摘要:

Intense superradiant emission has been observed from methyl fluoride excited by 0.6‐MW pulses from a high‐pressure CO2laser. Pulses of ∼ 1 kW with a duration of ∼ 150 nsec have been obtained from a 5‐m‐long 40‐mm‐diam cell containing 0.7 Torr of methyl fluoride. This output represents an efficiency of converting infrared photons to far‐infrared photons of ∼ 5%. Evidence for partial waveguiding in the cell and for phase‐coherent amplification are presented.

ISSN:0003-6951    

DOI:10.1063/1.1654539

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Glass thin‐film optical branching waveguides have been fabricated by sputtering. It is found that the dielectric branch has functions of mode filtering and mode conversion. The concept of dielectric branch offers many possibilities to integrated optical circuitry.

ISSN:0003-6951    

DOI:10.1063/1.1654540

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Charge‐coupled devices with silicon‐nitride‐silicon‐oxide composite gate dielectric layers have been shown to exhibit electrically alterable static memory. The storage of charge und under a specific gate by combined charge transfer and tunneling into memory states and the detection of its presence at a later time have been demonstrated.

ISSN:0003-6951    

DOI:10.1063/1.1654541

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

The peak small‐signal gain and output energy of an electrically initiated chemical laser are measured for both HF and DF operation. For identical conditions of electrical discharge and gas mixture [SF6&sngbnd;H2(D2)&sngbnd;He], the DF laser small‐signal gain coefficient is about a factor of 2 below that for HF, while in the oscillator configuration the output energies for the two cases are equal. The gain threshold is determined for parasitic oscillations, which can be avoided only under medium conditions corresponding to relatively low output energy. The maximum parasitic‐free energy with DF is about ten times that with HF.

ISSN:0003-6951    

DOI:10.1063/1.1654542

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Pulsed and continuous laser operation of the Ho3+ 5I7→5I8transition at 2.1 &mgr;m has been obtained at 77°K by using Y1.25Ho0.1Er0.55Tm0.5Yb0.6Al5O12thin films grown on Y3Al5O12substrates. Oscillation at the 1.06‐&mgr;m4F3/2→4I11/2transition of Nd3+has also been observed at 77 and 300°K from Y3Al5O12:Nd3+films. The characteristics of these thin‐film waveguide lasers are discussed.

ISSN:0003-6951    

DOI:10.1063/1.1654543

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Electromagnetic radiation in the far‐infrared region of the spectrum was produced by the interaction between a relativistic electron beam and a spatially modulated magnetic field. Power of the order of megawatts was observed at wavelengths greater than about 50 &mgr;. The radiation does not originate from a simple synchrotron mechanism, and one has to invoke other processes.

ISSN:0003-6951    

DOI:10.1063/1.1654544

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

A supersonic mixing nozzle for CO2gas‐dynamic lasers is presented. It is shown that satisfactory mixing can be obtained with an increase of the freeze efficiency over simple expansion nozzles for premixed flows. Gain constants in the vicinity of 3% cm−1are found, and a twofold improvement of the thermal‐to‐optical conversion efficiency over conventional GDL is predicted.

ISSN:0003-6951    

DOI:10.1063/1.1654545

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

A double‐cavity technique was used to control the duration of the flash‐pumped dye laser emission. Interaction between the two cavities of perpendicular polarization was possible because of the very rapid orientational relaxation of the dye in solution. 30‐ns pulses were obtained with a water solution of rhodamine 6G excited with a fast coaxial flash lamp.

ISSN:0003-6951    

DOI:10.1063/1.1654546

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

By building a He&sngbnd;Xe laser within a hollow dielectric waveguide and by using a single isotope of Xe, we have been able to attain gains of 1000 dB/m. The dispersion associated with these large gains significantly modifies the ``empty‐resonator'' mode spacing when such a medium is placed within a laser resonator. We describe experiments with a short single‐frequency waveguide He&sngbnd;Xe laser in which the gain medium pulls the oscillating frequencies so that the laser always oscillates within ± (1/100) (c/2L) of the center of the Xe net‐gain curve, regardless of the physical length of the laser resonator.

ISSN:0003-6951    

DOI:10.1063/1.1654547

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

A sequence of 50‐ to 75‐nsec high‐voltage pulses in combination with photoionization produce spatially uniform continuous electron densities of 2 × 1011with a 10–20% ripple at 20 000 Hz in 150‐Torr CO2laser mixes. A separate continuous electric field ranging from 3 to 6 kV/cm atm is used to heat the electrons, which loads greater than 0.25 J/cm3atm into the plasma without arc breakdown. As is the case with electron beam plasmas,E/Pandnemay be controlled independently. Hence, electron beams, flow constrictions, etc., are not necessary to produce uniform plasmas for cw high‐power electric gas laser systems.

ISSN:0003-6951    

DOI:10.1063/1.1654548

出版商:AIP    

年代:1973

数据来源: AIP