Unlike conventional interband semiconductor lasers, the scientists said their quantum cascade laser is an intersubband device requiring only electrons to operate.
Unlike conventional interband semiconductor lasers, the scientists said their quantum cascade laser is an intersubband device requiring only electrons to operate. |
The Northwestern University researchers, led by Professor Manijeh Razeghi, said their accomplishment is particularly attractive for infrared countermeasures -- a way of misguiding incoming missiles to protect commercial and military aircraft.
Unlike conventional interband semiconductor lasers, the scientists said their quantum cascade laser is an intersubband device requiring only electrons to operate.
Razeghi's team demonstrated the ridge width of a broad-area quantum cascade laser can be increased up to 400 microns, without suffering from filiamentation -- a phenomenon that limits the ridge width of conventional broad-area semiconductor lasers. As a result, the scientists said room temperature peak output power as high as 120 watts was obtained from a single device, which is up from 34 watts only a year ago.
The complex research appears in the journal Applied Physics Letters.
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