Abstract

We report some of our recent work on the ps pulse bunch mid-IR laser output at 3.8 μm through the quasi-synchronized pump scheme. A modulated DBR LD with pulse repetition rate (PRR) of 138 MHz and pulse duration around 200 ps was applied as the seed laser source after its PRR was multiplied by 8 through four cascaded 2 by 2 couplers. The frequency multiplied seed laser was converted into the pulse bunch with the help of a fiber pigtailed acousto-optic modulator and then amplified in the final linearly polarized fiber power amplifier. The output of the fiber laser was directed to pump a PPMgLN –based optical parametric oscillator. Efficient parametric conversion was realized via the quasi-synchronized pump scheme with a maximum average output power of 7.5 W at 3.8 μm and the 1064 nm pump to the 3.8 μm idler conversion efficiency of 16%.

© 2015 Optical Society of America