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Quantum Electronics and Laser Science Conference

Tunable, up converted stimulated ultraviolet Mellow triplet via four-wave mixing

Leo Moorman, Ioan M. Pop

Published Jun 7, 1996• 0 citations
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Abstract

Summary form only given. Two new types of upward-converted, tunable, stimulated ultraviolet emissions and one fixed frequency type are generated via two-photon near-resonant 3S/sub 1/2/-5S/sub 1/2/ pumping of a Na vapor. All observed tunable components near 330 nm are associated with the J=3/2 multiplet and none with the J=1/2 multiplets of the 4P state.

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Tunable UV coherent radiation and infrared stimulated radiation generated by hybrid pumping in the Na2-Na system

Zugeng Wang, Xiaoling Tang, Kai-Chang Zhang +2 more

For the first time by means of two-photon hybrid excitation in the Na2-Na system, which is distinguished from the usual two-photon excitation in atomic vapor, tunable UV coherent radiation (between 337.6 and 339.1 nm and between 358.0 and 359.6 nm) and tunable infrared stimulated radiation (3.38-3.46 µm) were generated. By optically pumping with a pulsed dye laser scanning from 614.5 to 617.4 nm for sodium vapor in a heat-pipe oven, Na2 was excited by the first photon absorption from the X ′ Σ g + to the A ′ Σ u + state. The energy was transferred to Na by Na2*-Na collision to populate the levels 3p1/2,3/2 in Na, which was followed by another photon excitation from the same beam up to near the 5S level, resulting in SERS (3P1/2-4P and 3P3/2-4P) and OPSE(5S → 4P and 4P → 4S) radiation. Assuming the detunings of pumping frequency ω1, from ω(5S,3P3/2) and ω(5s,3p1/2) to be Δ1 and Δ2, respectively, the three UV coherent radiation components were supposed to be generated by the following mixing processes: ωUV = 2ω1 − ω(5S − 4P); ω U V ′ = 2 ω 1 − [ ω ( 5 S → 4 P ) + Δ 1 ] ; ω U V ′ ′ = 2 ω 1 − [ ω ( 5 S → 4 P ) + Δ 2 ] , and also ω U V ′ ′ ′ = 2 ω 1 − ω ( 4 P → 4 S ) . The SERS and the UV signals were tuned as the pumping wavelength was tuned. The measured wavelengths agreed well with the calculated values.

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Infrared up-conversion with resonantly two-photon pumped metal vapors

D. M. Bloom, James T. Yardley, J. F. Young +1 more

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Observation of four-wave mixing involving two quadrupole transitions in Na vapor

R. L. Panock, Richard R. Freeman, John E. Bjorkholm

We have observed a four-wave mixing process in sodium vapor in which two of the four waves are resonantly enhanced by electric quadrupole transitions. The atom is pumped via a quadrupole transition from the 3s to the 4d state with a single photon at 2894 Å. Intense coherent emission at 3427 Å corresponding to the 3d-3s transition can be observed exiting the Na cell only in the direction parallel to the input beam. Also observed coming from the cell is intense coherent light at 2.34 µm corresponding to the 4d-4s transition in Na.

Conference on Lasers and Electro-Optics•Jan 1, 1981•0 citations

Observation of new tunable ultraviolet emissions by four-wave mixing in sodium vapor

Chang Wu, J. K. Chen, D. L. Judge +1 more

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STIMULATED EMISSION BASED ON TWO-STEP HYBRID RESONANCE $A^{1}\Sigma_{u}^{+}$ OR $B^{1}\Pi_{u}$ STATE OF $Na.^{*}$

L. J. Qin, Z. G. Wang, K. C. Zhang +1 more

The first step of the hybrid excitation in the experiment was achieved by using a pulse broadband ($\\sim$200 {\\AA}) dye laser beam through a heat pipe oven. But the total covered pumping wavelength region from 4600 {\\AA} to 6800 {\\AA} the populated upper electronic state in $Na_{2}$ should be either $A^{\\prime}\\Sigma_{u}$ or $B^{\\prime}\\Pi_{u}$ state. The excited sodium dimers $Na_{2}^{\\ast}$ transfered their energy to sodium atoms Na by near resonace collisions and the Na then would populate up the 3P level from ground state 3s. The Na were consequentely pumped up to 4D, 5D, 5S or 6S level from 3P by using a narrowband dye laser pumped by the same $N_{2}$ laser. The infrared stimulated radiation corresponding to the transitions of 4D-4P(2.34 $\\mu$m). 5D-4P(5.02$\\mu$m), 5S-4P(3.42 $\\mu$m) and 6S-5P(7.52 $\\mu$m) with cascade stimulated emission from 4P to 4S (2.20 $\\mu$m) and from 5P to 5S (5.43 $\\mu$m) were then obtained, Furthermore the dependence of the output energy on the pumping wavelengthes was measured and discussed.

•Jan 1, 1985•0 citations

Ultraviolet and blue stimulated emission from Cs alkali vapor pumped using two-photon absorption and four-wave mixing

Ricardo C. Davila, Christopher A. Rice, Nathan B. Terry +1 more

Stimulated emission on the ultraviolet and blue transitions in Cs has been achieved by pumping via two-photon absorption and four-wave mixing for the pump transition 62S12→82D32,52. The emission performance of the optically pumped cesium vapor laser operating in ultraviolet and blue has been extended to 650 nJ/pulse for 387 nm, 1 to 3 μJ/pulse for 388 nm, 200 nJ/pulse for 455 nm, and 500 nJ/pulse for 459 nm. Emission performance improves dramatically as the cesium vapor density is increased, and no scaling limitations associated with energy pooling or ionization kinetics have been observed.

Optical Engineering•Dec 9, 2024•0 citations
Summary form only given. Two new types of upward-converted, tunable, stimulated ultraviolet emissions and one fixed frequency type are generated via two-photon near-resonant 3S/sub 1/2/-5S/sub 1/2/ pumping of a Na vapor. All observed tunable components near 330 nm are associated with the J=3/2 multiplet and none with the J=1/2 multiplets of the 4P state.
For the first time by means of two-photon hybrid excitation in the Na2-Na system, which is distinguished from the usual two-photon excitation in atomic vapor, tunable UV coherent radiation (between 337.6 and 339.1 nm and between 358.0 and 359.6 nm) and tunable infrared stimulated radiation (3.38-3.46 µm) were generated. By optically pumping with a pulsed dye laser scanning from 614.5 to 617.4 nm for sodium vapor in a heat-pipe oven, Na2 was excited by the first photon absorption from the X ′ Σ g + to the A ′ Σ u + state. The energy was transferred to Na by Na2*-Na collision to populate the levels 3p1/2,3/2 in Na, which was followed by another photon excitation from the same beam up to near the 5S level, resulting in SERS (3P1/2-4P and 3P3/2-4P) and OPSE(5S → 4P and 4P → 4S) radiation. Assuming the detunings of pumping frequency ω1, from ω(5S,3P3/2) and ω(5s,3p1/2) to be Δ1 and Δ2, respectively, the three UV coherent radiation components were supposed to be generated by the following mixing processes: ωUV = 2ω1 − ω(5S − 4P); ω U V ′ = 2 ω 1 − [ ω ( 5 S → 4 P ) + Δ 1 ] ; ω U V ′ ′ = 2 ω 1 − [ ω ( 5 S → 4 P ) + Δ 2 ] , and also ω U V ′ ′ ′ = 2 ω 1 − ω ( 4 P → 4 S ) . The SERS and the UV signals were tuned as the pumping wavelength was tuned. The measured wavelengths agreed well with the calculated values.
We have observed a four-wave mixing process in sodium vapor in which two of the four waves are resonantly enhanced by electric quadrupole transitions. The atom is pumped via a quadrupole transition from the 3s to the 4d state with a single photon at 2894 Å. Intense coherent emission at 3427 Å corresponding to the 3d-3s transition can be observed exiting the Na cell only in the direction parallel to the input beam. Also observed coming from the cell is intense coherent light at 2.34 µm corresponding to the 4d-4s transition in Na.
STIMULATED EMISSION BASED ON TWO-STEP HYBRID RESONANCE A1Σu+A^{1}\Sigma_{u}^{+}A1Σu+​ OR B1ΠuB^{1}\Pi_{u}B1Πu​ STATE OF Na.∗Na.^{*}Na.∗
The first step of the hybrid excitation in the experiment was achieved by using a pulse broadband ($\\sim$200 {\\AA}) dye laser beam through a heat pipe oven. But the total covered pumping wavelength region from 4600 {\\AA} to 6800 {\\AA} the populated upper electronic state in Na2Na_{2}Na2​ should be either AprimeSigmauA^{\\prime}\\Sigma_{u}AprimeSigmau​ or BprimePiuB^{\\prime}\\Pi_{u}BprimePiu​ state. The excited sodium dimers Na2astNa_{2}^{\\ast}Na2ast​ transfered their energy to sodium atoms Na by near resonace collisions and the Na then would populate up the 3P level from ground state 3s. The Na were consequentely pumped up to 4D, 5D, 5S or 6S level from 3P by using a narrowband dye laser pumped by the same N2N_{2}N2​ laser. The infrared stimulated radiation corresponding to the transitions of 4D-4P(2.34 mu\\mumum). 5D-4P(5.02mu\\mumum), 5S-4P(3.42 mu\\mumum) and 6S-5P(7.52 mu\\mumum) with cascade stimulated emission from 4P to 4S (2.20 mu\\mumum) and from 5P to 5S (5.43 mu\\mumum) were then obtained, Furthermore the dependence of the output energy on the pumping wavelengthes was measured and discussed.
Stimulated emission on the ultraviolet and blue transitions in Cs has been achieved by pumping via two-photon absorption and four-wave mixing for the pump transition 62S12→82D32,52. The emission performance of the optically pumped cesium vapor laser operating in ultraviolet and blue has been extended to 650 nJ/pulse for 387 nm, 1 to 3 μJ/pulse for 388 nm, 200 nJ/pulse for 455 nm, and 500 nJ/pulse for 459 nm. Emission performance improves dramatically as the cesium vapor density is increased, and no scaling limitations associated with energy pooling or ionization kinetics have been observed.