Yiping Zhou

Investigation of the irradiation effect on erbium-doped fiber amplifiers composed by different density erbium-doped fibers

Two erbium-doped fibers (EDFs) with different densities, which can make the erbium-doped fiber amplifier (EDFA) achieve the same output power, have been irradiated by 60Co at the same rate and same total dose. In addition, the irradiation effect on EDFA composed by different density EDFs is firstly analyzed in this paper. The experimental results indicate that, considering the length of EDF, the high density EDF can make the EDFA deteriorate less than the low that in the irradiation environment. Furthermore, the small change of the central wavelength and the half-wave width also confirm that the irradiation effect on EDFA chiefly introduces the transmission loss, but the physical mechanics of EDFA is not changed by the irradiation. The experimental results and conclusions will be a good reference for EDFA designers who are trying to apply the EDFA in an irradiation environment.

High efficiency 878.6nm LD end-pumped pulse burst Nd:YVO4 laser

A high-efficiency, high-repetition-rate burst-mode 1064 nm laser under pulsed 878.6 nm laser diode pumping is demonstrated. Pulses at repetition rates ranging from 10 kHz to 100 kHz are produced during the time period of 1 ms pumping duration by using an acousto-optical Q-switch. The maximum pulse burst energy of 44 mJ at 10 kHz is obtained at the incident pump power of 108.5 mJ, yielding an optical-to-optical efficiency of 40.5%. The shortest pulse width at 10 kHz is 9.4 ns at the maximum pump energy of 108.5 mJ. The peak powers are estimated to be ~468.1 kW and 30.1 kW at 10 kHz and 100 kHz in the burst-mode oscillator.

100 kHz, 3.1 ns, 1.89 J cavity-dumped burst-mode Nd:YAG MOPA laser

We demonstrated a cavity-dumped burst-mode 1.06 μm side-pumped Nd:YAG laser and its dual-stage dual-pass amplified laser performance. The cavity dumping process has been theoretically studied and the output performance has been experimentally investigated. At the pumping duration of 2 ms and pumping frequency of 10 Hz, burst energy, peak power and pulse width of the amplified laser reached 1.89 J, 2.87 MW and 3.1 ± 0.3 ns, respectively, at the Q-switch repetition rate of 100 kHz. The maximum energy extraction efficiency reaches to 30%.

Stable 500kHz, 1ms, 40mJ pulse-burst GdVO4/Nd:GdVO4 laser Oscillator

A stable pulse-burst GdVO4/Nd:GdVO4 laser oscillator with repetition rate up to 500kHz is demonstrated by use of a pulsed diode-laser of Stabilized Wavelength 879nm as the pump source. While the pulsed 879nm LD was operated at the repetition rate of 100Hz and the pump duration was 1ms, the different output characteristics of pulse-burst GdVO4/Nd:GdVO4 laser were obtained by adjusting the repetition rate of A-O Q-switch. When the total pump energy was 120mJ, the pulse number of 100, 200 and 500, the burst energy of 25mJ, 35mJ and 40mJ, the pulse width of 8.5ns, 12ns and 27ns were achieved at repetition rate of 100kHz, 200kHz and 500kHz, respectively. The relative single pulse energies were reached to 250μJ at 100kHz, 175μJ at 200kHz and 80μJ at 500kHz. The peak powers were reached to 29.4kW at 100kHz, 14.6kW at 200kHz and 3.0kW at 500kHz. The M2 factor was measure to 1.4.