نشریه انجمن اپتیک و فوتونیک ایران

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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 E_p up to 0.8 J, the mode structure remained intact. Further increasing of E_p, 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.

     

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