摘要:

The radial pattern of an ion sound wave in a mercury discharge tube where the ion sound wave is parametrically excited in Tonks‐Dattner resonance is observed. The frequency of the HF (high‐frequency) wave is chosen to be about one order lower than that in Stern's experiment so that the diameter of the tube can be large, by which means the detailed radial pattern of the wave can be obtained. The result qualitatively agrees with the theory predicted by Rosa and Allen‐that is, it does not show the standing‐wave pattern.

ISSN:0003-6951    

DOI:10.1063/1.1654345

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

We report light‐wave propagation experiments in single‐crystal epitaxially grown garnet films. The discussion includes refractive index and lattice constant considerations for various garnets, and also the use of iron garnet films on gallium garnet substrates as magneto‐optical waveguides useful in integrated optics.

ISSN:0003-6951    

DOI:10.1063/1.1654346

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Preliminary experiments suggesting the feasibility of using a resonance fluorescence scheme to detect ambient concentrations of OH in the atmosphere (106molecules/cm3) were carried out using OH concentrations near 1012molecules/cm3. TheP1(1)line of thev= 0 → 1 branch of the lowest electronic transition of OH at 2822 Å was resonantly excited with radiation from a doubled dye laser. The subsequent fluorescence from thev= 0 → 0 branch with &Dgr;&ngr; ≅ 3050 cm−1was observed to have a fluorescence efficiency of 0.6 × 10−3in N2at atmospheric pressure with a 10‐mm partial pressure of H2O. This fluorescence occurs 500 cm−1away from any strong Raman line in the atmosphere.

ISSN:0003-6951    

DOI:10.1063/1.1654347

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

It is shown that the well‐known piezomagnetic tensor can be used to determine those experimental configurations in which the electro‐optical activity can be separated from birefringence, optical activity, and linear electro‐optical effect.

ISSN:0003-6951    

DOI:10.1063/1.1654348

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Forced convective flow has been applied to a CO laser, resulting in an order‐of‐magnitude enhancement of the output power density over what can be achieved from the same laser under diffusion‐dominated operation. A 1‐m‐long 2.5‐cm‐diam‐bore laser has produced 400 W of cw emission at 20% electrical efficiency.

ISSN:0003-6951    

DOI:10.1063/1.1654349

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Glass optical waveguides show great promise of being the transmission medium for optical communication links. Single‐mode waveguides have already been reported having a total attenuation of less than 20 dB/km. In this work we report measurements on the first low‐loss multimode glass waveguide. These measurements include both total attenuation as a function of wavelength and total radiation attenuation at 632.8 nm. Total attenuation as low as 7 dB/km was observed near 1060 nm. This is due in part to fabrication techniques which diminished the OH concentration in the glass. A total radiation loss of 12.3 dB/km was measured that is higher than that predicted solely by Rayleigh scattering.

ISSN:0003-6951    

DOI:10.1063/1.1654350

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

The effect of high magnetic fields upon the heating rate of CO2‐laser‐produced plasmas has been calculated. It is found that the inhibition of thermal losses in the presence of high magnetic fields should substantially enhance the effectiveness of the CO2laser as a means of creating hot plasmas. Electron and ion temperatures are computed for plasmas produced with 1010‐W CO2lasers.

ISSN:0003-6951    

DOI:10.1063/1.1654351

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

The room‐temperature pyroelectric coefficient of Tl3AsSe3, a hexagonal nonferroelectric crystal, is 0.35 &mgr;C/cm2°K, one of the largest observed to date. This large pyroelectric coefficient and the measured electrical properties make this material attractive for pyroelectric detector applications.

ISSN:0003-6951    

DOI:10.1063/1.1654352

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A mechano‐optic polarization modulator is described which uses a diffraction grating from which incidents‐polarized (perpendicular to the plane of incidence) light is obliquely reflected. Rotation of the grating around its normal causes optical rotation of the plane of polarization of the reflected light. The ellipticity and amplitude modulation which accompany this azimuth modulation are insignificant. The modulation is linear up to a limit determined by the onset of a surface‐plasmon‐excitation anomaly. A 610‐lines/mm diffraction grating is used to linearly modulate a 6328‐Å He&sngbnd;Ne laser with a modulation index of 0.183° of optical rotation per degree of mechanical rotation. This modulation effect is useful in instruments that use polarization‐modulated light and ac phase detection. It also provides a method for optical measurement of torsional oscillations.

ISSN:0003-6951    

DOI:10.1063/1.1654353

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A molecular kinetic model and self‐consistent oscillator analysis have been developed for electrically excited transient and steady‐state (CO, N2, He, Ar, …) laser systems. Theoretical calculations for a transient oscillator are compared with experimental data obtained from a high‐pressure electron‐beam‐stabilized long‐pulse transverse‐discharge CO device.

ISSN:0003-6951    

DOI:10.1063/1.1654354

出版商:AIP    

年代:1972

数据来源: AIP