摘要:

Anomalously large laser penetration depths in multilayer planar targets have been observed. Density dependence of the penetration depth also showed significant deviations from the theoretical scaling for laser‐driven ablation. A simple model was proposed in which the ablation process was modified by an edge effect due to the small focal spot.

ISSN:0003-6951    

DOI:10.1063/1.94919

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Dispersive optical hysteresis in an all optical passive unidirectional ring cavity containing a molecular gas has been observed. Ammonia is used as the nonlinear medium off resonantly excited on theaR(1,1) transition using temporally smooth 100‐ns pulses from a transversely, excited, atmospheric pressure CO2laser. Results are in excellent agreement with the theory of Ikeda recently generalized by the authors to describe period doubling in this system.

ISSN:0003-6951    

DOI:10.1063/1.94920

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

We demonstrate the operation of an optically synchronized streak camera operating at 10‐Hz repetition rate and has a system jitter of less than 2 ps. Synchronization is achieved with an iron‐doped indium phosphide photoconductive switch which allows for room‐temperature dc biasing. Femtosecond laser pulses are used for measuring the time response of the streak camera.

ISSN:0003-6951    

DOI:10.1063/1.94921

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

The complex dynamical resistivity of high‐quality transparent and heat‐reflecting indium tin oxide films, prepared by reactivee‐beam deposition, was evaluated from spectrophotometric measurements in the 0.25–50‐&mgr;m wavelength range. These data are explained in detail from a theory encompassing scattering of free electrons by ionized impurities.

ISSN:0003-6951    

DOI:10.1063/1.94896

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

This letter presents a method for the analysis of stiff density fields in which weak density gradients as well as strong ones, pointing in different directions, exist. Holographic techniques are used to freeze the deviated rays of a collimated beam traveling through a phase object. The hologram is post analyzed by the ‘‘moire deflectometry’’ method, where the sensitivity, the spatial resolution, and the direction along which the density gradients are measured, may easily be changed and adjusted to the different density regions in the field. It was found that this technique is very useful for short duration stiff fields where density mapping during one pulse is desired.

ISSN:0003-6951    

DOI:10.1063/1.94922

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

A 37‐W cw CO2laser operating on theR(30) 9‐&mgr;m transition is used to pump a linear waveguide cavity containing NH3. Raman emission at 12.08 &mgr;m is observed with a cw output power of 10.2 W. This performance represents a photon conversion efficiency of >40%, the highest yet reported for a cw optically pumped infrared laser.

ISSN:0003-6951    

DOI:10.1063/1.94923

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Passive phase conjugation of up to six lines (457, 476, 488, 496, 501, and 514 nm) of the all lines output of an argon ion laser is reported. Imaging characteristics and reflectivity measurements are given. In general, multiline operation results in some loss in both reflectivity and image resolution. This work opens the possibility for passive phase conjugation of full color images.

ISSN:0003-6951    

DOI:10.1063/1.94924

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Single‐stage compression factors as high as 80× have been demonstrated for the 0.532‐&mgr;m optical pulses of a frequency doubled Nd:yttrium aluminum garnet laser using a single‐mode fiber and a modified grating‐pair delay line. Input optical pulses of 33‐ps duration have been compressed to 0.41‐ps duration. This represents the largest single‐stage compression factor reported to date. Subpicosecond optical pulses can be obtained directly from relatively long optical pulses without the use of a mode‐locked dye laser.

ISSN:0003-6951    

DOI:10.1063/1.94897

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

In this letter the carrier dependence of the radiative bimolecular coefficients obtained from differential carrier lifetime measurements is reported. The bimolecular coefficientB(n) decreases significantly with carrier density. It is found thatB(n) is well approximated byB(n)&bartil;B0−B1n, withB1/B0=(1.1±0.2)×10−19cm3for GaAlAs and (1.6±0.2)×10−19cm3for 1.3 &mgr;m InGaAsP. This effect has a strong influence on the spontaneous emission efficiency in both InGaAsP and GaAlAs light sources.

ISSN:0003-6951    

DOI:10.1063/1.94898

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Differential voltage‐current characteristics of coupled cavity semiconductor lasers are studied experimentally. Lasing thresholds of individual cavities, regions of single mode or multimode oscillation, or mode hop locations are easily obtained from the analysis. The optoelectronic properties can be used for monitoring operating states of the lasing system without requiring external optical elements.

ISSN:0003-6951    

DOI:10.1063/1.94899

出版商:AIP    

年代:1984

数据来源: AIP