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利用1 550 nm光纤激光器搭建了一个同带泵浦环形腔掺铥光纤激光器,并对其光谱输出特性进行了研究。在1 550 nm激光泵浦下,1.6 m掺铥光纤自发辐射谱覆盖1 800~1 900 nm范围,3 d B带宽大于60 nm;通过在腔内插入隔离器,获得了线宽小于0.2 nm的激光输出,中心波长在1900 nm附近;进一步在腔内加入FP腔,获得了可调谐的窄线宽输出,光谱调谐范围达60 nm,覆盖从1 840~1 900 nm的光谱范围,激光线宽仅为0.07 nm。另外,在腔内使用通信波段用FP腔,同样获得了较宽调谐范围的窄线宽输出。输出光谱分为1 820~1 850 nm和1 865~1 915 nm两个区域,调谐范围共达80 nm。结合使用2 000 nm FP腔的可调谐光谱范围,该激光器在1 820~1 915 nm的范围都可以获得激光输出,与掺铥光线的自发辐射谱基本相符。
A 1 550 nm fiber laser was used to build a fiber-coupled pulsed fiber laser with a pump cavity. The spectral output characteristics were also studied. Under 1 550 nm laser pumping, the spontaneous emission spectrum of 1.6 m doped 铥 fiber covers the range of 1 800 ~ 1 900 nm and the bandwidth of 3 d B is greater than 60 nm. By inserting the isolator in the cavity, Laser output, the center wavelength of 1900 nm in the vicinity; further into the cavity FP cavity, obtained tunable narrow linewidth output, the spectral tuning range of 60 nm, covering the spectrum from 1 840 ~ 1 900 nm, the laser linewidth Only 0.07 nm. In addition, using the communication band FP cavity in the cavity also yields a narrow linewidth output with a wide tuning range. The output spectrum is divided into two regions of 1 820 ~ 1 850 nm and 1 865 ~ 1 915 nm, and the tuning range is up to 80 nm. Combined with the tunable spectral range of 2 000 nm FP cavity, the laser can obtain the laser output in the range of 1 820 ~ 1 915 nm, which is basically consistent with the spontaneous emission spectrum of doped 铥 ray.