[2] Edwards C S, Rowley W R C. A 633 nm iodine-stabilized diode-laser frequency standard. Metrologia, 1999, 36: 51~45
[3] Simonsen H R, Zarka A. Iodine-stabilized extended-cavity diode laser at 633 nm: result of international comparison. Metrologia, 1998, 35: 197~202
[4] Eickhoff M L, Hall J L. Optical frequency standard at 532 nm. IEEE Transactions on Instrumentation and Measurement, 1995, 44(2): 155~158
[5] Edwards C S, Rowley W R C. Absolute frequency stabilization o f a 637 nm laser diode using Doppler-free I2 spectra. Electron. Lett., 1995, 31(10): 796~797
[6] Wallard A J. Frequency stabilization of the helium-neon laser by saturated absorption in iodine vapour. J. Phys. E: Sci. Instrum., 1972, 5(9): 926~930
[7] Lassila A, Chartier J M. International comparison of He-Ne laser stabilized with at 633 nm (Comparison of the fifth-and-third-harmonic locking techniques). Metrologia, 2000, 37: 701~707
[8] Steck D A. Rubidium 87 D Line Data. http:∥steck.us/alkalidata, 2001, 1~29