Experimental Studies on High Power Diode Pumped Q-Switched Double Clad Flower Shape Codoped Er3+/Yb3+Fiber Laser

Document Type : Original Article

Authors

1 Laser Photonics Research Group, Engineering Physics Dept., MTC, Cairo, Egypt.

2 Military Technical Institute, Cairo, Egypt.

Abstract

Abstract
A diode pumped acousto-optic Q-Switching Er3+:Yb3+co-doped single mode TEM 00 high power fiber laser has been reported, laser output average power in excess of 1.65 W was achieved for Q-switching at high repetition rates from 10 kHz to100 kHz. The shortest pulse duration obtained was 10 ns, giving a highest peak power of 9.8 kW and 98μJ energy per pulse, is the highest yet reported from any type of active Q-switched flower double clad fiber laser operating in low order mode. The pulse train with high pulse-to-pulse stability of 95% occurred at a range of high repetition rates up to100kHz with peak power of 0.4 kW, 40ns pulse width and 16μJ energy per pulse at 1550 nm for a launched pump power of 5W.Optical chopper Q-switching technique for Er3+:Yb3+co-doped fiber laser has been investigated, it was found that the narrowest pulse width of 35 ns with peak power of 15.5kW and energy per pulse 0.5mJ at pulse repetition frequency of 1 kHz. The pulse-to-pulse stability was moderate of 75% occurred at a range of high repetition rates. A comparison between optical chopper Q-switching technique and acousto-optic Q-switching has been done at repetition rate of 20 kHz, the reported high energy per pulse, pulse width and the average power of an optical chopper Q-switching technique are greater than that of acousto-optic Q-switching but the pulse width is narrower and so the high peak power of an acousto-optic Q-switching pulse is greater than that of optical chopper Q-switching technique at high repetition rates of up to 100 kHz.

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