ABSTRACT

We report the basic spectroscopic properties of a home-made holmium-aluminum-germanium co-doped silica fiber, designed for laser applications. We present the ground-state and excited-state absorption spectra of the fiber along with the up-conversion emission spectrum under laser action, which served for making an energy levels’ diagram of Ho³⁺ ion. We discuss the ways to assess the kinetics of Ho³⁺ 2-µm fluorescence, focusing on measuring fluorescence lifetime from ⁵I₇ level and non-radiative decay time from ⁵I₆ level. The simple analytical formulae, applicable for fitting of the fluorescence decay curve, are derived, which can be useful for precise modeling of holmium-doped fiber lasers.

摘要

我们报告了专为激光应用设计的自制home-铝-锗-共掺杂石英纤维的基本光谱特性。我们介绍了光纤在激光作用下的基态和激发态吸收光谱以及上转换发射光谱，这些光谱用于制作Ho ³⁺离子的能级图。我们讨论以评估何的动力学方式³⁺ 2-μm的荧光，着眼于测量荧光寿命从⁵我₇级和非辐射衰减时间从⁵我₆水平。推导了适用于荧光衰减曲线拟合的简单分析公式，该公式可用于精确建模掺-光纤激光器。