1,721,065 research outputs found
g(J) Factor of neutral calcium P-3 metastable levels
No full textThe frequencies of the different Zeeman components of the neutral calcium metastable (4s, 4p) P-3(1) and P-3(2) levels were measured in a highly homogeneous magnetic field of the order of 0.4 T by a double-resonance technique in an atomic metastable beam. The Lande factor of the two levels was determined as g(J)(3P1) = 1.5010829(28) and g(J)(P-3(2)) = 1.5011308(75). (C) 1998 Optical Society of America [S0740-3224(98)00208-2] OCIS codes: 020.0020, 020.7490, 300.6320
NEAR-UV SUB-DOPPLER SPECTROSCOPY ON A METASTABLE MG BEAM BY A FREQUENCY-DOUBLED DIODE-LASER
No full textNear-UV radiation is generated by doubling the frequency of a semiconductor laser in a nonlinear crystal. The crystal is contained in a resonant cavity in order to improve the conversion efficiency. The cavity increases the efficiency by about three orders of magnitude. This radiation has been used to perform spectroscopy of metastable magnesium in an atomic beam. We observed the (3s3p)3P-(3s3d)3D transition multiplet, which is of interest for metrological applications. The isotopic shift between Mg-24 and Mg-26 was measured and new information on the hyperfine structure of Mg-25 was obtained. This radiation source is promising also in order to improve the Mg frequency standard
Measurementof the 4s(2) 1S0 -> 4s3d 1D2 transition probability in calcium
No full textWe have measured the ratio between the transition probabilities of two forbidden lines in Ca: the intercombination line at 657.3 nm and the E2 line at 457.5 nm. The value we obtained for this ratio is (54.1 +/- 2.4). Combined with the most accurate value available in literature for the lifetime of the P-3(1) level, our measurement gives a value of (54.4 +/- 4.0) s(-1) for the S-1(0) --> D-1(2) transition probability, significantly more accurate than the previous determinations
Light-induced ejection of alkali-earth atoms from polimer surfaces: preliminary results in calcium
No full text
Frequency stabilization of a diode laser on the Cs D-2 resonance line by the Zeeman effect in a vapor cell
No full textHyperfine optical pumping of a Cs-vapor cell through a diode laser in frequency standards requires a high purity of the laser emission spectrum, and a high stability of the emission frequency. We present here a frequency-locking scheme that is able to produce a discrimination signal without any modulation, by using the dichroism induced by a magnetic field on the atomic vapor. The larger line-width of the reference signal (Doppler-broadened) is compensated by its larger amplitude, when compared with the saturated absorption signal. As a final result, the slope is similar, and the large line-width warrants a large locking range, making robust the lock against external perturbations. This error signal is used to lock the frequency of an external cavity diode laser, with a grating reflector in Littman configuration. A fast correction band is obtained by changing the cavity length through an intra-cavity electro-optic modulator. The possible sources of instabilities of the locking point are discussed and estimated through a simulation computer program
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