Study of Two-Mirror Yb3+:YAG Crystal Fiber Ring Laser
Date Issued
2007
Date
2007
Author(s)
Huang, Yen-Lo
DOI
zh-TW
Abstract
Due to its simple energy level structure, there are no excited state absorption, concentration quenching, and etc. in Yb3+:YAG. Also, it has the potential for higher efficiency with its 8.6% low quantum defect. However, the quasi-three-level nature of Yb3+:YAG makes it more sensitive to increased temperature.
In order to increase surface-to-volume ratio and relieve the thermal problem, we applied a 1.33-mm-long and 250-μm-diameter Yb3+:YAG crystal fiber as the gain medium, which was grown with our own LHPG system, in the multi-pass ring cavity instead of bulk, 1.5×1.5 mm2 Yb3+:YAG. The achieved threshold was 497.1 mW, which was about 92 mW lower than that using 534-μm-diameter fiber.
In the past, the optimization procedure of the laser performance was tedious because when replacing mirror of different reflectance the laser cavity must be tuned again. And, the multiple laser outputs were not collected easily. In our new design, we use mirrors of high reflectance for the ring cavity and one beam splitter for dumping laser output. The leakage power for the cavity mirrors was only 3% of the power from the beam splitter and threshold was 584 mW.
Subjects
雙鏡式環形共振腔
環形雷射
Yb:YAG
晶體光纖
分光鏡
Two-mirror ring cavity
ring laser
crystal fiber
beam splitter
Type
thesis
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