Seed-injection Er:LuAG single-frequency, pulsed laser at 1650 nm

A 1650 nm seed-injection, single-frequency Er:LuAG pulsed laser with the double corner-cube-retroreflector (DCCR) structure has been demonstrated in this paper. In the total CCR structure (seed and slave laser), the maximum pulse energy of 2.15 mJ, with a pulse width of 225 ns under the pulse repetition frequency (PRF) of 200 Hz has been obtained, through the "ramp-hold-fire" injection-seeding technique. By utilizing the heterodyne technique, we have determined that the half-width pulse spectrum, which is 2.27 MHz. It is noteworthy that this marks the first successful realization of the 1650 nm single-frequency, Er:LuAG pulsed laser.