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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

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Published on: February 28, 2016

Bistability in bosonic terahertz lasers.

A A Pervishko¹, T C H Liew, A V Kavokin

¹Division of Physics and Applied Physics, Nanyang Technological University 637371, Singapore.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|February 8, 2014

Summary

We theoretically demonstrate terahertz (THz) lasing using two-photon excitation in a quantum well microcavity system. Nonlinearity enables bistability and hysteresis, paving the way for ultrafast THz switches.

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Area of Science:

Quantum optics
Solid-state physics
Photonics

Background:

Terahertz (THz) generation is crucial for spectroscopy and imaging.
Quantum wells offer tunable optical properties for light-matter interactions.

Purpose of the Study:

To theoretically investigate THz lasing in a quantum well microcavity system.
To explore the role of two-photon excitation of dark excitons.
To analyze system stability and nonlinear phenomena.

Main Methods:

Theoretical modeling of a quantum well inside coupled optical and THz cavities.
Analysis of two-photon excitation of 2p dark exciton states.
Coherent pumping and microcavity parameter variation.

Main Results:

Demonstrated THz lasing via two-photon absorption.
Identified bistability and hysteresis in THz output.
Analyzed system stability under varying microcavity parameters.

Conclusions:

Two-photon absorption nonlinearity is key for THz lasing control.
The proposed system can exhibit bistability and hysteresis.
Potential for developing ultrafast all-optical THz switches.