Quantum Cascade Laser

American Association for the Advancement of Science (AAAS) - Tập 264 Số 5158 - Trang 553-556 - 1994
Jérôme Faist1, Federico Capasso1, Deborah L. Sivco1, Carlo Sirtori1, Albert L. Hutchinson1, Alfred Y. Cho1
1AT & T Bell Laboratories, Murray Hill, NJ 07974, USA

Tóm tắt

A semiconductor injection laser that differs in a fundamental way from diode lasers has been demonstrated. It is built out of quantum semiconductor structures that were grown by molecular beam epitaxy and designed by band structure engineering. Electrons streaming down a potential staircase sequentially emit photons at the steps. The steps consist of coupled quantum wells in which population inversion between discrete conduction band excited states is achieved by control of tunneling. A strong narrowing of the emission spectrum, above threshold, provides direct evidence of laser action at a wavelength of 4.2 micrometers with peak powers in excess of 8 milliwatts in pulsed operation. In quantum cascade lasers, the wavelength, entirely determined by quantum confinement, can be tailored from the mid-infrared to the submillimeter wave region in the same heterostructure material.

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American Association for the Advancement of Science (AAAS)

Tập 264 Số 5158

553-556

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