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Quantum Electronics, IEEE Journal of

Issue 11 • Date November 1980

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Displaying Results 1 - 25 of 28
  • [Front cover and table of contents]

    Publication Year: 1980 , Page(s): 0
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  • Introduction--Special issue on laser photochemistry

    Publication Year: 1980 , Page(s): 1150 - 1151
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  • Introduction to section I--Laser spectroscopy and analysis techniques

    Publication Year: 1980 , Page(s): 1152 - 1153
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    First Page of the Article
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  • Computer controlled IR spectrometer using a color center laser

    Publication Year: 1980 , Page(s): 1154 - 1157
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    A high resolution IR spectrometer for the 2.2-3.3\mu m range has been developed using a computer controlled CW color center laser. Computer control makes possible single-frequency scans of up to 100 cm-1with a resolution determined by the cavity mode spacing (250 MHz) and continuous high resolution scans (linewidth below 1 MHz) over 1 cm-1ranges. The laser spectrometer has been tested on the NO overtone band at 2.68 μm. View full abstract»

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  • Comparison of experimental and theoretical excited-state spectra for rhodamine 6G

    Publication Year: 1980 , Page(s): 1157 - 1160
    Cited by:  Papers (2)
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    The stimulated emission cross section (σe) and the excited-state absorption cross section ( \sigma * ) for this dye are resolved across the fluorescence and the lowest energy ground-state absorption bands. The absorption is weak ( \sim0.4 \times 10^{16} cm2), particularly at the longer wavelengths [Fig. 3(c)]. Lasing properties are predicted from Fig. 4(b), which shows a plot of the (σe) curve displaced with respect to the S1state as the zero-energy level of reference, on top of the long-axis polarized ground-state absorption band. Spectral assignments are proposed in terms of symmetry arguments based on this observation. View full abstract»

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  • Introduction to section II - Laser devices

    Publication Year: 1980 , Page(s): 1183 - 1184
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  • A study of selective absorbers for single-mode operation of CO2TEA lasers

    Publication Year: 1980 , Page(s): 1192 - 1194
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1010 KB)  

    An investigation of the generality of intracavity selective absorbers for single-longitudinal mode operation of a high power CO2TEA laser has been conducted. SLM operation on 36 different CO2lines was obtained with 14 different selective absorbers. Typical off line-center tuning ranges are also reported. Maximum off line-center offset, limited by the detection equipment, was 300 MHz. These results demonstrate the method to be a general as well as a simple technique for applications requiring a SLM laser, and suggest that the method will have important device applications. View full abstract»

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  • Absolute frequencies of lasing transitions in seven CO2isotopic species

    Publication Year: 1980 , Page(s): 1195 - 1206
    Cited by:  Papers (13)
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    The band centers, rotational constants, absolute frequencies, and vacuum wavenumbers for12C16O2,13C16O2,12C18O2,13C18O2,12C16O18O,14C16O2, and14C18O2have been simultaneously computed from 590 beat frequency measurements between pairs of adjacent 00\deg 1-[10\deg 0,02\deg 0] I and II band CO2laser transitions. The input data included the 56 beat frequencies measured between adjacent12C16O2rotational lines by Petersen et al. The absolute frequencies are directly related to the cesium frequency standard via the 29 442 483.315 (0.025) MHz 10.18 μm I-R (30) and the 32 134 266.891 (0.024) MHz 9.33 μm II-R(10) transitions in12C16O2which were measured by Evenson et al. The results described in this paper will provide the means for setting up easily reproducible secondary frequency standards in the 8.9-12.3 \mu m wavelength band. View full abstract»

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  • Introduction to section III - Chemical reactions initiated by lasers

    Publication Year: 1980 , Page(s): 1207
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  • Application of laser photolysis to the study of reactive intermediates

    Publication Year: 1980 , Page(s): 1218 - 1222
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    Excimer laser flash photolysis in the study of diphenyl carbene (DPC) reveals the presence of at least three transient species produced by excitation of a precursor at 249 nm in isooctane solution at room temperature depending on the concentration of O2present. In an aerated solution, a fast first-order decay assigned to3DPC leads to the formation of an unassigned species which also decays by first order kinetics to produce the observed product Ph2CO. In degassed solution, the fast first-order decay of a species to produce3DPC which decays by second-order kinetics to produce the dimeric products observed. View full abstract»

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  • 200 W KrF gas transport laser

    Publication Year: 1980 , Page(s): 1260 - 1262
    Cited by:  Papers (5)
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    This paper describes the design and operation of a closed cycle, gas transport, krypton fluoride laser which has generated an average output power of over 200 W while operating at a pulse repetition rate of 1 kHz. View full abstract»

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  • [Back cover]

    Publication Year: 1980 , Page(s): 0
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  • Theoretical and experimental studies of a multiline TEA CO2laser with hot CO2as an intracavity absorber

    Publication Year: 1980 , Page(s): 1263 - 1266
    Cited by:  Patents (1)
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    The multiline behavior of a ballast resistance helical TEA CO2laser incorporating hot CO2as an intracavity absorber has been studied. Simultaneous laser oscillation on P(16), P(18) , and P(20) lines of 10.6 μm has been obtained reliably. A rate equation model has been developed for the hot CO2absorber and is incorporated with the model for the multiline TEA CO2laser for calculating laser intensities on P(16), P(18), P(20) , and P(22) lines of the 10.6 μm band in the presence of the absorber. The theoretical calculations agree quite well with the experimental observations. These studies show that a hot CO2column of Proper length and temperature inside a TEA CO2laser cavity can produce simultaneous laser oscillation on at least three rotational lines P(16), P(18) , and P(20) of the 10.6 μm band with almost equal intensity. View full abstract»

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  • Beam shapes in a three-frequency upconverter

    Publication Year: 1980 , Page(s): 1272 - 1275
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    The transverse beam shape of the signal output from a three-frequency parametric upconverter was investigated both theoretically and experimentally. A Green's function approach was used to predict the near- and far-field signal profiles in an upconverter where Poynting vector walkoff is significant. The measured output beam profiles from a lithium iodate-argon intracavity upconverter agreed well with those predicted. In the near field, walkoff caused an elongation of the beam profile. In the far field, walkoff was observed to limit the angular acceptance of the upconversion process. View full abstract»

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  • Electrical interactions of a superlinear laser diode with its external circuit

    Publication Year: 1980 , Page(s): 1248 - 1250
    Cited by:  Papers (1)
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    Self-induced fluctuations in diode voltage and current are shown to accompany the random optical fluctuations exhibited by AlGaAs junction lasers with superlinear emission characteristics. As a result, resonant interactions between the laser diode and a passive external electrical circuit produce coherent oscillations in the optically emitted power. Analysis of the conditions under which these resonantly induced oscillations occur shows that the intrinsic laser instability is current, not voltage, sensitive. No evidence is found, however, for a resonant-like behavior intrinsic to the laser itself. View full abstract»

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  • Molecular photodissociation by an ultraviolet photon

    Publication Year: 1980 , Page(s): 1208 - 1218
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    The laser has greatly expanded the study of photodissociation dynamics. By generating large concentrations of fragments using monochromatic light, the laser enables the measurement of their final state distribution. This distribution over translational, vibrational, and rotational states combined with the conservation of energy and linear and angular momentum allows us, in principle, to calculate the forces acting in the excited state. A review of experimental results so far obtained shows that: 1) for diatomics the quantum states of the dissociated atoms can now be directly determined, 2) for triatomics the excess of photon energy over dissociation energy appears in comparable amounts in vibrational and translational energy with rotational energy often substantial as well (ICN and H2S are exceptions), 3) in complex molecules optical energy is absorbed in one part of the molecule and utilized in another with resulting intramolecular transfer of energy. View full abstract»

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  • Near- to far-infrared tunable Raman laser

    Publication Year: 1980 , Page(s): 1184 - 1191
    Cited by:  Papers (2)
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    The importance of stimulated Raman scattering of tunable laser beams in molecular fluids for generating powerful infrared radiation tunable from the near to the far infrared (FIR) is demonstrated. Main criteria (frequency shift, transparency, and Raman gain) leading to the choice of the best Raman medium for a given tunable laser are discussed. For the high power (400-1000 MW), monochromatic (0.02 cm-1), and broadly tunable ( 0.72-1.09 \mu m) ruby pumped dye laser described here, gaseous hydrogen is chosen for the 1-10 \mu m wavelength region yielding powers ranging from 1 to 200 MW. For mid-infrared (IR) generation ( 10-18 \mu m), one more Raman shifting in liquid nitrogen permits one to obtain up to 1.7 mJ in the 16 μm region. For longer wavelengths the use of resonantly enhanced stimulated Raman scattering in hydrogen fluoride gives rise to the generation of powerful radiation ( 2 \times 10^{17} photons per pulse of 2.5 ns duration) tunable over half of the 40-250 \mu m spectral range. View full abstract»

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  • Emission frequencies of the CF4laser

    Publication Year: 1980 , Page(s): 1164 - 1169
    Cited by:  Papers (3)
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    104 (\nu_{2} + \nu_{4}) \leftarrow \nu_{2} hot-band transitions, some of which correspond to known (\nu_{2} + \nu_{4}) \leftarrow \nu_{2} CF4laser lines, have been identified and measured in high-resolution Doppler-limited spectra of12CF4near 16 μm, obtained with a tunable diode laser. From an analysis of these frequencies, the rotational and tensor splitting constants for the ν2vibrational level have been determined. These constants, together with the \nu_{2} + \nu_{4} pump-band spectrum previously obtained, allow the laser emission frequencies for any given CO2pump line to be calculated with an accuracy of 0.01-0.003 cm-1. View full abstract»

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  • Photonitration of hydrocarbons with lasers

    Publication Year: 1980 , Page(s): 1227 - 1229
    Cited by:  Papers (1)  |  Patents (1)
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    The photonitration of isobutane (i-C4H10) has been investigated in the 458-515 nm region with an argon-ion laser as the radiation source, t-nitrobutane (t-C4H9NO2) was the major product. Its rate of production was linear with laser intensity and increased with increasing photon energy. Computer modeling of possible reaction steps indicated that the reaction is initiated by the direct abstraction of hydrogen from i-C4H10by electronically excited NO2. View full abstract»

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  • Laser microphotochemistry for use in solid-state electronics

    Publication Year: 1980 , Page(s): 1233 - 1243
    Cited by:  Papers (6)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4392 KB)  

    A focused, ultraviolet (UV) laser beam has been used to produce micrometer-sized chemical processes on solid surfaces. These processes are initiated by the photodissociatlon of a molecular gas in the vicinity of the gas-solid interface. Depending on whether the active photofragment reacts with or is adsorbed on the solid, microetching or microdeposition occurs. Both the surface properties of the solid and the gas-phase kinetics contribute to the process localization. Metal alkyls and methyl halides have been used as parent molecules for deposition and etching, respectively. A focused, 3 mW UV laser is sufficiently intense to produce satisfactory rates for both processes. Several applications of this small-scale photochemistry to microelectronics have been investigated. View full abstract»

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  • Radiation trapping in a laser dye medium, rhodamine 6G in alcohol

    Publication Year: 1980 , Page(s): 1161 - 1163
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    Prolonging of decay time τ due self-absorption of fluorescence is estimated from the spectra for a cylinder of infinite length. The basis of the calculation is the "a" factor-the probability of self-absorption of an emitted photon, which is solved by a Monte-Carlo integration. For the experimental conditions used in a typical flashlamp-pumped dye oscillator, the molecular decay time of 3.5 ns is extended to 4.8 ns, and does not change as the oscillator is scaled in dimension. It is the prolonged τ that determines pump and signal saturation fluxes, lowering the fluxes, and such radiation trapping contributes significantly to making rhodamine 6G an effective laser dye. View full abstract»

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  • Birefringence in single-mode optical fiber due to elliptical core deformation and stress anisotropy

    Publication Year: 1980 , Page(s): 1267 - 1271
    Cited by:  Papers (22)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1352 KB)  

    A formula for the difference between propagation constants of two polarization modes caused by elliptical core deformation and stress anisotropy is given for single-mode optical fibers. Birefringence in circular and elliptical core fibers subject to an externally applied uniaxial pressure are measured. Birefringence caused by elliptical core deformation and stress anisotropy are experimentally separated by measuring their wavelength dependences. A value of 3.36 \times 10^{-10} cm2/gram weight (gw) (= 3.43 \times 10^{-12} m2/N) is obtained for the stress-optical constant of silica fibers. Residual stress corresponding to external pressure of 240 gw/cm is observed for a fiber with 0.35 core ellipticity. View full abstract»

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  • Measurement of the wavelength-dependent photoionization cross section of Se*(1S) in the spectral region of 170-175 nm

    Publication Year: 1980 , Page(s): 1170 - 1173
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    The photoionization cross section of excited atomic selenium, Se(1S0), obtained by photodissociation of OCSe, has been measured in the wavelength region of 170-175 nm using a tunable xenon laser. A minimum value, at 172 nm, was found to be 1.2 \times 10^{-20} cm2, approximately ten times less than a recently calculated value. The photodissociation cross section for OCSe, at the same wavelength, was found to be 0.8 \times 10^{-16} cm2, in good agreement with published work. The effect of an election cooling buffer gas upon the electron production from excited selenium was also investigated. View full abstract»

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  • Laser cleanup of H2S from synthesis gas

    Publication Year: 1980 , Page(s): 1229 - 1232
    Cited by:  Papers (2)
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    Hydrogen sulfide at the 10 ppm level has been selectively stripped from a CO + H2synthesis gas by photolysis with an ArF laser. The sulfur in the atomic or radical form is irreversibly removed by a metal surface. Spectroscopic and quantum yield data are presented. An H2S spectroscopic selectivity less than 107was measured in the 210-220 nm range, a wavelength range compatible with Raman-shifted ArF or KrF lasers. The laser purification method described here is a potential approach to achieve sulfur impurity levels greater than 0.1 ppm. This method is of potential industrial significance for extending the lifetime of syngas metal catalysts. View full abstract»

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  • Initiation of NF3-H2chemical reactions via CO2laser irradiation of NF4BF4

    Publication Year: 1980 , Page(s): 1223 - 1226
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    NF4BF4has been irradiated with a low-power CO2laser to produce reactive species which then initiate reactions in an ambient NF3-H2mixture. The laser-induced decomposition of NF4BF4in vacuum was measured as a function of laser power and energy. The laser-induced decomposition threshold was determined to be 40 mJ, which corresponds to a laser fluence of 20 J/cm2. This same value was determined for the initiation threshold of NF3-H2reactions via CO2laser irradiation of NF4BF4. Visible and infrared emissions were observed from initiated NF3-H2mixtures. This radiative technique has attractive features for initiating reactions in solid-gas systems. View full abstract»

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Aims & Scope

The IEEE Journal of Quantum Electronics is dedicated to the publication of manuscripts reporting novel experimental or theoretical results in the broad field of the science and technology of quantum electronics..

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Meet Our Editors

Editor-in-Chief
Aaron R. Hawkins
Brigham Young University