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1 Jun 1968

Volume 12, Issue 11, pp. 361-400


NEW PERMANENT MAGNET MATERIALS

E. A. Nesbitt, R. H. Willens, R. C. Sherwood, E. Buehler, and J. H. Wernick

Appl. Phys. Lett. 12, 361 (1968); http://dx.doi.org/10.1063/1.1651855 (2 pages) | Cited 47 times

Online Publication Date: 17 October 2003

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New permanent magnet materials containing rare‐earth elements (RE) have been discovered. For the most part, these alloys are based on the hexagonal intermetallic compounds, Co5RE. Replacement of cobalt with copper in some of these rare‐earth compounds results in solid materials with substantial permanent magnet properties. Coercive forces as high as 28,700 Oe have been obtained in heat‐treated samples of alloys in the Co5Sm☒Cu5Sm system.

IMPROVED RESOLUTION AND SIGNAL‐TO‐NOISE RATIOS IN TOTAL INTERNAL REFLECTION HOLOGRAMS

Karl A. Stetson

Appl. Phys. Lett. 12, 362 (1968); http://dx.doi.org/10.1063/1.1651856 (3 pages) | Cited 5 times

Online Publication Date: 17 October 2003

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This Letter reports improvements in resolution and signal‐to‐noise ratio for total internal reflection hologram reconstructions. It outlines the conditions employed to produce these results and indicates some of the relevant properties.

INTERNAL Q SWITCHING IN GaAs JUNCTION LASERS

J. E. Ripper and J. C. Dyment

Appl. Phys. Lett. 12, 365 (1968); http://dx.doi.org/10.1063/1.1651857 (3 pages) | Cited 8 times

Online Publication Date: 17 October 2003

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Internally Q‐switched light pulses have been obtained from junction lasers. Narrow bursts of light (<400 psec wide) were detected immediately after the termination of the injection current pulse. The effect persists for a wide variation in the length of the current pulse, from less than 2 nsec to several μsec. The internal absorption losses controlling Q switching are strongly dependent on both temperature and current. The effect is only seen in diodes with very low transition temperatures (Tt) between the regions of short and long stimulated emission delay times.

SELECTIVE ABSORPTION CHANGES IN Fe‐DOPED CdTe UNDER THE INFLUENCE OF HIGH ELECTRIC FIELDS

G. E. Fenner

Appl. Phys. Lett. 12, 367 (1968); http://dx.doi.org/10.1063/1.1651858 (2 pages)

Online Publication Date: 17 October 2003

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Experiments with Fe‐doped CdTe samples at about 15°K show that when large electric fields are applied to a crystal in the presence of mobile electrons, selective changes in the optical absorption near 4.5 μ occur. Significant increases in the absorption for wavelengths >4.38 μ and accompanying decreases in the absorption for λ < 4.38 are thought to be caused by the interaction of hot electrons with the Fe2+ ions.

LASER‐INDUCED ``BLOW‐OFF'' PHENOMENA

C. H. Skeen and C. M. York

Appl. Phys. Lett. 12, 369 (1968); http://dx.doi.org/10.1063/1.1651859 (3 pages) | Cited 20 times

Online Publication Date: 17 October 2003

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A high‐power, Q‐switched, neodymium‐doped glass laser was used to create a blow‐off plasma at surfaces of solid materials. Measurements of the ensuing stress pulses and the associated phenomena are discussed.

USE OF NEON AS A NONLINEAR ABSORBER FOR MODE LOCKING A He☒Ne LASER

A. G. Fox, S. E. Schwarz, and P. W. Smith

Appl. Phys. Lett. 12, 371 (1968); http://dx.doi.org/10.1063/1.1651860 (3 pages) | Cited 27 times

Online Publication Date: 17 October 2003

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We find that a tube of pure Ne20, excited by a discharge and placed within the cavity of a He3☒Ne20 laser operating at 6328 Å can cause a stable, continuous train of short optical pulses to be produced.

FAST PHOTOCONDUCTIVITY OF TELLURIUM BY CO2 LASER RADIATION

Noboru Miura and Shoji Tanaka

Appl. Phys. Lett. 12, 374 (1968); http://dx.doi.org/10.1063/1.1651861 (2 pages) | Cited 12 times

Online Publication Date: 17 October 2003

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Very fast photoconductivity was observed in tellurium single crystals which were excited by a CO2 laser. The photoconductivity follows completely the Q‐switched laser pulses, and the carrier lifetime is estimated to be of the order of 10−12 sec.

CW PARAMETRIC SCATTERING IN ADP WITH STRONG ABSORPTION IN THE IDLER BAND

T. G. Giallorenzi and C. L. Tang

Appl. Phys. Lett. 12, 376 (1968); http://dx.doi.org/10.1063/1.1651862 (3 pages) | Cited 9 times

Online Publication Date: 17 October 2003

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Results on the signal intensity and collinear tuning characteristics in CW optical parametric scattering in ADP pumped at 4880 Å are presented and discussed. The corresponding idler wave is in a strong absorption region of ADP.

PARAMETRIC AMPLIFICATION OF ULTRASONIC WAVES IN CdS

S. Zemon, J. Zucker, J. H. Wasko, E. M. Conwell, and A. K. Ganguly

Appl. Phys. Lett. 12, 378 (1968); http://dx.doi.org/10.1063/1.1651863 (3 pages) | Cited 31 times

Online Publication Date: 17 October 2003

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Traveling‐wave parametric amplification of 0.5‐GHz acoustic shear waves has been observed in CdS at room temperature. Acoustoelectric coupling provides the nonlinear interaction. Observed gain was about 10 dB∕mm, which is comparable to that of the conventional acoustic amplifier.

Q SWITCHING AND MODE LOCKING OF A CF3I PHOTOLYSIS LASER

C. M. Ferrar

Appl. Phys. Lett. 12, 381 (1968); http://dx.doi.org/10.1063/1.1651864 (3 pages) | Cited 13 times

Online Publication Date: 17 October 2003

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Peak power in excess of 1 MW, at 1.315‐μ wavelength, has been obtained by Q switching a small gaseous CF3I photolysis laser operating in a single axial cavity mode. When several axial modes oscillate, mode locking produces periodic pulsing of the Q‐switched output with somewhat enhanced peak power.

ANODIC‐BORE ION LASER TUBE

William H. McMahan

Appl. Phys. Lett. 12, 383 (1968); http://dx.doi.org/10.1063/1.1651865 (3 pages) | Cited 2 times

Online Publication Date: 17 October 2003

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Ion laser plasma tubes have been designed and tested in which the major cause of deterioration is eliminated and laser efficiency is improved. Ion bombardment of the walls of the discharge bore is eliminated by electrical means. The walls of the discharge bore are maintained at a positive potential with respect to the laser plasma.

RADIATION EFFECTS AND ELECTRICAL STABILITY OF METAL‐NITRIDE‐OXIDE‐SILICON STRUCTURES

C. W. Perkins, K. G. Aubuchon, and H. G. Dill

Appl. Phys. Lett. 12, 385 (1968); http://dx.doi.org/10.1063/1.1651866 (3 pages) | Cited 2 times

Online Publication Date: 17 October 2003

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Radiation‐induced threshold voltage shifts in MNOS structures are measured as a function of oxide layer thickness. The shifts for negative biases vanish at an oxide thickness near 125 Å and remain negligible for positive biases at this thickness. Electrical stability for this thickness is maintained for gate voltages from −40 to +35 V.

SELF‐Q‐SWITCHING IN RUBY LASERS

Isaac Freund

Appl. Phys. Lett. 12, 388 (1968); http://dx.doi.org/10.1063/1.1651867 (3 pages) | Cited 9 times

Online Publication Date: 17 October 2003

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A laser consisting solely of a pumped ruby rod and rear reflector has been operated so as to produce single giant pulses.

UNDAMPED REGULAR SPIKING OF A RUBY LASER IN A MISALIGNED CAVITY

R. C. Greenhow and A. J. Schmidt

Appl. Phys. Lett. 12, 390 (1968); http://dx.doi.org/10.1063/1.1651868 (2 pages) | Cited 3 times

Online Publication Date: 17 October 2003

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Regular spiking of a ruby laser has been observed in a cavity with two plane mirrors, one of which was tilted. With the introduction of a lens the regularity and reproducibility of the regular spiking was improved considerably.

A NEW METHOD OF GIANT PULSING RUBY LASERS

R. J. Collins, L. O. Braun, and D. R. Dean

Appl. Phys. Lett. 12, 392 (1968); http://dx.doi.org/10.1063/1.1651869 (2 pages) | Cited 6 times

Online Publication Date: 17 October 2003

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Giant pulses have been obtained from a ruby laser by a new technique. This technique provides control of the output pulses by the static misalignment of the cavity. No additional cavity elements were required for the production of giant pulses. Relative enhancement in the peak power by misalignment has been studied as a function of two cavity parameters.

ELECTRONIC SIMULATION OF A VARIABLE INCLINATION REFERENCE FOR ACOUSTIC HOLOGRAPHY VIA THE ULTRASONIC CAMERA

R. K. Mueller, E. Marom, and D. Fritzler

Appl. Phys. Lett. 12, 394 (1968); http://dx.doi.org/10.1063/1.1651870 (2 pages) | Cited 7 times

Online Publication Date: 17 October 2003

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Images have been optically reconstructed from acoustic holograms obtained by electronic scanning of a piezoelectric crystal receiver and an electronic signal simulating an artificial reference plane wave. An inclined acoustic reference wave whose angle of incidence could be varied was synthesized electronically.

SPUTTERING OF OXIDE FILMS IN PLASMA ANODIZATION OF ALUMINUM

L. D. Locker and L. P. Skolnick

Appl. Phys. Lett. 12, 396 (1968); http://dx.doi.org/10.1063/1.1651871 (2 pages) | Cited 5 times

Online Publication Date: 17 October 2003

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Oxide films on aluminum can be sputtered off in oxygen or in argon glow discharges, when a positive bias is applied to the specimen. It is shown that this phenomenon limits the thickness of films that can be grown by plasma anodization. The sputtering does not necessarily require negative ions, since these are absent in the argon discharge.

THERMALLY STIMULATED CURRENTS AND LUMINESCENCE IN RUTILE (TiO2)

R. R. Addiss, Amal K. Ghosh, and F. G. Wakim

Appl. Phys. Lett. 12, 397 (1968); http://dx.doi.org/10.1063/1.1651872 (4 pages) | Cited 20 times

Online Publication Date: 17 October 2003

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A weak luminescence emission band at 850 mμ was found in rutile cyrstals, and a series of shallow electron traps (<1 eV) were detected in thermally stimulated current and thermoluminescence curves, both of which show the same eight peaks in the temperature range of −190 to +100°C. These results are characteristic of all samples examined, including crystals from two different sources, crystals having different orientations, and crystals having different amounts of reduction within a limited range.
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