Interaction of two laser fields with a three-level molecular system

Panock, R.; Temkin, R.J.

doi:10.1109/jqe.1977.1069354

Cited by 151 publications

(19 citation statements)

References 21 publications

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“…Finally, a cooler wall radius T00l 5 defined by a factor f00i referring it to the aperture radius Tcoo1 Icool • Tap (10) Both, Tap and . should be kept as small as possible, and a compromise has to be found.…”

Section: Design Of Standard Resonatorsmentioning

confidence: 99%

“…The whole procedure from (3) to (10) shows that the ring resonator geometry can be completely characterized by g-parameter and resonator perimeter L0. The configuration is referenced by a name like STD/61/2.0 where the 61 stands for the used g-parameter g = 0.61 (rounded to two digits) and 2.0 denotes the resonator perimeter L0 in m.46 If not otherwise indicated, all simulations to follow have been performed on a STD/61/2.0 resonator.…”

Section: Design Of Standard Resonatorsmentioning

confidence: 99%

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FIRL: simulations of methanol laser output power

Raum¹

1999

SPIE Proceedings

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In airborne heterodyne receivers for remote sensing of the OH radical in the stratosphere, optically pumped methanol gas lasers on the 2.523 THz line are used as local oscillators. In order to optimize their performance, a new simulation concept has been developed and is described here.A standard design procedure for SMMW ring lasers using a focussing mirror for optical pump beam guiding is scetched briefly. To make computations easier, the pump radiation distribution is averaged along the resonator. Using a quantum mechanical approach, a SMMW laser process model which takes into account the ac Stark effect the i\Iaxwell distribution and the Doppler effect can be derived. Transversal profiles of pump and SMMW intensity. absorption and gain coefficient, vibrational and physical temperature serve as a base for the determination of the SMMW laser output power. Based on this model. a computer program named FIRL has been developed. Computed results obtained with the program are presented and consequences for construction of SMMW lasers are discussed. Two laser prototypes have been built and demonstrate good agreement of simulated and measured results, indicating that the described program is a qualified CAD tool for methanol laser development.

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Section: Design Of Standard Resonatorsmentioning

confidence: 99%

Section: Design Of Standard Resonatorsmentioning

confidence: 99%

FIRL: simulations of methanol laser output power

Raum¹

1999

SPIE Proceedings

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“…After making the rotating wave approximation and writing Eq. (2) explicitly, we then write the optical Bloch equations for this system as follows 3 : …”

Section: Modelmentioning

confidence: 99%

Backpropagating neurons from bichromatic interaction with a three-level system

Kagan

Friedmann

1989

Appl. Opt.

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Optical implementation of a backpropagating neuron by means of a nonlinear Fabry-Perot etalon requires thresholding a forward signal beam while the transmittance of a backpropagating beam is multiplied by the differential of the forward signal. This is achievable by inputting a bichromatic field to a three-level system in an optical cavity. The response characteristics of this device have the added possibility of adaptability of the threshold by the backward probe input intensity.

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“…Therefore, the way to obtain Terahertz radiation is one of the foreland and emphasis in the Terahertz study area. Since 1970 [1][2][3][4] T.Y.Chang and Bridges [5][6][7][8] first used CO 2 laser pumping CH 3 F ,C 2 H 2 CL and CH 3 OH to obtain tens of far-infrared spectrums, the method of optically pumping has become an important and practical way to produce Terahertz laser.…”

Section: Introductionmentioning

confidence: 99%

Study of Optimal Cavity Parameter in Optically Pumped D2O Gas Terahertz Laser

Zhang

et al. 2010

J Infrared Milli Terahz Waves

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Heavy water gas (D 2 O gas) which owns special structure property, can generate terahertz radiation by optically pumping technology, and its 385 μm wavelength radiation can be widely used. In this research, on the base of semi-classical density matrix theory, we set up a three-level energy system as its theoretical model, a TEA-CO 2 laser 9R (22) output line (λ= 9.26 μm) acted as pumping source, D 2 O gas molecules were operating medium, the expressions of pumping absorption coefficient G p and Terahertz signal gain coefficient G s were deduced. It was shown that the gain of Terahertz signal was related with the energy-level parameters of operating molecules and some operating parameters of the Terahertz laser cavity, mainly including cavity length. By means of iteration method, the output power density of Terahertz pulse signal was calculated numerically. Changing the parameter of cavity length and keeping others steady, the relationship curve between the output power intensity (Is) of Terahertz pulse laser and the operating cavity length (L) was obtained. The curve showed that the power intensity (Is) increased with cavity length (L) in a certain range, but decreased when the length (L) exceeded some value because of the absorption effect, and there was an optimal cavity length for the highest output power. We used a grating tuned TEA-CO 2 laser as pumping power and a sample tube of variable length in 70-160 cm as terahertz laser operating cavity to experiment. The results of theoretical calculation and experiment matched with each other, and it is helpful for miniaturizing terahertz laser volume to make it practical.

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Interaction of two laser fields with a three-level molecular system

Cited by 151 publications

References 21 publications

FIRL: simulations of methanol laser output power

FIRL: simulations of methanol laser output power

Backpropagating neurons from bichromatic interaction with a three-level system

Study of Optimal Cavity Parameter in Optically Pumped D2O Gas Terahertz Laser

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