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论述了均匀加宽增益介质中利用净增益均衡原理同时输出双波长激光的可行性,使得双波长各自的损耗等于增益,抑制模式竞争,便可实现双波长输出。验证了上述原理,搭建的线型腔双波长掺镱光纤(YDF)激光器室温下可以实现单波长输出和双波长输出两种运转状态。单波长或者双波长输出时,转动体光栅角度,利用其分光谱和选波长的特性,均可使得波长分别在1013～1078nm的范围内调谐。双波长同时输出时,其线宽分别约为0.012和0.020nm,最大和最小波长间隔约为65.00和1.04nm。双波长间隔较小时,双波长对彼此的抑制影响较间隔大时更为明显。双波长输出功率均衡稳定,最大输出功率可达40.7mW。输出双波长时,该激光器可用于光子混频和拍频产生太赫兹辐射;输出单波长时,由于其波长可调谐的特性,该激光器可用作光学相干层析(OCT)的调谐光源。
The feasibility of using the principle of net gain equalization to output dual wavelength laser in homogeneous widening gain medium is discussed. The loss of dual wavelength is equal to the gain and the mode of suppressing mode can realize the dual wavelength output. The above principle is validated. The built-in linear dual-wavelength Ytterbium-doped fiber (YDF) laser can achieve both single-wavelength output and dual-wavelength output at room temperature. Single-wavelength or dual-wavelength output, the body grating angle rotation, the use of its sub-spectral and wavelength characteristics can be made, respectively, the wavelength tuning in the range of 1013 ~ 1078nm. When dual wavelengths are output simultaneously, the linewidths are about 0.012 and 0.020 nm respectively, and the maximum and minimum wavelength spacings are about 65.00 and 1.04 nm. When the two-wavelength interval is small, the suppressive effect of the two wavelengths on each other is more obvious than when the interval is large. Dual-wavelength output power balanced and stable, the maximum output power up to 40.7mW. The laser can be used for photon mixing and beat frequency generation of terahertz radiation when it is output at two wavelengths; it can be used as a tuning light source for optical coherence tomography (OCT) due to its wavelength tunable output when outputting a single wavelength.