© 2026 Aqora Quantum S.A.S.

Terms Privacy Legal Notice

International Laser Science Conference

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

Zugeng Wang, Xiaoling Tang, Kai-Chang Zhang, Lijuang Qin, L-Shen Cheng

Published Jan 1, 1986• 0 citations

Abstract

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.

DOI: 10.1364/ils.1986.thl23

Related papers

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

UV and violet stimulated diffuse band radiation by two-photon pumping in Na2

Zugeng Wang, Kai-Chang Zhang, Xiao-Ling Tang +1 more

This paper reports the UV and violet diffuse band radiation generated by two-photon pumping in Na2 by focusing the pumping beam (~ 10 mJ) from a pulsed dye laser into a heat-pipe oven containing sodium. Measurable forward stimulated diffuse band radiation existed at 350.0-385.0 nm and 405.0-460.0 nm over the whole pumping region from 620.0 to 670.0 nm. The radiation corresponded to transitions from different high-lying triplet g states to the lowest triplet state. The signal intensity related to the pumping wavelength. The stronger signals were there where two-photon pumping was enhanced by singlet-triplet mixing levels. The weaker signals were assumed to relate to the collisions either transferring energy from the A ′ Σ u + to the b3Π g state after the first photon excitation and then pumped by the second photon excitation from the b3Π g state to a high-lying state, or were due to collisional transfer from a high-lying singlet to a nearby triplet state.

International Laser Science Conference•Jan 1, 1986•0 citations

Observation of stimulated emission of Na2 at 0.75-0.80 µm by UV excitation

Yuezhen Sun, Zhongxian Chen, Miao Du

We describe the first observation of stimulated emission at 0.75–0.80 µm and at 1.06–1.14 µm in sodium vapor at 580°C and 0.5-Torr buffer argon pressure by single-UV-photon or two-visible-photon pumping. For our pumping source, we used a XeCl excimer laser (EMG 101)–dye laser (FL2002), wavelengths 3375.93-Å (PTP) and 5772.8- Å (Rh6G) for single-photon and two-photon excitation with 0.16- Å linewidth and 10-nm pulse width; heating zone of the heat-pipe 25 cm.

Annual Meeting Optical Society of America•Jan 1, 1986•0 citations

TUNABLE UV COHERENT RADIATION GENERATED BY 2-PHOTON HYBRIDRESONANCE IN Na_2-Na

Xiaoli An

The tunable UV coherent radiation in the wavelength regions of 337.66—339.41 nm and 358.04—359.59 nm generated by 2-photon hybrid resonance 4—wave mixing in sodium molecular and atomic systems has been first reported. The mechanism is carefully analyzed and the results are compared with the conventional 2-photon resonance 4-wave mixing effect in pure sodium atomic systems.

Science China Mathematics•Jan 1, 1987•0 citations

New process for generating broadly tunable UV coherent radiation: two-step hybrid resonance four-wave mixing in molecule-atom system

Shilan Deng, Lijuan Qin, H. Y. Jin +2 more

Tunable UV coherent radiation in the wavelength region 319.2 nm to approximately 354.2 nm has been generated by unequal-frequency hybrid resonance of Na2-Na system and followed four-wave mixing. The wave-mixing processes and experimental results are discussed.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Oct 28, 1992•0 citations

Broadly tunable UV coherent radiation generated by two-step hybrid resonance four-wave mixing in Na2-Na mixture

Shilan Deng, L J Qin, H Y Jin +2 more

By unequal-frequency hybrid resonance followed by hybrid resonance four-wave mixing in Na2-Na mixture, broadly tunable UV coherent radiation in the wavelength region 319.2-354.2 nm has been generated. The experimental and theoretical analysis have been focused on the particular mechanism and the features of the UV coherent radiation.

Journal of Physics B Atomic Molecular and Optical Physics•Aug 14, 1994•0 citations

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.

STIMULATED EMISSION BASED ON TWO-STEP HYBRID RESONANCE

A^{1}\Sigma_{u}^{+}

OR

B^{1}\Pi_{u}

STATE OF

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

Na.^{*}

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.

This paper reports the UV and violet diffuse band radiation generated by two-photon pumping in Na2 by focusing the pumping beam (~ 10 mJ) from a pulsed dye laser into a heat-pipe oven containing sodium. Measurable forward stimulated diffuse band radiation existed at 350.0-385.0 nm and 405.0-460.0 nm over the whole pumping region from 620.0 to 670.0 nm. The radiation corresponded to transitions from different high-lying triplet g states to the lowest triplet state. The signal intensity related to the pumping wavelength. The stronger signals were there where two-photon pumping was enhanced by singlet-triplet mixing levels. The weaker signals were assumed to relate to the collisions either transferring energy from the A ′ Σ u + to the b3Π g state after the first photon excitation and then pumped by the second photon excitation from the b3Π g state to a high-lying state, or were due to collisional transfer from a high-lying singlet to a nearby triplet state.