Plane-by-plane femtosecond laser inscription of first-order fiber Bragg gratings in fluoride glass fiber for in situ monitoring of lasing evolution
Plane-by-plane femtosecond laser inscription of first-order fiber Bragg gratings in fluoride glass fiber for in situ monitoring of lasing evolution
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DOI：
10.1364/oe.26.033305
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发表时间：
2018-12-10
期刊：
影响因子：
3.8
通讯作者：
Tokita, Shigeki
中科院分区：
文献类型：
--
作者：
Goya, Kenji;Matsukuma, Hiraku;Tokita, Shigeki
本文报道了在掺铒氟化物玻璃光纤中用飞秒激光刻写光纤布拉格光栅（FBG），用于2.8 μ m中红外波段的激光输出。从光纤光栅的反射率、波长向布拉格波长的跃迁以及中红外光纤激光器的输出功率等方面讨论了激光的演化。一阶和短（2.5毫米长）布拉格光栅表现出97%的反射率，因为激光诱导的折射率调制为1.1 × 10（-3）。这种调制足以使该系统的输出功率饱和。激光振荡器设计为在斜率为2799-2800 nm的大气窗口中产生激光。此外，该振荡器的效率是高达29.1%的发射泵浦功率在0.4-4.6 W的范围内，在激射波长为2799.7 nm。该振荡器还表现出0.12 nm的FWHM带宽。(C)根据OSA开放获取出版协议的条款，2018年美国光学学会
We report the femtosecond laser inscription of fiber Bragg gratings (FBGs) in an Er-doped fluoride glass fiber used for lasing at a mid-infrared wavelength of 2.8 mu m. The lasing evolution is discussed in terms of the FBG reflectivity, wavelength transition to the Bragg wavelength, and output power of the mid-infrared fiber laser. A first-order and short (2.5-mm-long) Bragg grating showed a reflectivity of 97%, because of a laser-induced index modulation of 1.1 x 10(-3). This modulation was sufficient to saturate this system's output power. The laser oscillator is designed to lase in the atmospheric window of 2799-2800 nm slope. Further, this oscillator's efficiency is as high as 29.1% for the launched pump power over the range of 0.4-4.6 W and at a lasing wavelength of 2799.7 nm. This oscillator also exhibited a FWHM bandwidth of 0.12 nm. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement