ORCID Profile
0000-0002-4415-0655
Current Organisation
UNIVERSIDAD AUTONOMA DE SINALOA
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Publisher: American Physical Society (APS)
Date: 03-04-2020
Publisher: Optica Publishing Group
Date: 17-01-2023
DOI: 10.1364/OE.477648
Abstract: Nowadays, atom-based quantum sensors are leaving the laboratory towards field applications requiring compact and robust laser systems. Here we describe the realization of a compact laser system for atomic gravimetry. Starting with a single diode laser operating at 780 nm and adding only one fiber electro-optical modulator, one acousto-optical modulator and one laser lifier we produce laser beams at all the frequencies required for a Rb-87 atomic gravimeter. Furthermore, we demonstrate that an atomic fountain configuration can also be implemented with our laser system. The modulated system reported here represents a substantial advance in the simplification of the laser source for transportable atom-based quantum sensors that can be adapted to other sensors such as atomic clocks, accelerometers, gyroscopes or magnetometers with minor modifications.
Publisher: Hindawi Limited
Date: 05-05-2020
DOI: 10.1155/2020/6147378
Abstract: Data stream classification becomes a promising prediction work with relevance to many practical environments. However, under the environment of concept drift and noise, the research of data stream classification faces lots of challenges. Hence, a new incremental ensemble model is presented for classifying nonstationary data streams with noise. Our approach integrates three strategies: incremental learning to monitor and adapt to concept drift ensemble learning to improve model stability and a microclustering procedure that distinguishes drift from noise and predicts the labels of incoming instances via majority vote. Experiments with two synthetic datasets designed to test for both gradual and abrupt drift show that our method provides more accurate classification in nonstationary data streams with noise than the two popular baselines.
Publisher: Wiley
Date: 09-2017
Publisher: AIP Publishing
Date: 15-06-2023
DOI: 10.1063/5.0151432
Abstract: Gravimeters fabricated with MEMS suffer from temperature-dependent drifts in their long-term stability. We analyze the thermal contributions to the signal, and we propose three mechanisms to mitigate their effects. The first one uses materials that fulfill the condition αE=−2α, where thermal expansion is canceled by the temperature variation of Young’s modulus. The second one uses the thermal expansion to introduce a compression that compensates variation in the force of the spring. In the third one, expansion compensates the displacement of the proof mass in the sensor, rather than the force. The three mechanisms are robust since they only depend on the temperature of the sensor itself.
Publisher: Optica Publishing Group
Date: 29-06-2021
DOI: 10.1364/OSAC.414110
Abstract: The laser beam waist has an impact both in the sensitivity and systematic effects present in gravimetry and atom interferometry in general. In this paper we consider how different effects contribute to both aspects in order to make a better selection of the radius of the Raman beam given a particular laser power available. A large beam waist reduces systematic effects coming from wavefront curvature and Gouy phase contributions and improves the fringe contrast due to reduced intensity gradients. On the other hand, a large waist gives a smaller Rabi frequency, which lowers the sensitivity by reducing the fraction of atoms in the selected velocity range. Considering all contributions, we find that systematic effects usually have a dominant role in selecting a beam waist.
Publisher: The Optical Society
Date: 15-04-2013
Publisher: AIP Publishing
Date: 2012
DOI: 10.1063/1.3680612
Abstract: We present a laser configuration capable of fast frequency changes with a high power output and a large tuning range. The system integrates frequency tuning with an acousto-optic modulator with a double pass tapered lifier. A compensation circuit keeps the seed power constant and prevents damage to the lifier. A single mode fiber decouples the modulation and lification sections and keeps the alignment fixed. The small power required to saturate the lifier makes the system very reliable. We use the system to obtain a dipole trap that we image using a beam derived from the same configuration.
Publisher: Sociedad Mexicana de Fisica A C
Date: 05-2023
DOI: 10.31349/REVMEXFIS.69.031302
Abstract: An optical interferometer has a high sensitivity to displacements of the mirrors and other optical elements, something that becomes a source of fluctuations in situations where one is only interested in the phase change due to a s le inserted in one of the paths. A Sagnac interferometer minimizes this sensitivity by having the two beams follow opposite trajectories, so that a mirror displacement gives a similar phase change for both paths, but makes it impossible to insert an element that affects only one path. We present a new kind of interferometer, the Star interferometer, where the two beams still interact with all the optical elements while having different trajectories. We obtain a common phase change in both trajectories by having a different number of turns for each path. Having independent access to both trajectories makes it possible to determine the phase change due to a s le inserted in one of the paths, opening new possibilities for interferometric configurations that maintain a reduced sensitivity to displacements of the optical elements.
Publisher: IOP Publishing
Date: 03-2016
Publisher: American Physical Society (APS)
Date: 29-09-2016
Location: Australia
Location: Mexico
No related grants have been discovered for Victor M Valenzuela.