Title :
Frequency comparison of 127I2-stabilized Nd:YAG lasers
Author :
Hong, Feng-Lei ; Ishikawa, Jun ; Yoda, Jun ; Ye, Jun ; Ma, Long-Sheng ; Hall, John L.
Author_Institution :
Nat. Res. Lab. of Metrol., Ibaraki, Japan
fDate :
4/1/1999 12:00:00 AM
Abstract :
A first international comparison of I2-stabilized Nd:YAG lasers has been made between the National Research Laboratory of Metrology (NRLM), Tsukuba, Japan, the Joint Institute for Laboratory Astrophysics JILA (formerly the Joint Institute for Laboratory Astrophysics), Boulder, CO, the National Institute of Standards and Technology (NIST), Boulder, and the University of Colorado, Boulder. The results of the comparison show that the square root Allan variance of the portable NRLM laser has reached 2×10-14 when the integration time is larger than 300 s. Matrix measurements were made for five hyperfine components from a6 to a10 of the R(56)32-0 line. The averaged frequency difference between the NRLM and JILA lasers for four measurements made on three separate days was -4996 Hz (NRLM-JILA, at 532 nm) with a standard deviation of 88 Hz
Keywords :
frequency standards; iodine; laser frequency stability; neodymium; solid lasers; 127I2-stabilized Nd:YAG laser; Allan variance; I2; YAG:Nd; YAl5O12:Nd; hyperfine component; international comparison; optical frequency standard; Astrophysics; Extraterrestrial measurements; Frequency measurement; Laser stability; Laser transitions; Measurement standards; Metrology; NIST; Neodymium; Ultrafast optics;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
