Frequency reproducibility of an iodine-stabilized Nd:YAG laser at 532 nm

Abstract We have established an ensemble of iodine-stabilized Nd:YAG lasers to verify the frequency reproducibility of the laser. The stability, repeatability and several systematic shifts of the laser frequency are investigated by heterodyne beating of the lasers. The frequency dispersion of the ensemble of lasers is evaluated to be 0.5 kHz (corresponding to a relative frequency uncertainty of 8 × 10−13). The absolute frequency of one of the lasers (named as Y3) is measured to be 563 260 223 507 897(58) Hz using a femtosecond optical comb, when the laser was stabilized on the a10 component of the R(56)32-0 transition of 127I2 for a cold-finger temperature of −10 °C. This group of lasers, including one transportable laser, forms an ensemble of optical frequency standards, which serves for many applications such as international comparisons, optical frequency measurements, frequency calibration services and high-resolution spectroscopy.

[1]  Jing Zhang,et al.  Portable I2-stabilized Nd: YAG laser for international comparisons , 2001, IEEE Trans. Instrum. Meas..

[2]  J Reichert,et al.  Accurate measurement of large optical frequency differences with a mode-locked laser. , 1999, Optics letters.

[3]  Hall,et al.  Direct link between microwave and optical frequencies with a 300 THz femtosecond laser comb , 2000, Physical review letters.

[4]  Jun Ye,et al.  Rotation dependence of electric quadrupole hyperfine interaction in the ground state of molecular iodine by high-resolution laser spectroscopy , 2001 .

[5]  Jun Ye,et al.  Absolute frequency of the molecular iodine transition R(56)32-0 near 532 nm , 1995 .

[6]  Gary C. Bjorklund,et al.  Residual amplitude modulation in laser electro-optic phase modulation , 1985 .

[7]  Jun Ishikawa,et al.  Frequency comparison of 127I2-stabilized Nd: YAG lasers , 1998, IEEE Trans. Instrum. Meas..

[8]  Theodor W. Hänsch,et al.  Absolute Optical Frequency Measurement of the Cesium D 1 Line with a Mode-Locked Laser , 1999 .

[9]  Martial Ducloy,et al.  HETERODYNE SATURATION SPECTROSCOPY THROUGH FREQUENCY MODULATION OF THE SATURATING BEAM , 1982 .

[10]  Mikko Merimaa,et al.  Comparison of 127I2-stabilized frequency-doubled Nd:YAG lasers at the Bureau International des Poids et Mesures. , 2003, Applied optics.

[11]  F. Hong,et al.  Hyperfine structures of the R(122)35-0 and P(84)33-0 transitions of near 532 nm , 2000 .

[12]  C W Oates,et al.  Absolute frequency measurements of the Hg+ and Ca optical clock transitions with a femtosecond laser. , 2001, Physical review letters.

[13]  T J Quinn,et al.  Practical realization of the definition of the metre, including recommended radiations of other optical frequency standards (2001) , 2003 .

[14]  R L Byer,et al.  Absolute frequency stabilization of diode-laser-pumped Nd:YAG lasers to hyperfine transitions in molecular iodine. , 1992, Optics letters.

[15]  New Jersey,et al.  Phase-coherent frequency measurement of the Ca intercombination line at 657 nm with a Kerr-lens mode-locked femtosecond laser , 2000, physics/0010016.

[16]  Hall,et al.  Carrier-envelope phase control of femtosecond mode-locked lasers and direct optical frequency synthesis , 2000, Science.

[17]  John L. Hall,et al.  Optical frequency standard at 532 nm , 1995 .

[18]  S. Iwasaki,et al.  Compact I2-Stabilized Frequency-Doubled Nd:YAG Laser for Long Gauge Block Interferometer , 2003 .

[19]  H. Matsumoto,et al.  Vibration dependence of the tensor spin–spin and scalar spin–spin hyperfine interactions by precision measurement of hyperfine structures of 127 I 2 near 532 nm , 2002 .

[20]  F. Hong,et al.  Accurate frequency atlas of molecular iodine near 532 nm measured by an optical frequency comb generator , 2001 .

[21]  Theodor W. Hänsch,et al.  Frequency Comparison and Absolute Frequency Measurement of I2-stabilized Lasers at 532 nm , 2001 .

[22]  J. Shirley,et al.  Modulation transfer processes in optical heterodyne saturation spectroscopy. , 1982, Optics letters.

[23]  Jun Ye,et al.  Absolute frequency atlas of molecular I2 lines at 532 nm , 1999, IEEE Trans. Instrum. Meas..

[24]  Jun Ishikawa,et al.  Comparison of independent optical frequency measurements using a portable I/sub 2/-stabilized Nd:YAG laser , 2002, Conference Digest Conference on Precision Electromagnetic Measurements.

[25]  H. Matsumoto,et al.  Hyperfine structure and absolute frequency determination of the R(121)35-0 and P(142)37-0 transitions of near 532 nm , 2002 .

[26]  John L. Hall,et al.  Optical heterodyne spectroscopy enhanced by an external optical cavity: toward improved working standards , 1990 .

[27]  H. Matsumoto,et al.  Rotation dependence of the excited-state electric quadrupole hyperfine interaction by high-resolution laser spectroscopy of 127 I 2 , 2001 .

[28]  J. L. Hall,et al.  Molecular iodine clock. , 2001, Physical review letters.

[29]  Robert L. Byer,et al.  Laser heterodyne spectroscopy of 127 I 2 hyperfine structure near 532 nm , 1993 .

[30]  Feng-Lei Hong,et al.  Stabilization and frequency measurement of the I2-stabilized Nd: YAG laser , 1998, IEEE Trans. Instrum. Meas..

[31]  Y. Millerioux,et al.  International comparison of 127I2-stabilized frequency-doubled Nd:YAG lasers between the BIPM, the NRLM and the BNM-INM, October 2000 , 2001 .

[32]  Hirokazu Matsumoto,et al.  Frequency measurements and hyperfine structure of the R(85)33–0 transition of molecular iodine with a femtosecond optical comb , 2004 .

[33]  Mikko Merimaa,et al.  Results from international comparisons at the BIPM providing a world-wide reference network of 127I2 stabilized frequency-doubled Nd: YAG lasers , 2003, IEEE Trans. Instrum. Meas..