We report a precise frequency locking technique using electromagnetically induced transparency in an atomic vapour cell for a semiconductor diode laser. The sub natural line-width of EIT (Electromagnetically induced transparency) allows improvement in the stability of the laser diode under the locked condition. D2 transition of 85Rb atom is used for this experiment. Frequency stability of the laser under the locked condition is of the order of 426 kHz which provides nearly 80 times better stability than the Doppler locked condition. © 2010 IACS.

BISWAJIT RAY

Physics

S MITRA

M M HOSSAIN

P N GHOSH

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Indian Journal of Physics

We present a strategy for enhancing the dissociation probability of a diatomic molecule, namely LiH, by designing optimal laser pulse. Dissociation dynamics is followed by solving time-dependent Schrödinger equation using time-dependent Fourier Grid Hamiltonian technique with optimal laser pulse function, generated by using the stochastic optimization technique of simulated annealing. We show that as we increase number of variable parameters while designing the optimal time dependent perturbation, higher dissociation is obtained. The step-wise increase in dissociation probability with the increase in complexity of designed pulse is clearly shown. © 2013 Indian Association for the Cultivation of Science.

Optimal designing of polychromatic field for maximum dissociation of LiH molecule

Applied Physics Letters

Laser frequency offset locking using electromagnetically induced transparency

Physical Review Letters

Observation of Light Dragging in a Rubidium Vapor Cell

Miniature vapor-cell atomic-frequency references

Nature

Long-distance quantum communication with atomic ensembles and linear optics

Absolute Optical Frequency Measurement of the CesiumD1Line with a Mode-Locked Laser

EIT locking of a semiconductor diode laser: Significant improvement over Doppler locking

Journal	Indian Journal of Physics
Publisher	INDIAN ASSOC CULTIVATION SCIENCE
ISSN	0973-1458