Optically pumped mode-locked InGaAsP lasers

Abstract
We report tunable cw mode-locked laser action from synchronously pumped InGaAsP lasers with an output power of 2 mW. Nearly bandwidth-limited pulses of 6-ps duration have also been obtained using a mechanically chopped pump beam. 2–5-μm-thick LPE quaternary layers lasing at 1.1 and 1.2 μm are longitudinally pumped by a Kr+ laser. Peak output powers of greater than 25 W, tunable over a 25-nm range, can be achieved. Unmode-locked operation has also been accomplished.