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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

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Published on: December 18, 2015

Photon number distributions from a diode laser.

Georgios Roumpos¹, Steven T Cundiff

¹JILA, University of Colorado & National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA.

|March 5, 2013

Summary

This summary is machine-generated.

Researchers studied diode laser light crossing the threshold using balanced homodyne detection. They found excess light noise above threshold, indicating emission from nonlasing modes, not predicted by standard laser models.

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Area of Science:

Quantum Optics
Laser Physics
Semiconductor Devices

Background:

Diode lasers are crucial light sources.
Understanding laser behavior near threshold is key for applications.
Semiclassical models often simplify laser dynamics.

Purpose of the Study:

Characterize diode laser light emission.
Investigate deviations from semiclassical models near threshold.
Identify sources of excess noise in diode lasers.

Main Methods:

Balanced homodyne detection.
Measurement of second-order correlation function g(2).
Reconstruction of photon number distributions.

Main Results:

Measured g(2) exceeded semiclassical predictions above threshold.
Photon number distributions revealed emission from nonlasing modes.
Increased light noise at higher currents suggested mode competition or partition noise.

Conclusions:

Semiclassical single-mode laser models are insufficient near threshold.
Nonlasing mode emission significantly impacts laser output.
Complex noise mechanisms arise with increased diode laser pumping.