High power spiral cavity quantum cascade superluminescent emitter

Area of Science:

• Optoelectronics
• Quantum Optics
• Semiconductor Devices

Background:

• Quantum Cascade (QC) lasers are crucial for mid-infrared (MIR) applications.
• Enhancing superluminescence (SL) power is key for developing MIR light sources.
• Compact device design is essential for practical applications.

Purpose of the Study:

• To investigate the impact of spiral cavity design on MIR superluminescence power.
• To optimize Quantum Cascade devices for increased SL output.
• To explore the potential of compact, long spiral cavities for MIR superluminescence.

Main Methods:

• Fabrication of Quantum Cascade devices with integrated spiral cavities (8 mm and 12 mm lengths).
• Characterization of superluminescence power and spectral properties.
• Temperature-dependent measurements at 250 K.

Main Results:

• Achieved up to ~57 mW of superluminescence power at 250 K.
• Utilized compact, long spiral cavities to enhance SL power.
• Observed a Gaussian emission spectrum with a 56 cm(-1) FWHM and ~107 μm coherence length.

Conclusions:

• Compact, long spiral cavities are effective in boosting MIR superluminescence power from Quantum Cascade devices.
• The developed devices show potential for high-power MIR applications.
• The results demonstrate a viable approach for engineering MIR superluminescent sources.