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Bidirectional Semiconductor Laser.

Gmachl¹, Tredicucci, Sivco

¹Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, NJ 07974, USA.

Science (New York, N.Y.)

|October 26, 1999

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This study introduces a novel semiconductor laser that emits two distinct mid-infrared wavelengths by switching bias polarity. This dual-wavelength capability has significant potential for trace gas analysis and remote sensing applications.

Area of Science:

Optoelectronics
Semiconductor Physics
Laser Technology

Background:

Semiconductor lasers typically operate under a single bias polarity.
Achieving multiple, independently tunable wavelengths from a single laser structure is challenging.
Mid-infrared lasers are crucial for molecular spectroscopy and sensing.

Purpose of the Study:

To demonstrate a semiconductor laser capable of operating under both positive and negative bias.
To achieve the emission of two distinct wavelengths from a single quantum cascade laser (QCL) structure.
To explore the potential of this dual-wavelength laser for applications in trace gas analysis.

Main Methods:

Fabrication of a quantum cascade laser with a specially designed active region.

Related Experiment Videos

Operation of the QCL under both positive and negative bias voltages.

Characterization of emitted wavelengths and their independent excitation.

Analysis of the laser's performance for differential absorption spectroscopy.

Main Results:

Successfully operated a semiconductor laser under both positive and negative bias.
Generated two distinct wavelengths (6.3 and 6.5 micrometers) in the mid-infrared spectrum from a single QCL.
Demonstrated independent excitation and temporal separation of the two wavelengths.
Confirmed the functional behavior of the active region as two different laser materials based on bias polarity.

Conclusions:

A novel dual-polarity, dual-wavelength semiconductor laser has been developed.
This technology offers a new approach for generating multiple wavelengths from a single device.
The laser shows promise for advanced applications in remote sensing and trace gas analysis using techniques like differential absorption spectroscopy.