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15 Apr 1970

Volume 16, Issue 8, pp. 291-327


ELASTIC WAVES GUIDED BY A FLUID LAYER: A NEW TYPE OF ULTRASONIC WAVE PROPAGATION

W. C. Wang, P. Staecker, and R. C. M. Li

Appl. Phys. Lett. 16, 291 (1970); http://dx.doi.org/10.1063/1.1653199 (3 pages) | Cited 8 times

Online Publication Date: 21 October 2003

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A new type of guided ultrasonic wave bound to a fluid layer between two elastic solids has been observed. Quantitative agreement has been obtained between experiment and theory.

ELASTIC SURFACE WAVES IN THE PRESENCE OF FLUID LAYER

P. Das and M. N. Araghi

Appl. Phys. Lett. 16, 293 (1970); http://dx.doi.org/10.1063/1.1653200 (3 pages) | Cited 6 times

Online Publication Date: 21 October 2003

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The presence of a liquid layer on the Rayleigh wave delay line is found to increase the original delay by a factor of 2 with loss of only a few percent in amplitude. Different modes with variable delay can be excited simultaneously and can be picked up by another transducer in contact with liquid layer. Possible uses of thin layer waves as an acoustic interferometer are discussed.

ACOUSTIC PARAMETRIC OSCILLATIONS IN LiNbO3

R. B. Thompson and C. F. Quate

Appl. Phys. Lett. 16, 295 (1970); http://dx.doi.org/10.1063/1.1653201 (4 pages) | Cited 19 times

Online Publication Date: 21 October 2003

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We report on the observation of backward wave acoustic oscillations in LiNbO3. We have confined our study to fast shear waves propagating along the x axis, and we have been successful in generating these waves at a frequency of 1.43 GHz with a spatially uniform electric field at 2.86 GHz applied along the z axis. In addition, it has been possible to observe 60 dB of gain for an injected acoustic signal. Maximum peak strains are estimated to be in excess of 5 × 10−4.

OPTICAL NONLINEAR SUSCEPTIBILITIES OF LITHIUM IODATE

J. Jerphagnon

Appl. Phys. Lett. 16, 298 (1970); http://dx.doi.org/10.1063/1.1653202 (2 pages) | Cited 37 times

Online Publication Date: 21 October 2003

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The nonlinear coefficients of lithium iodate have been measured, relative to quartz, by the Maker fringe technique.
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for the fundamental wavelength 1.064μ. It has also been determined that d31 and d33 have the same sign.

RESONANT AMPLIFICATION AND COUPLING OF ACOUSTIC SURFACE WAVES WITH ELECTRONS DRIFTING ACROSS A MAGNETIC FIELD

Abraham Bers and B. E. Burke

Appl. Phys. Lett. 16, 300 (1970); http://dx.doi.org/10.1063/1.1653203 (4 pages) | Cited 7 times

Online Publication Date: 21 October 2003

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We show that acoustic surface waves on a piezoelectric can be resonantly amplified by coupling to a weakly damped carrier surface wave on an adjacent semiconductor in which the conduction electrons are made to drift across an applied magnetic field. The conditions for such a wave‐wave interaction are established, and calculations of the growth rate and its characteristics are given. Under the same conditions, reversing the direction of the magnetic field changes the amplifier to an almost loss‐free, tunable, coupler.

LOW‐POWER QUASI‐cw RAMAN OSCILLATOR

E. P. Ippen

Appl. Phys. Lett. 16, 303 (1970); http://dx.doi.org/10.1063/1.1653204 (3 pages) | Cited 56 times

Online Publication Date: 21 October 2003

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Quasi‐cw stimulated Raman emission in the visible has been obtained from an oscillator cavity with a pump‐power input of less than 5W. This large reduction of oscillator threshold is achieved with the use of a liquid‐core optical waveguide structure. Significant conversion of pump to Stokes light has been observed. Extension of the system to continuous operation and to the study of other nonlinear effects is suggested.

MAGNETOSTATIC SURFACE MODES IN AN AXIALLY MAGNETIZED ELLIPTICAL CYLINDER

R. E. De Wames and T. Wolfram

Appl. Phys. Lett. 16, 305 (1970); http://dx.doi.org/10.1063/1.1653205 (4 pages) | Cited 15 times

Online Publication Date: 21 October 2003

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The spin‐wave spectrum of a long axially magnetized strip of noncircular cross sections is examined. The results are related to the limiting cases of the (1) ferromagnetic slab and (2) the circular cylinder. It is found that the elliptical cylinder results can be identified with the infinite‐film results of Damon and Eshbach when k, the propagation constant along the long axis of the ellipse, is identically equal to zero. This identification leads to a geometrical quantization of the wave vector in the infinite‐film calculation. For k ≠ 0 no simple quantization scheme can be used to relate the elliptical cylinder results to the infinite film results.

EFFICIENT INTERNAL OPTICAL PARAMETRIC OSCILLATION

E. O. Ammann, J. M. Yarborough, M. K. Oshman, and P. C. Montgomery

Appl. Phys. Lett. 16, 309 (1970); http://dx.doi.org/10.1063/1.1653206 (4 pages) | Cited 27 times

Online Publication Date: 21 October 2003

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Efficient internal optical parametric oscillation has been obtained using a LiNbO3 crystal inside the resonator of a continuously pumped repetitively Q‐switched 1.06μ Nd:YAG laser. Dielectric mirrors are coated directly on the plane‐parallel end faces of the crystal, and no focusing optics are used inside the laser. The oscillator operates near degenerate with outputs near 2μ. Average output powers as high as 350 mW and 75 % depletion of the available pump power are observed. This represents an order of magnitude larger output power than previously reported for a parametric oscillator. Internal oscillation causes stretching of the laser pulses to as much as five times the normal length, with corresponding increases in oscillator pulse length. Operation of this internal oscillator is compared to that of a similar external oscillator pumped by the same laser.

CAST PERMANENT MAGNETS OF THE CO5 RE TYPE WITH A (BH)M EXCEEDING 12 MILLION G‐Oe

E. A. Nesbitt, G. Y. Chin, R. C. Sherwood, and J. H. Wernick

Appl. Phys. Lett. 16, 312 (1970); http://dx.doi.org/10.1063/1.1653207 (2 pages) | Cited 5 times

Online Publication Date: 21 October 2003

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An energy product of 12.3 × 106 G‐Oe has been obtained on cast samples of a cobalt rare‐earth permanent magnet having the composition Co3.3Fe0.5Cu1.2Ce0.25Sm0.75. This exceeds the former high value of 9.8 × 106 G‐Oe obtained in an alloy of Co3.8Fe0.5Cu0.9Ce.

THE LATTICE LOCATION OF BORON IONS IMPLANTED INTO SILICON

G. Fladda, K. Björkqvist, L. Eriksson, and D. Sigurd

Appl. Phys. Lett. 16, 313 (1970); http://dx.doi.org/10.1063/1.1653208 (3 pages) | Cited 58 times

Online Publication Date: 21 October 2003

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Channeling‐effect measurements have been used to investigate the lattice location of boron atoms implanted into silicon at an energy of 56 keV and with doses in the interval 1014–1015 ions∕cm2. Measurements have been made as a function of implantation temperature and subsequent anneal treatment. The effect of post‐bombardment with different doses of 680‐keV protons has also been investigated.

NONLINEAR OPTICAL EFFECTS USING A CO2 LASER AND A KLYSTRON

V. J. Corcoran, R. E. Cupp, J. J. Gallagher, and W. T. Smith

Appl. Phys. Lett. 16, 316 (1970); http://dx.doi.org/10.1063/1.1653209 (3 pages) | Cited 14 times

Online Publication Date: 21 October 2003

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Sum and difference frequency signals have been generated and propagated by mixing CO2 laser and millimeter wave klystron outputs in a gallium arsenide loaded waveguide. As a result, coherent signals that are tunable over the tuning range of a klystron are available in the infrared region.

COHERENCE LENGTH CURVE FOR RUBY OSCILLATOR‐AMPLIFIER

L. D. Siebert

Appl. Phys. Lett. 16, 318 (1970); http://dx.doi.org/10.1063/1.1653210 (3 pages)

Online Publication Date: 21 October 2003

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The observation of maximum holographic brightness at a pathlength difference of 1.25m is reported for a ruby oscillator‐amplifier system in which the reference beam was split off the oscillator output, and the amplifier was used only in the object illumination beam. The method of obtaining the holographic coherence length curve and the explanation for the offset are discussed.

MAGNETICALLY STABILIZED CROSS‐FIELD CO2 LASER

C. J. Buczek, R. J. Wayne, P. Chenausky, and R. J. Freiberg

Appl. Phys. Lett. 16, 321 (1970); http://dx.doi.org/10.1063/1.1653211 (3 pages) | Cited 11 times

Online Publication Date: 21 October 2003

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A new concept of stabilizing an electrical CO2 laser discharge against a transverse gas flow is described. A cross magnetic field, mutually perpendicular to the discharge axial electric field and the gas flow velocity, is employed to maintain the electrical discharge column colinear with the optic axis. The cross‐field laser is convectively cooled and characterized by low flow velocities, low pressure drops, and high operating efficiencies.

TEMPERATURE DEPENDENCE OF PRODUCTION RATE OF DIVACANCY AND NEAR EDGE ABSORPTION IN Si BY FISSION NEUTRONS

L. J. Cheng and J. Lori

Appl. Phys. Lett. 16, 324 (1970); http://dx.doi.org/10.1063/1.1653212 (2 pages) | Cited 2 times

Online Publication Date: 21 October 2003

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The production rates of the 1.8‐μ absorption band and the near edge absorption in Si irradiated by fission neutrons in the temperature range from 145 to 300 °C were studied. The results indicate that for both the divacancy and the defects causing the near edge absorption, the annealing behavior during irradiation in this temperature range is the same as that after an irradiation at 50 °C.

DOUBLE‐HETEROSTRUCTURE INJECTION LASERS WITH ROOM‐TEMPERATURE THRESHOLDS AS LOW AS 2300 A∕cm2

M. B. Panish, I. Hayashi, and S. Sumski

Appl. Phys. Lett. 16, 326 (1970); http://dx.doi.org/10.1063/1.1653213 (2 pages) | Cited 46 times

Online Publication Date: 21 October 2003

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Double‐heterostructure AlxGa1−xAs☒GaAs☒ AlxGa1−xAs injection lasers with room‐temperature thresholds as low as 2300 A∕cm2 have been prepared by solution epitaxy. These lasers have high gain and a low temperature coefficient of the threshold up to the highest temperatures measured, 380 °K.
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