摘要:

Deep levels arising from inadvertent defect centers have been studied in both liquid‐encapsulated‐Czochralski (LEC) and liquid‐phase‐epitaxial (LPE)n‐type GaP by using Schottky barrier photocapacitance. In LEC material the total concentration of deep levels in the upper half of the band gap is determined to be about 5×1016cm−3; in LPE material, about 5×1014cm−3. In the lower half of the band gap, optical emission of majority carriers and thermal emission of minority carriers are observed from two distinct levels at 0.4 and 0.1 eV above the valence band edge. These levels are found to have similar concentrations of about 1×1016cm−3in both LPE and LEC material.

ISSN:0003-6951    

DOI:10.1063/1.1654549

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Continuously tunable cw diode lasers that produce narrow‐line (1‐ to 10‐MHz linewidth) radiation in the 3.5‐&mgr;m region have been fabricated from Pb0.98Cd0.02S. Lasers operating at 10–20 K produced more than 1 mW of cw power distributed among several modes which could be tuned continuously > 1 cm−1by adjusting the laser current. A spectral range of 30 cm−1could be covered over the full operating range. Ultrahigh‐resolution (10−5cm−1) spectra of H2CO have been obtained to demonstrate the potential application of these lasers to the identification of organic molecules by spectroscopy of their C&sngbnd;H stretch absorption bands.

ISSN:0003-6951    

DOI:10.1063/1.1654550

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Measurements of the chirp of individual TEA CO2laser pulses are reported. Rates of chirping during the peak and the tail are attributed to two different mechanisms. Spectrum analyzer results corroborate the time‐resolved measurements.

ISSN:0003-6951    

DOI:10.1063/1.1654551

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Hard bubbles in typical bubble garnets can be eliminated by ion implantation which produces a layer of planar magnetization at least a few hundred angstroms thick. Neon at doses in the 1014‐ions/cm2range is as effective as hydrogen at doses in the 1016‐ions/cm2range in suppressing hard bubbles without effecting domain wall coercivity or mobility. Annealing studies have shown that the thermal stability of the effect increases with increasing dose and decreasing energy of implantation and is sufficient to withstand maximum device processing temperatures and assure long lifetimes.

ISSN:0003-6951    

DOI:10.1063/1.1654552

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Magnetic domains of a press‐sintered SmCo5magnet with a high intrinsic coercivity (IHc= 12 700 Oe) and energy product [(BH)max= 18.0 MGOe] were observed in the demagnetized state by the powder pattern technique. The domains on the surfaces parallel and perpendicular to the alignment direction and at grain boundaries are shown in detail. The domain structures observed are of the same type as those for thick crystals with high uniaxial anisotropy, such as MnBi and BaFe12O19.

ISSN:0003-6951    

DOI:10.1063/1.1654553

出版商:AIP    

年代:1973

数据来源: AIP

ISSN:0003-6951    

DOI:10.1063/1.1654554

出版商:AIP    

年代:1973

数据来源: AIP