摘要:

Interaction of guided optical waves with microwave magnetostatic waves in yittrium iron garnet thin films has been demonstrated. TM↔TE mode conversion induced by codirectional (and contradirectional) magnetostatic waves was experimentally observed with conversion efficiencies of up to 4%. Theoretical expressions for this interaction are given and compared with observations. The thin‐film geometry demonstrated could make a practical number of optical signal processing devices in the 1–20‐GHz range.

ISSN:0003-6951    

DOI:10.1063/1.93700

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Gradient‐index antireflecting surfaces produced by neutral solution processing have a median surface damage threshold of 12 J/cm2for 1‐ns, 1064‐nm pulses. We have found that the threshold can be increased to 25 J/cm2by irradiating the surface with 1064‐nm wavelength pulses with fluence below the initial 12‐J/cm2threshold. Damage thresholds, both before and after this treatment, increased as the square root of the pulse duration in the 1–20‐ns range.

ISSN:0003-6951    

DOI:10.1063/1.93701

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

The existence of two sources of the photionization in UV preionized sealed CO2‐N2‐He‐(CO) lasers has been established. One is steadily created in the laser gas mixture by the electrical discharge and is identified as NO and NO2. The second source is associated with an impurity in any CO gas used as part of the initial gas mixture.

ISSN:0003-6951    

DOI:10.1063/1.93702

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

We report the first experimental observation of bound‐continuum fluorescence in the mercuric bromide system. HgBr (B2&Sgr;+) population is created in ultraviolet photodissociative excitation of the dihalide. The resulting bound‐free fluorescence (B2&Sgr;+→A2&Pgr;) is detected over a bandwidth of &bartil;120 nm centered at 685 nm. The associated and well known bound‐bound fluorescence (B2&Sgr;+→X 2&Sgr;+) is also seen. A semiclassical computer code has been developed to predict the transition probability density for the observed bound‐free features.

ISSN:0003-6951    

DOI:10.1063/1.93703

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

TheB → Xspectra of HgCl and HgI are studied at high resolution for the single isotopic species,200Hg35Cl,200Hg127I, and200Hg129I. For HgI the analysis indicates that thev″ numbering should be decreased by one unit from the previous assignment. For both molecules the analyses deviate progressively from the previous assignments at highv″, extrapolating to lower estimates of the ground‐state dissociation energies. Franck–Condon calculations yield &Dgr;Re(=Re′ −Re″) =0.60A˚ for HgCl and 0.49 A˚ for HgI. The strongest laser features previously reported for HgCl occur near the heads of the overlapped 0–22, 1–23, 2–24, and 3–25 bands. The HgI laser operates in the region of the 0–14, 0–15, 1–15, 1–16, 2–17, and 2–18 bands.

ISSN:0003-6951    

DOI:10.1063/1.93704

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Low threshold InGaAsP/InP injection lasers on semi‐insulating InP substrates have been developed with mirrors fabricated by the microcleavage technique. Miniature suspended bridges containing the laser channels have been formed and then microcleavage has been accomplished by the use of ultrasonic vibrations. Lasers with current thresholds as low as 18 mA with 140‐&mgr;m cavity length and with 35–45% differential quantum efficiency have been obtained.

ISSN:0003-6951    

DOI:10.1063/1.93705

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Two hundred megahertz electrodeless rf discharge excitation of an XeF laser is reported. Laser output of total duration exceeding 300 ns is observed. Onset of discharge inhomogeneity is found to limit duration of the laser pulse and to influence recovery of the active medium.

ISSN:0003-6951    

DOI:10.1063/1.93706

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Room‐temperature cw operation at the wavelength below 700 nm has been achieved by AlGaAs double heterojunction (DH) lasers with a novel structure, in which a thick buffer layer is grown and the substrate is removed. Continuous‐wave threshold currents were 60–120 mA in the visible spectral range of 680–700 nm. Also the fundamental transverse and single longitudinal mode were obtained under cw operation. The shortest cw wavelength is 683 nm at the present time.

ISSN:0003-6951    

DOI:10.1063/1.93691

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

A UV‐preionized rare‐gas halide laser with a large aperture to 7×7 cm2and active volume of 4lhas been operated at a high pressure regime of 5 atm. Beam profile measurements at the midplane between electrodes have shown the beam widths of 7 cm at a half‐energy density both in KrF and XeCl. The improvement in discharge homogeneity and extension of the optical pulse duration have been obtained by the peaking of the discharge current with a small stray capacitance between the rail gap and the laser head as well as by the use of Ne rather than He as a buffer gas, resulting in the output energy of 13.8 J in XeCl and 5.0 J in KrF.

ISSN:0003-6951    

DOI:10.1063/1.93692

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Low loss plastic optical fibers (POF’s) have been prepared employing poly(methyl methacrylate‐d5) [P(MMA‐d5)] core and fluorinated alkyl methacrylate copolymer cladding with attenuation losses of 41 and 55 db/km at wavelengths of 565 and 646 nm, respectively. The POF can allow short distance optical signal transmission, about 400 m at –36 dBm at rates up to 25 MHz, using a display grade GaAlAs light emission diode whose emission power at 660 nm and 20 mA of forward input current is 1 mW. The loss limit of this P(MMA‐d5) core POF is estimated to be 22 dB/km at 565 nm.

ISSN:0003-6951    

DOI:10.1063/1.93693

出版商:AIP    

年代:1982

数据来源: AIP