P Cordiale et al 2000 Metrologia 37 177 doi:10.1088/0026-1394/37/2/11
P Cordiale, G Galzerano and H Schnatz
Show affiliationsAn international comparison of two I2-stabilized frequency-doubled Nd:YAG lasers at λ = 532 nm has been performed between the Istituto di Metrologia "G. Colonnetti" (IMGC)/Politecnico di Milano (PoliMI) and the Physikalisch-Technische Bundesanstalt (PTB). Both lasers used saturated absorption of the P(54) 32-0 iodine transition as a frequency reference. The signals for stabilizing the lasers were obtained using the frequency modulation spectroscopy technique with an external iodine cell. A minimum value for the relative Allan standard deviation of 7 × 10-14 was reached after an integration time of 40 s. The hyperfine line separations were measured by the beat-frequency method and compared with the frequency values recently reported by Ye and co-workers. Three different iodine cells were investigated. The range of frequency differences for the iodine cells IMGCQU and PTB1/98 between the two lasers was from -9 kHz to 7.3 kHz with a mean of 1.2 kHz and a standard deviation of 3.5 kHz. Taking into account the measured frequency offsets of the different iodine cells, the evaluated frequency repeatability of the optical standards was within 2.5 kHz.
42.55.Rz Doped-insulator lasers and other solid state lasers
42.60.Lh Efficiency, stability, gain, and other operational parameters
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
Issue 2 (April 2000)
P Cordiale et al 2000 Metrologia 37 177
R Thalmann 1996 Metrologia 33 187
H Darnedde and J Helmcke 1996 Metrologia 33 485
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