We study thermally induced phase distortions of laser radiation in active elements in the form of thin rods of square cross section. The absence of aberrations and beam quality deterioration is demonstrated for these elements, due to which they can be used along with rods having a round cross section, differing from the latter by much higher technological efficiency of fabrication and mounting in the cooling system. A concept of compact and reliable multichannel solid-state amplifier based on such active elements is proposed, which allows one to use a multichannel fibre laser as a master system.

中文翻译：

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用于多通道激光放大器的方形截面细棒形式的有源元件

我们研究了方形横截面细棒形式的有源元件中激光辐射的热致相位畸变。这些元件没有像差和光束质量恶化，因此它们可以与具有圆形横截面的棒一起使用，与后者的不同之处在于在冷却系统中制造和安装的技术效率要高得多。提出了一种基于这种有源元件的紧凑可靠的多通道固态放大器的概念，它允许使用多通道光纤激光器作为主系统。