Structure and evolution of pulsed surface discharges in noble gases

This paper looks at the structure and evolution of pulsed surface discharges in noble gase

Development of pulsed surface discharges for pumping dye lasers

This paper looks at the development of pulsed surface discharges for pumping dye laser

Optical emission properties and behaviour of pulsed surface discharges

An investigation has been undertaken into the influence of parameters such as the nature of the cover gas, the dielectric substrate, and the circuit parameters on the performance of surface discharges used as optical sources. The effects of the magnitude and duration of the driving voltage pulse on the radiated optical output from a pulsed surface discharge in an SF/sub 6/-Ar gas mixture over a sapphire substrate have been measured within six spectral bands. It has been shown that the parameters studied can significantly affect the spectral distribution of the output of optical energy within these bands. The results show that the efficiency of optical emission within the 200-300 nm spectral band increases as the driving pulse duration increases from 250 to 1100 ns. This is in contrast to that found within the other spectral bands. The efficiency of optical emission in the 200-300 nm band has also increased with increasing discharge current, in contrast to the decrease observed for wavelengths greater than 700 nm

The energy distribution of the emission spectrum from pulsed surface discharges

This paper describes the results of an investigation into effect of the driving current pulse duration on the spectral distribution of radiated optical energy from a surface-discharge. The optical energy radiated from a pulsed surface discharge in an SF6/Ar gas mixture over a sapphire substrate was measured in six spectral bands; namely the 200-300 nm, 300-400 nm, 400-500 nm, 500-600 nm, 600-700 nm and that contained above the 700 nm wavelength. Three current levels were investigated and the pulse duration was varied in the range 250 ns-1100 ns in steps of 250 ns. The results have shown that the driving current magnitude and pulse duration affects significantly the distribution of the output optical energy within the spectral bands of interest. The results show that the efficiency of optical emission within the 200-300 nm spectral band increases from 25% to 37% as the driving pulse duration increases from 250 ns to 1100 ns. This is in contrast to the other spectral band

The air-injection method of fixing boundary-layer transition and investigating scale effects

SIGLEAvailable from British Library Document Supply Centre- DSC:8717.806(RAE-TR--85025) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

An investigation into the optical emission from pulsed planar surface discharges and their application for the pumping of dye lasers

This investigation is concerned with the use of pulsed planar surface discharges for the pumping of organic dye doped modified PMMA slabs. A 0.5 Omega, lumped element pulse forming network was used to drive a surface discharge across a 4 mm thick, pyrromethene 597-doped modified PMMA slab in the presence of a 0.5 bar xenon cover gas. A laser energy of 69 mJ was recorded when 100 J of capacitively stored energy was discharged across the polymer slab. To the authors' knowledge this is the first time laser action has been reported from a surface discharge pumped solid state dye laser