Dual frequency emission in a compact semiconductor laser for coherent population trapping cesium atomic clocks

We present the dual-frequency emission of a diode-pumped vertical external-cavity semiconductor laser at 852 nm dedicated to coherent population trapping experiments. With a compact cavity more than 10mW is demonstrated in each polarization, with a frequency difference in the GHz range. One polarization has been stabilized on an atomic transitio

Coherent dual-frequency emission of a vertical external-cavity semiconductor laser at the cesium D2 line

International audienceWe describe the dual-frequency and dual-polarization emission of a diode-pumped vertical external-cavity semiconductor laser at 852 nm dedicated to the coherent population trapping of cesium atoms. The output power reaches ∼20 mW on each frequency, with a frequency difference in the GHz range

Tunable high-purity microwave signal generation from a dual-frequency VECSEL at 852 nm (orale)

International audienceWe demonstrate the dual-frequency emission of a diode-pumped vertical external-cavity semiconductor laser operating at 852 nm, dedicated to the coherent population trapping of cesium atoms for compact atomic frequency references. It is based on a single laser cavity sustaining the oscillation of two adjacent, cross-polarized, modes. The output power reaches 10 mW on each frequency. The frequency difference and the absolute laser frequencies are simultaneously precisely tuned and stabilized on external references, resulting in the generation of a high-purity optically-carried microwave signal. The laser design has focused on stability and compactness

Emission bifréquence d'un laser à semiconducteur en cavité externe à 852 nm pour les horloges atomiques a césium (orale)

National audienceNous décrivons l'émission simultanée en phase, sur deux fréquences optiques polarisées perpendiculairement, d'un laser à semiconducteur en cavité externe pompé optiquement. L'émission est accordable autour de la raie D2 du césium à 852,14 nm avec une puissance optique d'environ 13 mW sur chaque polarisation. La différence de fréquence est ajustée grâce à un modulateur électro-optique autour de 9,2 GHz. Nous évaluons la source réalisée en vue de son application au piégeage cohérent de population d'atomes de césium dans une horloge atomique

Western men and Eastern arts: The significance of Eastern martial arts disciplines in British men's narratives of masculinity

Previous Western sociological research on Eastern martial arts has identified a tension between ‘traditional’ Eastern forms of practice and ‘modernized’ Western methods of training and competition. In particular, the ‘sportization’ of Eastern styles, where combat-centred arts based upon moral philosophies have transformed more or less into competitive activities following Western models of rationalized sport, has been an important theme. However, it is also suggested that Eastern martial arts hold special significance in the West for their seemingly esoteric nature. In this regard, such martial arts are considered significant because they are not ‘sports’, but rather disciplines, with fairly different connotations for practitioners. Drawing on interview data, this paper explores how Western practitioners of Eastern martial arts articulate this difference, principally by examining the place of martial artistry in British men's narratives of masculinity. Comparing themselves favourably to assumed, typical visions of Western sporting masculinity, such men draw upon the imagined uniqueness of their martial arts to construct a sense of moral superiority over other men. In so doing, they contribute to a rejection of what they believe to be ‘mainstream’ sporting Western masculinity, thus indicating the role that ‘alternative’ visions of physical culture can play in men's active constructions of gender

Simple-Design Low-Noise NLTL-Based Frequency Synthesizers for a CPT Cs Clock

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Measurements of Cs-buffer gas collisional frequency shift using CPT interrogation

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Cs buffer gas collisional frequency shift: method and preliminary measurements

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Measurements of Cs-buffer gas collisional frequency shift using CPT interrogation

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Frequency measurement, isotope shift and hyperfine structure of the 4d

The frequency of the centroid of the transition $4d^{9}5s^{2}\ ^{2}{\rm D}_{5/2} \rightarrow 4d^{10}6p ^{2}{\rm P}_{3/2}$in Ag I has been determined by laser spectroscopy of a collimated metastable thermal atomic beam. We find$\nu=547 376 388(60)$MHz. The isotope shift$\nu(^{109}{\rm Ag})- \nu(^{107}{\rm Ag})=-982.6(5.4)$MHz. For the magnetic hyperfine structure constant of the$4d^{10}6p\ ^{2}{\rm P}_{3/2}$state, assuming IJ coupling, we find,$A(^{107}{\rm Ag})=-8.4(6)$MHz and$A(^{109}{\rm Ag})=-10.2(6)$ MHz