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我们利用同步泵浦光纤喇曼环形激光器在1.396μm处得到195fs 的光脉冲,并利用时间-色散调谐技术在1.396μm附近实现了47nm 的波长调谐.我们采用1.313μm的 Nd:YLF 锁模脉冲泵浦,其喇曼光处于单模光纤的负色散区,利用孤子效应得到195fs 的光脉冲.实验中我们采用一台 Nd:YLF(Quantronix Model 4216d)激光器作泵浦源,输出波长为1.313μm,主动锁模时输出脉宽约50ps.泵浦光经一枚双色镜反射后耦合进光纤.测试中使用的单模光纤是普通通讯用单模石英光纤.其零色散波长在1.305μm,芯径约为9.5μm.由于喇曼效应的作用,在光纤中产生1.395μm左右的喇曼光.喇曼光从光纤出来后经透镜准直、延迟后穿过双色镜反馈回光纤,其中一部分被反射作为输出.用 PIN 来监测泵浦脉冲与喇曼光脉冲的同步情况,并调节延迟线达到同步泵浦的要求.
We use a synchronized pumping fiber Raman ring laser to obtain a 195 fs optical pulse at 1.396 μm and use a time-dispersion tuning technique to achieve a wavelength tuning of 47 nm around 1.396 μm. We use a 1.313 μm Nd: YLF mode-locked pulsed pump In the experiment, we use a Nd: YLF (Quantronix Model 4216d) laser as the pump source, the output wavelength is 1.313μm, Active pulse mode output pulse width of about 50ps. Pump light reflected by a dichroic mirror coupled into the optical fiber used in the test single-mode optical fiber communication is common mode single-mode silica fiber. The zero-dispersion wavelength of 1.305μm, core diameter About 9.5μm due to the Raman effect in the fiber to produce about 1.395μm Raman light Raman light from the fiber out of the lens through the lens after the delay through the dichroic mirror feedback back to the fiber, some of which are reflected As output. Use the PIN to monitor the synchronization of the pump pulse with the Raman light pulse and adjust the delay line to meet the requirement of a synchronous pump.