Laser diode structures with a saturable absorber for high-energy picosecond optical pulse generation by combined gain-and Q-switching

作者：Ryvkin B S; Avrutin E A^*; Kostamovaara J E K; Kostamovaara J T

来源：Semiconductor Science and Technology, 2017, 32(2): 025015.

DOI：10.1088/1361-6641/32/2/025015

• semiconductor lasers
• gain switching
• optical radars

The performance of gain-switched Fabry-Perot asymmetric-waveguide semiconductor lasers with a large equivalent spot size and an intracavity saturable absorber was investigated experimentally and theoretically. The laser with a short (similar to 20 mu m) absorber emitted high-energy afterpulse-free optical pulses in a broad range of injection current pulse amplitudes; optical pulses with a peak power of about 35Wand a duration of about 80 ps at half maximum were achieved with a current pulse with an amplitude of just 8 A and a duration of 1.5 ns. Good quality pulsations were observed in a broad range of elevated temperatures. The introduction of a substantially longer absorber section leads to strong spectral broadening of the output without a significant improvement to pulse energy and peak power.

• 出版日期2017-2