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Single mode quantum cascade lasers with shallow-etched distributed Bragg reflector.

Peter Fuchs1, Jochen Friedl, Sven Höfling

  • 1nanoplus GmbH, Oberer Kirschberg 4, 97218 Gerbrunn, Germany. Peter.Fuchs@nanoplus.com

Optics Express
|March 16, 2012
PubMed
Summary

We developed single mode quantum cascade lasers with a novel frequency selective element. These lasers offer wide tuning ranges and high spectral resolution for gas sensing applications.

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Area of Science:

  • Optics and Photonics
  • Semiconductor Devices
  • Laser Physics

Background:

  • Quantum cascade lasers (QCLs) are crucial for mid-infrared applications.
  • Achieving single mode operation and wide tunability in QCLs remains a challenge.
  • Distributed Bragg reflectors (DBRs) are effective frequency selective elements.

Purpose of the Study:

  • To fabricate and characterize single mode quantum cascade lasers using a shallow-etched DBR.
  • To investigate the tuning characteristics and output power of the fabricated lasers.
  • To evaluate the spectral resolution achievable with these lasers in gas absorption experiments.

Main Methods:

  • Fabrication of single mode QCLs incorporating a shallow-etched DBR.
  • Measurement of quasi-continuous single mode tuning at room temperature and with Peltier cooling.
  • Analysis of electro-optic and spectral properties as a function of segment currents.
  • Investigation of thermal crosstalk between laser segments.
  • Determination of spectral resolution in a gas absorption experiment.

Main Results:

  • Demonstrated quasi-continuous single mode tuning of 15 cm-1 at room temperature.
  • Achieved 25 cm-1 tuning range via temperature tuning at Peltier temperatures.
  • Observed a maximum peak output power of 600 mW at room temperature.
  • Quantified thermal crosstalk between laser segments.
  • Attained a spectral resolution better than 0.0078 cm-1 in gas absorption measurements.

Conclusions:

  • The developed shallow-etched DBR is an effective frequency selective element for single mode QCLs.
  • The lasers exhibit excellent tuning capabilities and high output power.
  • The high spectral resolution makes these lasers suitable for precise gas sensing applications.