Borri S, Bartalini S, Galli I, Cancio P, Giusfredi G, Mazzotti D, Castrillo A, Gianfrani L, De Natale P
Istituto Nazionale di Ottica Applicata, CNR, Firenze, Italy.
Opt Express. 2008 Jul 21;16(15):11637-46. doi: 10.1364/oe.16.011637.
The frequency of a DFB quantum cascade laser (QCL) emitting at 4.3 microm has been long-term stabilized to the Lamb-dip center of a CO2 ro-vibrational transition by means of first-derivative locking to the saturated absorption signal. Thanks to the non-linear sum-frequency generation (SFG) process with a fiber-amplified Nd:YAG laser, the QCL mid-infrared (IR) radiation has been linked to an optical frequency-comb synthesizer (OFCS) and its absolute frequency counted with a kHz-level precision and an overall uncertainty of 75 kHz.
通过对饱和吸收信号进行一阶导数锁定，一个发射波长为4.3微米的分布反馈量子级联激光器（QCL）的频率已被长期稳定到二氧化碳转动-振动跃迁的兰姆凹陷中心。借助与光纤放大的Nd:YAG激光器的非线性和频产生（SFG）过程，该QCL的中红外（IR）辐射已与一个光学频率梳合成器（OFCS）相连接，其绝对频率已被精确到kHz级别，总体不确定度为75 kHz。
