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Mode-locked operation has been achieved in a CW pumped Cr/sup 3+/:LiSr/sub 0.8/Ca/sub 0.2/AlF/sub 6/ laser. Pulses of 150 fs duration were directly generated from the actively mode-locked laser. A CW krypton laser operating with 1 W in the red was used to pump the 15 mm long crystal.<<ETX>>
The lateral spreading of photocarriers in a multiple quantum well hetero nipi structure is reported. The physical behaviour of the carriers is explained by a simple model. The results indicate the importance of decreasing the lateral device dimensions in order to obtain a large absorption change and a corresponding large change in the refractive index at low power levels.<<ETX>>
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