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Acta Optica Sinica

Stimulated emission based on two-step hybrid resonance via A~1∑_u or B~1II_u state of Na_2

Lei Qin

Published Jan 1, 1986• 0 citations
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Abstract

Stimulated emission based on two-step hybrid resonance via A1∑u or B1∏u state of Na2 has been observed by using a broad-band and a narrow-band dye laser as pumping sources. The maclunism is discussed.

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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.

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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

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Stimulated Emission via Unequal Frequency Two-Step Hybrid Resonance in K Vapor

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Conversion of the luminescence of laser dyes in opal matrices to stimulated emission

Olimkhon K. Alimov, Tasoltan T. Basiev, Yu.V. Orlovskii +2 more

The luminescence and laser characteristics of a synthetic opal matrix filled with organic dyes are studied upon excitation by nanosecond laser pulses. The appearance of stimulated emission in a partially ordered scattering medium is investigated. It is shown that if the luminescence spectrum of a dye (oxazine-17) is located far outside the photonic bandgap of the opal matrix, stimulated emission along a preferential direction in the (111) plane is observed when pumping exceeds a threshold even without an external optical cavity. The stimulated emission spectrum is considerably narrower than the luminescence spectrum and consists of several narrow lines located within the dye luminescence band. If the luminescence spectrum of a dye (rhodamine 6G) overlaps with the photonic bandgap of the opal matrix, a different picture is observed. The loss of radiation in the matrix leads to the red shift of the luminescence spectrum, while the stimulated emission as in the case of oxazine-17 lies is observed within the luminescence band.

Quantum Electronics•Jul 31, 2008•11 citations
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.
The luminescence and laser characteristics of a synthetic opal matrix filled with organic dyes are studied upon excitation by nanosecond laser pulses. The appearance of stimulated emission in a partially ordered scattering medium is investigated. It is shown that if the luminescence spectrum of a dye (oxazine-17) is located far outside the photonic bandgap of the opal matrix, stimulated emission along a preferential direction in the (111) plane is observed when pumping exceeds a threshold even without an external optical cavity. The stimulated emission spectrum is considerably narrower than the luminescence spectrum and consists of several narrow lines located within the dye luminescence band. If the luminescence spectrum of a dye (rhodamine 6G) overlaps with the photonic bandgap of the opal matrix, a different picture is observed. The loss of radiation in the matrix leads to the red shift of the luminescence spectrum, while the stimulated emission as in the case of oxazine-17 lies is observed within the luminescence band.