The experimental study of passively Q-switched, LED-pumped Ce:Nd:YAG laser is reported. The active medium is a 3 mm diameter laser rod with 60 mm length; it is optically pumped with four segments of blue LEDs at 460 nm, with each segment consisting of 32 single LEDs. The 14 cm length optical resonator with 2 dielectric mirrors and the reflectivity of 99 and 93 percent at 1064 nm produced more than 200 micro-joules laser spikes at the free-running mode of operation. By using a passive optical switch with 96% initial transmission and 0.6 J electrical pumping energy, the single Q-switch (QS) laser pulse with 240 ns pulse-width and 17 micro-joules optical energy was produced. By increasing the pumping energy to 1.2 J, two nearly similar QS laser pulses were generated. Moreover, we have proposed a method for decreasing the pulse-width and increasing the energy of single QS laser pulse that is based on controlling the pumping rate by shaping the current of LEDs


1. J Bhardwaj, G Guth, J M Cesaratto, O B Shchekin, W A Soer, W Götz, R Bonné, Z F Song, and J Breejen, Devices and Applications for Solid State Lighting XXI (2017) 1012417.
2. A Barbet, F Balembois, A Paul, J P Blanchot, A L Viotti, J Sabater, F Druon, and P Georges, Opt. Lett. 39 (2014) 6731.
3. B Villars, E S Hill, and C G Durfee, Opt. Lett. 40 (2015) 3049.
4. K Y Huang, C K Su, M W Lin, Y C Chiu, and Y C Huang, Opt. Express 24 (2016) 12043.
5. J Chen and J N Chen, Optical Review 13, 6 (2006) 427.
6. C Y Cho, C C Pu, K W Su, and Y F Chen, Opt. Lett. 42, 12 (2017) 2394.
7. P Pichon, A Barbet, D Blengino, P Legavre, T Gallinelli, F Druon, J P Blanchot, F Balembois, S Forget, S Chénais, and P Georges, Optics and Laser Technology 96 (2017) 7.
9. M Tarkashvand, A H Farahbod, and S A Hashemizadeh, Laser Physics 28 (2018) 055801.
10. Y Kalisky, A Ben-Amar Baranga, Y Shimony, and M R Kokta, Optical Materials 8 (1997) 129.
11. W Koechner, “Solid-State Laser Engineering”, 6 th Edition, Chap.8, Springer (2006).
12. A H Farahbod and F Tahsildaran Fard, Iranian Journal of Physics Research 11, 2 (2011) 117.
13. X Zhang, S Zhao, Q Wang, Q Zhang, L Sun, and S Zhang, IEEE Journal of Quantum Electron. 33, 12 (1997) 2286.
14. J Dong, Optics Communications 226 (2003) 337.

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