Denis Thomas, Hahn Sven, Mebben Sandra, Wilhelm Ralf, Kolleck Christian, Neumann Jörg, Kracht Dietmar
Laser Zentrum Hannover e. V., Hollerithallee 8, D-30419 Hannover, Germany.
Appl Opt. 2010 Feb 10;49(5):811-6. doi: 10.1364/AO.49.000811.
We report on a compact Nd:YAG amplifier emitting a maximum pulse energy of 14 mJ. By amplifying a passively Q-switched oscillator (M(2)<1.2) a good beam quality of M(2) approximately 1.7 was achieved. The amplifier is diode pumped by an 8 bar diode stack of 800 W power and a nonimaging optic. This optic homogenizes the pump light and transfers it into a 5 mm diameter core doped rod with a centrally neodymium doped region of 3 mm and a samarium doped YAG cladding. We show that this cladding reduces parasitic effects in the laser rod compared to an undoped YAG cladding. Finally, we compare the compact amplifier with an amplifier, which is mode selectively pumped by a fiber coupled pump diode.
我们报道了一种紧凑型钕钇铝石榴石（Nd:YAG）放大器，其发射的最大脉冲能量为14 mJ。通过放大一个被动调Q振荡器（M²<1.2），实现了约为1.7的良好光束质量M²。该放大器由一个功率为800 W的8棒二极管堆栈和一个非成像光学器件进行二极管泵浦。这种光学器件使泵浦光均匀化，并将其传输到一个直径为5 mm的芯部掺杂棒中，该棒具有一个3 mm的中心钕掺杂区域和一个钐掺杂的钇铝石榴石包层。我们表明，与未掺杂的钇铝石榴石包层相比，这种包层减少了激光棒中的寄生效应。最后，我们将该紧凑型放大器与一个由光纤耦合泵浦二极管进行模式选择性泵浦的放大器进行了比较。
