Designing of transparency windows by quantum interference of wave packets

Journal Article · Thu Jul 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.013404· OSTI ID:21442930

Dastidar, Krishna Rai ^[1]; Bhattacharjee, Anindita ^[2]

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1. Department of Spectroscopy, Indian Association for the Cultivation of Science, Kolkata 700032 (India)
2. 1035 Aster Ave., Apt. 2131, Sunnyvale, California 94086 (United States)

It has been shown that control over the design of single- or multimode-transparency windows can be achieved by control-probe quantum interferometry using two delayed phase-locked ultrashort pulses. We have investigated how single- or multimode-transparency windows can be designed by eliminating the absorption to a set of odd or even vibrational levels of a molecule covered by the spectral bandwidth of the pulses. Suppression of absorption can be achieved by controlling the quantum interference of two vibrational wave packets excited by these two pulses, leading to destructive interference of transition amplitudes for one set of vibrational levels even or odd. Simuntaneously the interference becomes constructive for the other set of odd or even vibrational levels, leading to absorption to these levels. Thus, a set of transparency windows is designed in between two absorption peaks at two consecutive odd (even) vibrational levels by eliminating absorption at even (odd) vibrational levels between two absorption peaks. If the spectral bandwidth of the pulse [full width at half maximum (FWHM)] is less than the energy difference between two consecutive absorption peaks, the pulse will be transmitted without absorption through the transparency window. However, for pulses with a larger spectral bandwidth (FWHM), a set of broad transparency windows will be generated and different bands of pulse frequencies will be transmitted through these windows. We have shown that coherent control of the design of transparency windows can be achieved by controlling pulse duration, carrier frequency, delay, and the phase difference of two ultrashort pulses.

• OSTI ID: 21442930
• Journal Information: Physical Review. A, Vol. 82, Issue 1; Other Information: DOI: 10.1103/PhysRevA.82.013404; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
CONTROL
INTERFERENCE
INTERFEROMETRY
MOLECULES
OPACITY
PHOTON-MOLECULE COLLISIONS
PULSES
TRANSITION AMPLITUDES
VIBRATIONAL STATES
WAVE PACKETS
AMPLITUDES
COLLISIONS
ENERGY LEVELS
EXCITED STATES
MOLECULE COLLISIONS
OPTICAL PROPERTIES
PHOTON COLLISIONS
PHYSICAL PROPERTIES
SORPTION