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利用半导体可饱和吸收镜(SESAM)和光纤环形镜(FLM)分别作为腔镜,实现了线形腔结构的全光纤掺镱激光器。通过调节偏振控制器(PC)和抽运功率得到了调Q、调Q锁模、连续锁模、二次谐波、三次谐波、多波长等多种输出状态。其中连续锁模状态可实现开机自启动,脉冲宽度31 ps,单脉冲能量40 pJ,重复频率19.3 MHz,中心波长1030.8 nm,光谱带宽2.3 nm。多波长输出信号中心波长在1033 nm左右,波长间隔及波长数随抽运功率和PC状态发生变化。最大抽运功率(420 mW)时,可得到最小平均波长间隔约0.11 nm。实验中得到10 dB光谱范围内最大波长数为35,此时3 dB范围内对应的波长数为34。
A full-fiber Ytterbium-doped laser with linear cavity structure is realized by using SESAM and FLM respectively as a cavity mirror. By adjusting the polarization controller (PC) and pumping power, a variety of output states such as Q-switching, Q-switched mode locking, continuous mode locking, second harmonic, third harmonic and multiwavelength are obtained. Among them, the continuous mode-locked state can be switched on and off with a pulse width of 31 ps, a single pulse energy of 40 pJ, a repetition frequency of 19.3 MHz, a center wavelength of 1030.8 nm and a spectral bandwidth of 2.3 nm. Multi-wavelength output signal center wavelength of about 1033 nm, wavelength spacing and wavelength with the pump power and PC state changes. At the maximum pump power (420 mW), a minimum average wavelength separation of about 0.11 nm is achieved. In the experiment, the maximum wavelength in the 10 dB spectral range is 35, and the corresponding wavelength in the 3 dB range is 34.