space Terahertz Technology 2006, ISSTT 2006).