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A detailed QD-SESAM growth study enabled the first modelocking of a VECSEL with similar spot size on gain and antiresonant SESAM. Antiresonant designs can strongly improve MIXSELs, a novel type of ultrafast integrated VECSELs.
Two microwave signals of different frequencies are used to directly modulate the top and bottom cavity of a coupled dual-cavity VCSEL. Signal mixing is observed from the laser output which can be engineered by varying the DC biases to the two cavities.
We report the first entirely quantum-dot-based SESAM-modelocked VECSEL, using quantum-dot layers for gain and absorber. We obtain 22 mW average output power at 1053 nm wavelength in 10-ps pulses with 2.54 GHz repetition rate.
We will discuss extraordinary properties of a single-layer one-dimensional high contrast grating (HCG). Tunable HCG-VCSELs are fabricated with 8000 times size reduction in the tunable mirror size and 160 times improved tuning speed of 63 ns.
Double sided pumping of an Yb:YAG planar waveguide laser is is shown to improve pump absorption and uniformity to give 230 W output using cylindrical mirror waveguide resonator.
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