Very compact tunable solid-state laser utilizing a thin-film organic semiconductor.
Optically pumped organic semiconductor lasers are fabricated by evaporation of a thin film of tris(8-hydroxyquinoline) aluminum (Alq(3)) molecularly doped with a laser dye on top of a polyester substrate with an embossed grating structure. We achieve low-threshold, longitudinally monomode distributed-feedback laser operation. By varying the film thickness of the organic semiconductor film, we can tune the wavelength of the surface-emitting laser over 44 nm. The low laser threshold allows the use of a very compact all-solid-state pump laser ( approximately 10 cm long). This concept opens up a way to obtain inexpensive lasers that are tunable over the whole visible range.
Riechel
S
S
Lemmer
U
U
Feldmann
J
J
Berleb
S
S
Mückl
A G
AG
Brütting
W
W
Gombert
A
A
Wittwer
V
V