Room Temperature Lasing at Blue Wavelengths in Gallium Nitride Microcavities
Takao Someya,
1*
Ralph Werner,
2
Alfred Forchel,
2
Massimo Catalano,
3
Roberto Cingolani,
4
Yasuhiko Arakawa
1
Lasing action has been demonstrated at blue wavelengths
in vertical cavity surface-emitting lasers at room temperature. The microcavity was formed by sandwiching indium gallium nitride multiple quantum wells between nitride-based and oxide-based quarter-wave reflectors. Lasing action was observed at a wavelength of 399 nanometers under optical excitation and confirmed by a narrowing of the
linewidth in the emission spectra from 0.8 nanometer below threshold to
less than 0.1 nanometer (resolution limit) above threshold. The result
suggests that practical blue vertical cavity surface-emitting lasers
can be realized in gallium-nitride-based material systems.
1 Institute of Industrial Science, University of Tokyo,
7-22-1 Roppongi, Minato-ku, Tokyo 106-8558, Japan.
2 Lehrstuhl für Technische Physik,
Universität Würzburg, Am Hubland, 97074 Würzburg,
Germany.
3 Consiglio Nazionale delle Ricerche,
Istituto Studio Materiali per l'Elettronica, Universita' di Lecce,
via Arnesano 73100 Lecce, Italy.
4 Istituto
Nazionale Fiscica Materia, Universita' di Lecce, Dipartimento
Ingegneria Innovazione, via Arnesano 73100 Lecce, Italy.
*
To whom correspondence should be addressed. E-mail:
someya{at}iis.u-tokyo.ac.jp
