摘要:

Operation of the first supersonic combustor‐driven purely chemical CO laser is reported. The combustor is fueled with NF3‐CH4‐H2‐CS2and produces a mixture of HF, N2, CS, CS2, and S which is mixed with dry air and N2O during a supersonic expansion into the laser cavity. A chain reaction involving CS and O2is initiated by the S atoms and produces CO with a non‐Boltzmann vibrational‐rotational energy‐level population distribution. The laser produces 450 W of closed‐cavity power as determined by mirror calorimetry.

ISSN:0003-6951    

DOI:10.1063/1.90344

出版商:AIP    

年代:1978

数据来源: AIP

摘要:

It is shown that backward‐wave photon echoes may be generated and the echo wave fronts are time reversed with respect to the first pulse of either a two‐ or three‐pulse input sequence. Some comparisons are made with the four‐wave degenerate parametric technique for generating time‐reversed wave fronts.

ISSN:0003-6951    

DOI:10.1063/1.90345

出版商:AIP    

年代:1978

数据来源: AIP

摘要:

An MIS solar cell, consisting of beryllium onp‐type silicon with an interfacial oxide layer, has been found to have good conversion efficiency and good reproducibility. Sunlight conversion efficiency appeared to be more than 9% without the use of an antireflection coating.

ISSN:0003-6951    

DOI:10.1063/1.90346

出版商:AIP    

年代:1978

数据来源: AIP

摘要:

Two‐photon resonance‐enhanced third harmonic generation of CO2laser radiation has been studied in DCl. The measurements of the phase‐matched third harmonic signal in a DCl‐CF4mixture of 1 : 0.010 up to 5 atm show that the third‐order susceptibility for DCl gas is substantially larger than that for the CO gas.

ISSN:0003-6951    

DOI:10.1063/1.90347

出版商:AIP    

年代:1978

数据来源: AIP

摘要:

Tunable narrow‐band Lyman‐alpha radiation (∼1216 A˚) has been generated by frequency tripling in krypton. A near‐diffraction‐limited tunable 15‐nsec 10‐MW input at 3648 A˚ was used to generate ∼3.6×1011photons (60 W) per pulse at 1216 A˚. Measurements of the output as a function of gas pressure give the refractive index for krypton at 1216 A˚, demonstrating its negatively dispersive character.

ISSN:0003-6951    

DOI:10.1063/1.90348

出版商:AIP    

年代:1978

数据来源: AIP

摘要:

Thin‐film Luneburg lenses are formed by sputtering through a circular shaped mask. A series of computer simulation programs have been developed for the synthesis of the shadow mask contour to produce the necessary thin‐film lens thickness profile. Diffraction‐limited results have been obtained for guided wave optical lenses.

ISSN:0003-6951    

DOI:10.1063/1.90349

出版商:AIP    

年代:1978

数据来源: AIP

摘要:

A laser made of a 1‐cm‐long Nd0.75La0.25P5O14crystal with bonded mirrors has been side pumped with two arrays of light‐emitting Al0.1Ga0.9As planar diodes in a double cylindrical‐elliptical cavity. Pulsed operation (0.6 ms) is obtained at −13.5 °C, and cw lasing at −49 °C, with LED current densities of 700 and 270 A cm−2, respectively.

ISSN:0003-6951    

DOI:10.1063/1.90350

出版商:AIP    

年代:1978

数据来源: AIP

摘要:

The reversible change in photoluminescence intensity with change in gaseous ambients (N2, Ar, H2, O2, H2O, and vacuum) from a InP cleaved (110) surface and the irreversible change in photoluminescence from a GaAs cleaved (110) surface when exposed to oxygen were observed at room temperature. These phenomena imply that adsorbed N2, H2, Ar, H2O, and O2gases can be exchanged reversibly on the InP surface, and the surface recombination velocity changes reversibly with the adsorbed gas species. On the other hand, oxidation proceeds rapidly and irreversibly on GaAs cleaved surfaces.

ISSN:0003-6951    

DOI:10.1063/1.90351

出版商:AIP    

年代:1978

数据来源: AIP

摘要:

A two‐phase supercooled solution method is described for the LPE growth of In1−xGaxAsyP1−yon ⟨100⟩ InP over the entire range of lattice‐matched compositions, 0⩾y<1, 0?x<0.47. Liquid and solid compositions, distribution coefficients, and band‐gap data which may be used to design specific devices are presented.

ISSN:0003-6951    

DOI:10.1063/1.90352

出版商:AIP    

年代:1978

数据来源: AIP

摘要:

Insulating carbon films were developed to prevent facet deterioration of (AlGa)As DH lasers. Chemically durable optically transparent carbon film was obtained by a carbon ion‐beam deposition technique. Stable lasing operations have been obtained with carbon coated lasers for over 6000 h.

ISSN:0003-6951    

DOI:10.1063/1.90353

出版商:AIP    

年代:1978

数据来源: AIP