Volume 14, Issue 1 (Winter-Spring 2020)                   IJOP 2020, 14(1): 75-84 | Back to browse issues page

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1- Department of plasma and nuclear fusion, Nuclear science technology research institute, North Kargar, Tehran, Iran, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran
2- Department of plasma and nuclear fusion, Nuclear science technology research institute, North Kargar, Tehran, Iran
3- Department of Physics, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran
Abstract:   (940 Views)
In this paper, the mode structure and time behavior of a LED-pumped Ce:Nd:YAG laser have been studied. Four blue LED bars with total 128 LEDs at 460 nm are utilized to pump a 3 mm diameter laser rod. Using a Cr4+:YAG passive optical switch with 96% initial transmission, and a low loss stable optical resonator and 0.7 J pumping energy, a single 17 micro-joules Q-switched laser pulse with 240 ns pulse-width and nearly TEM00 mode profile was produced. By increasing the pumping energy Ep up to 0.8 J, the mode structure remained intact. Further increasing of Ep, the laser mode changed to TEM10. Numerical calculations show that the central high gain area of the laser rod and saturation mechanism of the passive Q-switch behaves like as a soft aperture to enforce the laser resonator to oscillate on a low order transverse mode. For laser free-running, the TEM00 mode has not been achieved and the optical resonator produced high order transverse mode patterns.
Full-Text [PDF 463 kb]   (399 Downloads)    
Type of Study: Applicable | Subject: Special
Received: 2019/09/2 | Revised: 2019/12/6 | Accepted: 2020/08/3 | Published: 2020/09/10

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