Solar-pumped fiber laser without concentrating the sunlight

我们瞄准的是太阳能泵浦的激光，而不是聚集太阳光。掺钕玻璃纤维被包装在一个前窗为二向色性的盒子中，盒子中装有增感染料溶液。通过照射相当于20倍集中太阳光的白光，观察到43db/km的正增益。自然光的预期增益为2.2db/km，低于光纤的固有损耗。出乎意料的低增益是由于盒子侧壁的低反射率，以及染料溶液的泵浦波长吸收。

We aim a solar-pumped laser without concentrating the sunlight. A Nd-doped glass fiber is packed in a box whose front window is dichroic, and it contains sensitizer dye solution. By irradiating a white light equivalent to a 20 times concentrated solar light, a 43dB/km of positive gain is observed. Expected gain by the natural sunlight is 2.2dB/km, and it is below the intrinsic loss of the fiber. The unexpected low gain is due to the low reflectivity of the sidewall of the box, and pump wavelength absorption of the dye solution.