Université de Neuchâtel

Gain characterization and passive modelocking of electrically pumped VECSELs

Pallmann, W. P ; Zaugg, C. A ; Mangold, Mario ; Wittwer, Valentin J ; Moench, H ; Gronenborn, S ; Miller, M ; Tilma, B. W ; Südmeyer, Thomas ; Keller, Ursula

In: Optics Express, 2012, vol. 20, no. 22, p. 24791-24802

Linear and nonlinear gain characterization of electrically pumped vertical external cavity surface emitting lasers (EP-VECSELs) is presented with spectrally resolved measurements of the gain and with gain saturation measurements of two EP-VECSEL samples with different field enhancement in the quantum-well gain layers. The spectral bandwidth, small-signal gain and saturation fluence of the devices...

Université de Neuchâtel

Low repetition rate SESAM modelocked VECSEL using an extendable active multipass-cavity approach

Zaugg, C. A ; Hoffmann, Martin ; Pallmann, W. P ; Wittwer, Valentin J ; Sieber, Oliver D ; Mangold, Mario ; Golling, Matthias ; Weingarten, K. J ; Tilma, B. W ; Südmeyer, Thomas ; Keller, Ursula

In: Optics Express, 2012, vol. 20, no. 25, p. 27915-27921

Ultrafast VECSELs are compact pulsed laser sources with more flexibility in the emission wavelength compared to diode-pumped solid-state lasers. Typically, the reduction of the pulse repetition rate is a straightforward method to increase both pulse energy and peak power. However, the relatively short carrier lifetime of semiconductor gain materials of a few nanoseconds sets a lower limit to the...