【摘要】 提出使用布里渊光纤环形激光器产生的二阶Stokes光作为参考光测量超窄激光线宽的新方法.分析了布里渊光纤环形激光器的一阶和二阶Stokes光的线宽压缩特性,指出输出的二阶Stokes光线宽可以压缩到亚Hz量级.理论上分析了使用零线宽参考光的拍频法测量激光线宽的特点,结果表明参考激光为理想零线宽时,拍频频谱与待测激光频谱线型形状完全相同.最后指出该方法可以有效测量<100kHz的激光线宽,并且具有装置简单、测量精度高和测量波段宽的优点.更多还原

【Abstract】 A new method of measuring Ultra-narrow laser line-width using the second Stokes wave of Brillouin fiber ring laser as reference laser is proposed. The characteristic of line-width narrowing of the first and second Stokes wave in Brillouin fiber ring laser is analyzed, which shows line-width of the second Stokes wave could fall in the sub-Hertz domain. The characteristic of the method using a reference laser with zero line-width is theoretically analyzed, which shows the spectrum line-shape of beat is identical with that of the laser under tested. Further analysis shows that this method is suitable for the measurement of laser line-width below 100 kHz, with the advantages of simple set-up, high accuracy and a wide measurable waveband.更多还原