In this paper a Xenon-lamp-pumped four rods pulsed Nd:YAG laser is presented. The influence of offset angle of
Nd:YAG rods and thermal stable regions in the resonator have been analyzed theoretically, and tolerance of offset angle
and is given. A plane-plane symmetrical resonator has been used in the experiment, and the distance between two
neighbor rods is two times of that between the mirrors and rods. While input electric power is 58 kW and the duty cycle
is 17%, an output laser with an average power of 2026 W, a peak power of 11.9 kW, maximum single pulse energy of 60
J and a beam parameters product of 24.5 mm×mrad has been obtained. The electro-optical conversion efficiency is
3.49 %, and instability of the laser is less than 2 %.
This paper introduces a novel kind of E-O Q-switched Nd:YVO4 compact laser with ultra-narrow pulse width. In this
paper, the general equations describing Q-switched laser operation are given and the factors about cavity length, laser
gain medium, the loss inner resonator and pump energy to influence the laser pulse width are analyzed theoretically. These parameters greatly optimized experiment. The fiber-coupled laser-diode end-pumped laser we developed
simplifies the conventional structure of E-O Q-switched lasers. The cavity length is effectively reduced to 19mm to narrow the pulse width. The pulse width of 1.049ns is obtained and the single pulse energy reaches to 0.32mJ. This 1
nanosecond laser has the advantage in reliable and outstanding performance with simplified structure. Most importantly, we investigated the performance of an innovative RTP crystal in the Q-switched laser with high repetition frequency. It was experimentally proven that this narrow pulse width laser can operate with high repetition frequency because of the
novel Q-switched crystal RTP with great performance. Both theoretical analysis and experiment data demonstrate that sub-nanosecond pulses can also be produced with E-O Q-switching technique. Thus, this technique can be widely applied.
A method computing the absorption efficiency with the difference between pump power entering the thin disk and pump
power transmitted through the disk is introduced. Compared with directly computing the absorbed power, the method
presented here needs much less computation to achieve the same accuracy, making it possible to compare much more
absorption efficiency values at higher accuracy with a few parameters varied within certain ranges. Nonabsorption loss
values were calculated with absorption coefficient, array distance and round disk radius varied within certain ranges.
Results of calculation showed that the nonabsorption loss generally increases with increasing array distance, decreases
with increasing round disk radius and decreases with increasing absorption coefficient. The method introduced by this
paper presents a theoretical reference for the optimal design of thin disk lasers.