Journal ArticleDOI
Line shape theory for a Doppler‐broadened signal in presence of an infrared pump
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TLDR
In this article, a theory of line shape for a Doppler broadened probe in the presence of a strong infrared pump is presented; the T1, T2 relaxations are introduced phenomenologically in these equations.Abstract:
A theory of line shape for a Doppler broadened probe in the presence of a strong infrared pump is presented. The optical analog of Bloch equations has been developed; the T1, T2 relaxations are introduced phenomenologically in these equations. Doppler broadening of both the pump and signal transitions are taken into account to obtain the absorption coefficient for the signal. This leads to a Doppler broadened Gaussian function weighted by a pump induced Lorentzian function whose position and linewidth are controlled by the detuning and power respectively of the pump radiation. The absorption coefficient is further modulated by a Lorentzian function containing the fourth power of the radiation. The off‐resonance pumping leads to two symmetrically located ‘‘Lamb dips’’ or ‘‘peaks’’ around the Gaussian pedestal for co‐ and counter propagating laser radiations. A calculation of the line shape of the central sub‐Doppler feature for the on‐resonance pumping is in good agreement with the observed variation of li...read more
Citations
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Journal ArticleDOI
Lineshape theory of doppler-free coupled closely spaced transitions in the presence of a strong radiation field: The effect of non-resonant interactions
Pradip N. Ghosh,Swapan Mandal +1 more
TL;DR: In this paper, the lineshape of a pair of Doppler-free closely spaced transitions sharing a common level in the presence of a uniform radiation field is studied numerically.
Journal ArticleDOI
Infrared double-resonance lineshapes in strongly pumped spherical-top molecules
TL;DR: In this paper, strong double-resonance signals are observed in silane pumped with a TEA-CO 2 laser and probed with a tunable diode laser, and the lineshapes of these signals have been modeled with an extension of three level density matrix theory to the case of a large bandwidth pump laser.
Journal ArticleDOI
Signal line shapes in four-level double resonance spectroscopy with closely spaced levels
Swapan Mandal,Pradip N. Ghosh +1 more
TL;DR: In this article, the interaction of two electromagnetic radiations with a four-level atom with two closely spaced common levels is studied for the cascade system, where the spacing between the close levels is assumed to be small so that the radiation frequency can act simultaneously on the two closely-spaced resonances.
Journal ArticleDOI
Temperature-dependent fermi resonance studies and lineshape simulation by random perturbation model
TL;DR: The lineshapes of Fermi diads of thioacetamide and methyl thiourea have been measured at different temperatures in the 120-300 K range as mentioned in this paper.
Journal ArticleDOI
Lineshape theory for three-level double resonance in the presence of infrared laser radiation
TL;DR: In this paper, a set of coupled optical Bloch equations has been solved to obtain the absorption lineshape for both copropagating and counter-propagating three-level double resonances in the presence of a strong infrared laser source.
References
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Book
Nonlinear Laser Spectroscopy
TL;DR: In this paper, the theory of Resonant Interaction of a Laser Field and Gas was introduced and Narrow Saturation Resonances on Doppler-Broadened Transition was discussed.
Journal ArticleDOI
Theory of a three-level gas laser amplifier
T. Hansch,Peter E. Toschek +1 more
TL;DR: In this paper, a laser amplifier consisting of an ensemble of atoms, three energy levels of which form two coupled transitions of arbitrary frequencies, is treated, and the gain profile (or spontaneous emission) on the transition corresponding to the weak probe wave, modified by the perturbing field on the other transition, is calculated via a susceptibility.
Journal ArticleDOI
Laser-Induced Line-Narrowing Effects in Coupled Doppler-Broadened Transitions
Michael S. Feld,Ali Javan +1 more
TL;DR: Laser induced line narrowing in coupled Doppler broadened transitions, noting mode crossing and spontaneous emission as mentioned in this paper, was shown to be useful in the detection of spontaneous emission in the presence of laser.
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