Magnetic Resonance by Optical Means

我们利用光学手段进行了各种新型的磁共振实验，观察到了Cs和Na原子基态在两组光脉冲串激发下产生的同步量子拍频回波。这些是通过纯光学手段获得的电子自旋回波。D_1跃迁用于激发和检测。Cs实验使用的是半导体激光器。信号是从探测光的法拉第旋转中探测到的。测量了均匀弛豫时间，用线偏振光周期激发产生了Cs基态的m=2相干态，并观察到与之相关的自由感应衰变(FID)信号。用光学技术测量了BINIL和tm^&lt；2+&gt；：SrF_2晶体的自旋晶格驰豫时间(-10 ns)和1：1交叉弛豫时间，发现了Pr^&lt；3+&gt；：LaF_3的光学烧孔、光子回波、光折变和喇曼外差信号。首次从实验上证实了LaF_3晶体的孪晶。发现了光学辐照对核磁共振自旋回波信号的增强和核磁共振横向弛豫时间的反常延长。

We performed various new types of magnetic resonance experiment by optical means.Synchronized quantum beat echoes produced by the excitation with two sets of light pulse trains were observed for the ground state of Cs and Na atoms. These are the electron spin echoes obtained by purely optical means. D_1 transitions were used for the excitation and the detection. Diode lasers were used for the Cs experiment. Signals were detected form the Faraday rotation of the probe light. Homogeneous relaxation times were measured.By using periodic excitation with linearly polarized light we generated m=2 coherences in the ground state of Cs and observed free induction decay (fid) signals associated with them. We also demonstrated that the sign of the g-factor can be determined optically by using these signals.Short spin lattice relaxation times (-10ns) and 1:1 cross relaxation times which cannot measured by usual magnetic resonance method were measured by optical techniques in benzil and tm^<2+>:SrF_2. Optical hole burning ,photon echoes ,optical fid and Raman heterodyne signals of NMR were observed for Pr^<3+>:LaF_3. Crystal twinning of LaF_3 was confirmed experimentally for the first time. Enhancement of NMR spin echo signals by optical irradiation and anomalous lengthening of the NMR transverse relaxation times were found.