摘要:

A quasi‐continuous KrF(B→X) fluorescence of >8 ms pulse duration with 100 Hz operation frequency was observed in a microwave discharge‐pumped KrF lamp. The average KrF fluorescence power was 53 W, obtained with an intrinsic efficiency of 8.3% with a 678 W average microwave power deposition. We also obtained a peak KrF fluorescence power of 120 W with a power efficiency of 12.1%.

ISSN:0003-6951    

DOI:10.1063/1.101039

出版商:AIP    

年代:1989

数据来源: AIP

摘要:

A tandem photoconductive switch, producing nearly rectangular electrical pulses with variable duration from 25 ps to 1 ns, was used for accurate turn‐on delay measurements of a laser diode. Maximum electrical pulse amplitude was 75 V and both rise and fall times were 15 ps. The shortest delay recorded was 60 ps. The carrier lifetime at the lasing threshold was found to be 3.89 ns.

ISSN:0003-6951    

DOI:10.1063/1.101040

出版商:AIP    

年代:1989

数据来源: AIP

摘要:

Self‐pumped phase conjugation is observed using a KNbO3crystal. The reflectivity of an external ring phase conjugate mirror is measured as a function of temperature for 515 nm radiation. The maximum reflectivity is 26% at 124 °C. On cooling, the reflectivity decreases and vanishes completely below 62 °C. The phase conjugate nature of the retroreflected beam is illustrated. The temperature‐dependent response time is shown to be proportional to (T−56 °C)−1.

ISSN:0003-6951    

DOI:10.1063/1.101545

出版商:AIP    

年代:1989

数据来源: AIP

摘要:

We report the first electro‐optic depolarization (TE guided mode to TM substrate modes) switch ony‐cut LiNbO3proton‐exchanged channel waveguides operating at 632.8 nm. Tunability of the waveguide ordinary and extraordinary indices through thermal annealing provides an alternative way to reduce the drive voltage. An extinction ratio of 13.5 dB is achieved with 10 V applied voltage on a switch with 4 &mgr;m channel width and 3 mm electrode length. The measured capacitance of the electrode is 4.2 pF, which gives a theoretical modulation bandwidth of 1.5 GHz in a 50 &OHgr; lumped electrode structure.

ISSN:0003-6951    

DOI:10.1063/1.101546

出版商:AIP    

年代:1989

数据来源: AIP

摘要:

The design of a simple all‐optical spatial scanner, based on a propagating self‐focused channel incident at an oblique angle to a nonlinear dielectric interface, is illustrated using the beam propagation method. The channel asymptotics are shown to be insensitive to the shape of the incident beam profile with the latter satisfying a simple area criterion.

ISSN:0003-6951    

DOI:10.1063/1.101041

出版商:AIP    

年代:1989

数据来源: AIP

摘要:

A row of six surface‐emitting GaAlAs laser diode arrays was locked in a coupled resonator configuration by means of interconnecting waveguides. An external master oscillator was injected into the first array in order to achieve single longitudinal mode operation and wavelength tunability. Spectral data show all six devices were locked in a single longitudinal mode, with tunable operation of over 60 A˚. Far‐field fringe visibilities greater than 60% were achieved at 100 mW output powers.

ISSN:0003-6951    

DOI:10.1063/1.101042

出版商:AIP    

年代:1989

数据来源: AIP

摘要:

An incoherent, two‐dimensional array of high‐power lasers operating at &lgr;=0.95 &mgr;m is demonstrated. The laser structure consists of a single 70 A˚ strained In0.2Ga0.8As quantum well active region with an AlGaAs graded‐index separate confinement heterostructure, prepared by atmospheric pressure organometallic vapor phase epitaxy. The rack‐and‐stack array contains 536 oxide‐stripe emitter elements in a 1.7 mm×1 cm area, producing approximately 200 Watts at a 60 A drive current. Under pulsed operation the external differential quantum efficiency is 40% while the power conversion efficiency reaches 16%. At high power, greater than 90% of the individual elements are lasing, with an overall spectral width &Dgr;&lgr;∼5 mm.

ISSN:0003-6951    

DOI:10.1063/1.101020

出版商:AIP    

年代:1989

数据来源: AIP

摘要:

A new type of plasma cathode for x‐ray and electron beam generation has been demonstrated using a formed ferrite plasma source where a durable filament on the ferrite rod creates a large area of plasma surface as the electron source. Measured anode voltage‐current relationships show the space‐charge‐limited operation with a high current density of 17 A/cm2at 70 kV anode voltage during 2.5 &mgr;s. This source is promising for high repetition rate operation with a long life.

ISSN:0003-6951    

DOI:10.1063/1.101021

出版商:AIP    

年代:1989

数据来源: AIP

摘要:

A compactEparallelB(E∥B) type end‐loss ion mass‐resolving energy analyzer was fabricated and tested. In the analyzer, a small‐angle deflection magnet and a preaccelerator/decelerator of end‐loss ions are adopted in order to reduce the size and to expand an energy range with a sufficient energy resolution. Orbit calculations in theE∥Bfields including the influence of fringe fields were made by a Monte Carlo code in which the effects of finite radius and angle of the incident ions are taken into consideration. Preliminary measurements on the GAMMA 10 tandem mirror were successfully performed and it was confirmed that the analyzer has capabilities for the spectrometer of end‐loss ions.

ISSN:0003-6951    

DOI:10.1063/1.101022

出版商:AIP    

年代:1989

数据来源: AIP

摘要:

Thin films have been deposited in a ‘‘dual frequency mode’’ plasma, in which differing amounts of radio frequency (rf, 13.56 MHz) power were applied to the substrate, while sustaining the plasma with constant microwave (2.45 GHz) power. We report results pertaining to deposition of silicon oxide and organosilicon thin films. The rf‐induced negative dc self‐bias voltage is shown to affect plasma‐chemical reactions, causing very significant changes in the deposition rate, film composition, and dielectric properties of the resulting materials. This provides a powerful new technique for producing ‘‘tailored’’ films, while preserving the important advantages of high deposition rates and low substrate temperatures.

ISSN:0003-6951    

DOI:10.1063/1.101566

出版商:AIP    

年代:1989

数据来源: AIP