摘要
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。
That homogeneously broadened fiber laser, which can output two wavelengths simultaneously, is demonstrated by using net gain equalization method which makes each wavelength＇s loss equals to gain in order to suppress mode competition. This linear-cavity Yb-doped fiber （YDF） laser realizes simultaneously single wavelength and two wavelengths stable output with linewidth of 0. 012 and 0. 020 nm respectively at room temperature. Each of the two wavelengths can be tuned approximately from 1013 to 1078 nm by the spectra separation and charateristics of selected wavelengths. The maximum and minimum wavelength spaces are 65.00 and 1.04 nm. The suppression effect to each other is stronger with smaller wavelength spacing. The output power of each wavelength equilibrates with the total maximum output power is 40.7 mW. This tunable two wavelengths laser can generate THz based on the beat frequency and also can be used as the optical source of optical coherence tomography （OCT） due to its tunable wavelength.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2011年第11期19-26,共8页
Chinese Journal of Lasers
关键词
激光器
双波长
波长调谐
增益均衡
掺镱光纤
lasers
two wavelengths
tunable wavelength
gain equalization
Yb-doped fiber
