In this work, we have applied polarization spectroscopy to study electromagnetically induced transparency involving hot Rb85 Rydberg state in a vapor cell using a Laguerre–Gaussian mode beam. Such spectroscopy technique generates a dispersive signal, which allows a direct measurement of the transition linewidth. Our results show that the measured transition linewidth for a Laguerre–Gaussian mode control beam is narrower than for a Gaussian mode. Besides, it can be well reproduced by a simplified Lindblad master equation model.
The technique of laser cooling, whose basic idea was proposed in 1975 [1], provided the development of many important areas like high-resolution spectroscopy [2], atomic clocks [3] and quantum gases confined in magnetic or optical traps [4,5]. Among the techniques applied to cooling neutral atoms is the optical molasses [6] that will be explored in this work. Here we study the standard molasses and a new alternated molasses configuration, which consists of turning on just one pair of counter-propagating laser beams per cycle, and alternating this pair between the three spatial directions. We analyse the two techniques under the lens of the radiation force, by exploring a semiclassical treatment, in order to obtain the minimum energy attained by each of them at the end of the cooling process. We compare, then, these two cooling techniques, pointing out their advantages.
Resumo Armadilhas ópticas de dipolo surgiram a partir do que hoje conhecemos por pinças ópticas. Elas foram inicialmente desenvolvidas para o aprisionamento de átomos neutros, cujo diâmetro é muito menor do que o comprimento de onda da luz utilizada para aprisionar. Devido à sua significância e grande utilização nos experimentos de átomos e moléculas frias, sua compreensão torna-se importante. Portanto, neste trabalho, fazemos, passo-a-passo e didaticamente, a construção teórica da armadilha de dipolo e de um de seus dois possíveis regimes, o regime quase-eletrostático (QUEST). Apresentamos uma possibilidade de montagem experimental, enfatizando as vantagens da armadilha óptica de dipolo no regime QUEST.
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