IEEE Journal of Quantum Electronics

Issue 2  Part 2 • February 1974

 This issue contains several parts.Go to:  Part 1 

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Displaying Results 1 - 25 of 27
  • Preface

    Publication Year: 1974, Page(s): 137
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    Freely Available from IEEE
  • Generation of single 1-ns pulses at 10.6 u without mode locking

    Publication Year: 1974, Page(s):138 - 140
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (290 KB)

    Pulses of 1-ns duration have been generated at 10.6μ without mode locking the CO2oscillator. A scheme is described which allows generation of a single pulse or a pair of pulses with adjustable spacing between pulses. View full abstract»

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  • Superradiant emission at 5106, 5700, and 5782 Å in pulsed copper iodide discharges

    Publication Year: 1974, Page(s):140 - 147
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (941 KB)

    Superradiant laser emission at 5106, 5700, and 5782 Å is reported from pulsed discharges in copper iodide vapor at temperatures near 600°C. This conclusion is supported by pulse shortening of the visible emission and a marked increase in the relative visible intensity compared to the copper resonance radiation as the critical temperature range is approached. Electrical dissociation of th... View full abstract»

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  • A simple high-power large-efficiency N2ultraviolet laser

    Publication Year: 1974, Page(s):147 - 153
    Cited by:  Papers (68)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (542 KB)

    The conditions for population inversion between theC^{3}Pi_{u}andB^{3}Pi_{g}levels (lambda = 3371Å) of N2such as the excitation time and the optimum value ofE/pare calculated. To meet the required conditions for a very fast population inversion, we describe a traveling wave laser structure which is very simple. We study the experimental c... View full abstract»

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  • Review of ultraviolet laser physics

    Publication Year: 1974, Page(s):153 - 174
    Cited by:  Papers (71)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2676 KB)

    A review of the status and properties of coherent sources of ultraviolet radiation is presented. This includes a wide range of developments concerning atomic and molecular systems useful for generating wavelengths below 4000 Å, as well as progress in alternative methods of ultraviolet production. Particular emphasis is placed on recent advances in molecular bound-free systems whose operation ... View full abstract»

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  • Modulation technique to control laser material processing

    Publication Year: 1974, Page(s):175 - 178
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (368 KB)

    A modulation technique based on laser spiking is described. Due to its reproducibility and simplicity, this technique is well suited to adapt the laser emission to the kinetics of laser machining. Spike power and half width are derived by using nonlinear approximations. View full abstract»

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  • Metal processing with a high-power CO2laser

    Publication Year: 1974, Page(s):179 - 185
    Cited by:  Papers (25)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1242 KB)

    Experimental studies involving laser welding, cutting, and surface heat treating have been performed over the past two years at power levels of 4-16 kW, using an electron-beam stabilized CW Co2laser [1], [2]. Deep penetration welds have been made in a variety of materials including carbon and stainless steels, titanium, and aluminum. In all cases, normalized welding speeds and penetrati... View full abstract»

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  • Comparison of GaAs and CdTe crystals for high-frequency intracavity coupling modulation of CO2lasers

    Publication Year: 1974, Page(s):186 - 191
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (558 KB)

    High-frequency intracavity coupling modulation of the CO2laser has recently attracted considerable interest as an efficient means of achieving wide-bandwidth modulation with low modulator drive power. In the present investigation, intracavity coupling modulation was achieved at 1 GHz. Both GaAs and CdTe crystals were investigated and an optical beat method was used to explore the operat... View full abstract»

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  • Identification of absorption lines in gases used to modulate the CO2laser

    Publication Year: 1974, Page(s):191 - 195
    Cited by:  Papers (12)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (683 KB)

    The absorption lines in methyl bromide, vinyl chloride, and 1, 1 difluoroethylene used to modulate the CO2laser lines have been spectroscopically observed using a spectrometer which uses the signal generated by mixing a CO2laser and a millimeter wave klystron in a gallium arsenide loaded waveguide as a source. The results indicate that Stark modulation with symmetric top mole... View full abstract»

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  • Solid-state laser technology

    Publication Year: 1974, Page(s):195 - 201
    Cited by:  Papers (7)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (663 KB)

    There exists a need for laser systems with wavelength diversity and a high energy per pulse. This may be achieved with an Nd:YAG oscillator amplifier system operated either at 1.06 or 1.33μ. Methods of obtaining oscillation at 1.33μ by suppressing the oscillation at 1.06 μ are presented. The energy per pulse from a laser oscillator can be increased by minimizing thermal problems. On... View full abstract»

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  • Power-dependent correction to the scale factor in the laser gyro

    Publication Year: 1974, Page(s):201 - 208
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (708 KB)

    Scale factor experiments were performed using an internal-mirror quartz-block 1.15-μm He-Ne laser, having a cavity length of 9.868 cm. The configuration was an equilateral triangle and the nominal geometric scale factor was1.035 times 10^{5}counts per revolution. To avoid lock-in (20°/s) the laser was rotated at rates of5000-9000deg/s. Using an equal mixture of neon... View full abstract»

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  • High-pressure electrical CO laser

    Publication Year: 1974, Page(s):208 - 213
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (659 KB)

    A description is given of the development and performance of a 20-1 cryogenically cooled electric CO laser designed for pulsed operation at pressures up to 1 atm. The gas is excited by an electron-beam-sustained discharge. Output pulse energies in excess of 1 kJ have been observed with a total electrical efficiency of approximately 15 percent. View full abstract»

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  • The plasma-cathode electron gun

    Publication Year: 1974, Page(s):213 - 218
    Cited by:  Papers (14)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (649 KB)

    The development of a new type of plasma-cathode electron gun suitable for pulsed as well as CW operation withe-beam lasers is reported. This device employs a plasma generated within a low-voltage hollow-cathode discharge rather than a thermionic emitter as the source of electrons. Electrons extracted from the plasma pass through a triode-type control grid structure and are accelerated t... View full abstract»

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  • Optical deflection in thin-film nematic-liquid-crystal waveguides

    Publication Year: 1974, Page(s):218 - 222
    Cited by:  Papers (5)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (535 KB)

    The phase velocities of the optical waves guided in nematic-liquid-crystal waveguides can be electrically modulated by about 10 percent. Optical deflection in such waveguides are demonstrated in a configuration with an electric field applied across a film of thickness of the order of 1 μ. Effective index of refraction is changed by about 0.01/volt. Response time of the effect is in the millis... View full abstract»

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  • Optical second-harmonic generation due to guided-wave structure consisting of quartz and glass film

    Publication Year: 1974, Page(s):222 - 229
    Cited by:  Papers (27)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (748 KB)

    This paper discusses optical second-harmonic generation (SHG) using phase-matching phenomena among the guided modes. The phase-matched film thickness, the phase-mismatching coefficient due to the variation of film thickness, and the gain reduction factor of the guiding structure are generally discussed here. The scattering loss originating from the boundary of the guide structure restricts the ope... View full abstract»

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  • A 10.6-um terrestrial communication link

    Publication Year: 1974, Page(s):230 - 235
    Cited by:  Papers (15)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (827 KB)

    An experimental one-way 8-Mb/s 10.6-μm laser communication system that utilizes optical FM and heterodyne detection has been engineered to allow continuous operation through a variety of weather conditions. Performance over paths of 3 mi and 20 mi is described. Nearly 2000 h of data have been accumulated, including one continuous run of 1320 h with less than 5 percent downtime due to weather. View full abstract»

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  • Aerosol clearing with a 10.6-um precursor pulse

    Publication Year: 1974, Page(s):235 - 238
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (461 KB)

    The breakdown threshold for a 10.6-μm 200-ns laser pulse in air filled with carbon particles was increased by application of a low-intensity high-fluence precursor pulse, When the beam contained many particles with diametersleq4 mum, the threshold was raised to within a factor of ≃3 of clean air with a 40-J/cm2precursor. With single 50-μm particles in the beam... View full abstract»

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  • Cold cathodes for sealed-off CO2lasers

    Publication Year: 1974, Page(s):239 - 244
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (429 KB)

    Cold cathodes for CO2lasers should possess a very low sputtering rate, have a minimum of negative ions in the sputtering products, and consume no oxygen. These conditions can be satisfied by selecting cathode materials from those elements of group I in the periodic table which form semiconducting oxide layers and then exposing these elements to a reducing gas mixture. Experimental resul... View full abstract»

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  • CW high-pressure tunable CO2laser with a mixture of CO2isotopes

    Publication Year: 1974, Page(s):245 - 247
    Cited by:  Papers (14)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (310 KB)

    The qualitative theory of the CO2laser at atmospheric pressure was developed. Investigations of a CW CO2laser at high pressure with conventional and waveguide resonators and obtaining CW oscillation in the mixture of three isotopic molecules,12C16O2,12C16O18O, and12C18O2, are re... View full abstract»

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  • New phase-matchable nonlinear optical crystals of the formate family

    Publication Year: 1974, Page(s):247 - 252
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (597 KB)

    New nonlinear optical orthorhombic formate crystals HCOONa and HCOOLi0.9Na0.1H2O have been grown from aqueous solutions in order to extend the transparency to the near infrared region. Their transmission characteristics, refractive indices, and Sellmeier's dispersion relations, together with nonlinear optical properties associated with second-harmonic generation (S... View full abstract»

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  • Efficient frequency-doubled single-frequency Nd:YAG laser

    Publication Year: 1974, Page(s):253 - 263
    Cited by:  Papers (17)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1255 KB)

    The design and operation of an efficient stable frequency-doubled single-frequency Nd :YAG laser providing a unidirectional harmonic output is discussed. Efficient resonant cavity designs utilizing the Nd:YAG rod as an internal focusing element were used to provide adequate TEM00-mode volume in the rod and a small beam waist at the nonlinear crystal (Ba2NaNb5O... View full abstract»

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  • CW mode-locked source at 0.532 u

    Publication Year: 1974, Page(s):263 - 267
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (902 KB)

    Using external second-harmonic generation (SHG) in Ba2NaNb5O15, a second-harmonic (SH) power of 550 mW, mode locked at 453 MHz has been demonstrated. Short- and long-term stabilities of better than ±5 percent peak-to-peak variation have been obtained at up to the 400- mW level. The maximum stable SH power was limited by absorption of the SH by the Ba2 View full abstract»

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  • High-energy amplifiers for the LASL glass-laser system

    Publication Year: 1974, Page(s):267 - 272
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1627 KB)

    Rod amplifiers of 51-mm diameter and disk amplifiers with diameters of 51 and 86 mm were designed and some units have been built for use in a four-beam high-energy glass laser at the Los Alamos Scientific Laboratory (LASL). The design goals and measured characteristics of these amplifiers are discussed. Data on self-focusing damage in both rods and disks are presented. Important characteristics of... View full abstract»

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  • Far-infrared radiation isolator

    Publication Year: 1974, Page(s):273 - 279
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (628 KB)

    In some CO2laser systems it is necessary to isolate the amplifier sections from reflected light, n-type InSb is shown to be the best semiconductor to use in a free electron Faraday isolator. Theoretical properties of such a device are discussed and compared with measurements made on a prototype isolator. View full abstract»

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  • Asymmetric unstable traveling-wave resonators

    Publication Year: 1974, Page(s):279 - 289
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1321 KB)

    Experimental data pertaining to the intracavity propagation characteristics, the mode volume dissimilarity, and the fractional output coupling Characteristics associated with the oppositely traveling waves in CO2asymmetric unstable ring resonators are reported. Equivalence relations are derived, extending Siegman's unstable resonator analysis to encompass asymmetric traveling-wave geome... 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.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Prof. Hon Ki Tsang
Chinese University of Hong Kong