一种新的阵列半导体激光器侧面耦合双包层光纤的方法研究

Analysis and computation of a new scheme of double-cladding fiber side-coupling of laser diode array

V型槽侧面耦合是目前双包层光纤泵浦光耦合的方法之一。本文提出了一种新的制作V型槽进行侧面泵浦的工艺方法,即在光纤预制棒上进行刻槽,然后对侧面已刻出一长条V型槽的预制棒进行拉丝。针对这种新的侧面泵浦方法的耦合效率进行了理论的分析和计算。通过对交迭场的积分求出这种新的侧面泵浦方法的耦合效率,并对激光二极管阵列距离V型槽的位置以及V型槽所开的角度进行了优化。为随后的实验提供了理论依据。

A new scheme of double - cladding fiber side - coupling of laser diode array is proposed. A V - groove was fabricated on the lateral of the perform. A theoretical formula for the coupling efficiency in the absence of beth angular and transverse misalignments was presented. Based on the assumption that beth the fundamental mode field of the laser beam and the fiber was approximated by a Guassian beam, a maximum coupling efficiency of 82% was predicted by the theory when the distance between the laser and the fiber was 18μn. For a fixed distance between the laser and the fiber, a maximum coupling efficiency was achieved when the angle of the v - groove was 4 - 5＇. And the coupling efficiency decreased rapidly when the angle was above 10°.