Characterization of Yb-doped ZBLAN fiber as a platform for radiation-balanced lasers

• 作者: ARASH MAFI ARMAN ALLAHVERDI BEHNAM ABAIE ESMAEIL MOBINI MOSTAFA PEYSOKHAN
• 来源期刊: 光子学研究:英文版
• 学科: 工学
• 关键词: FIBER PUMP viable
• 年，卷（期）: 2020,（2）
• 页码范围: 202-210
• 页数: 9页
• 分类号: TN2

摘要

Recent advances in power scaling of fiber lasers are hindered by the thermal issues,which deteriorate the beam quality.Anti-Stokes fluorescence cooling has been suggested as a viable method to balance the heat generated by the quantum defect and background absorption.Such radiation-balanced configurations rely on the availability of cooling-grade rare-earth-doped gain materials.Herein,we perform a series of tests on an ytterbium-doped ZrF4–BaF2–LaF3–AlF3–Na F(ZBLAN)optical fiber to extract its laser-cooling-related parameters and show that it is a viable laser-cooling medium for radiation balancing.In particular,a detailed laser-induced modulation spectrum test is performed to highlight the transition of this fiber to the cooling regime as a function of the pump laser wavelength.Numerical simulations support the feasibility of a radiation-balanced laser,but they highlight that practical radiation-balanced designs are more demanding on the fiber material properties,especially on the background absorption,than solid-state laser-cooling experiments.