Oscillator performance and energy extraction from a KrF laser pumped by a high-intensity relativistic electron beam

Rice, James K.; Tisone, G. C.; Patterson, E. L.

doi:10.1109/jqe.1980.1070423

Cited by 70 publications

(14 citation statements)

References 6 publications

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“…These measurements made in oscillator mode were evaluated using Rigrod analysis to find the effect of window transmissivity and operation in oscillator mode to the laser output and efficiency in amplifier mode [17]. The experiments on Electra are consistent with the previously published results of 12-14% intrinsic amplifier power efficiencies [18][19][20]. Electra measurements have shown the maximum intrinsic efficiency can be attained over a range of laser composition including additions of Helium, which increases the thermal conductivity of the laser gas [20].…”

Section: Efficiencysupporting

confidence: 77%

KrF Laser Development for Fusion Energy

Wolford

Sethian

Myers

et al. 2013

Plasma and Fusion Research

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The United States Naval Research Laboratory is developing an electron beam pumped krypton fluoride laser technology for a direct drive inertial fusion energy power plant. The repetitively pulsed krypton fluoride laser technology being developed meets the fusion energy requirements for laser beam quality, wavelength, and repetition rate. The krypton fluoride laser technology is projected, based on experiments, to meet the requirements for wall plug efficiency and durability. The projected wall plug efficiency based on experiments is greater than 7 percent. The Electra laser using laser triggered gas switches has conducted continuous operation for 90,000 shots at 2.5 Hertz operation (ten hours). The Electra laser has achieved greater than 700 Joules per pulse at 1 and 2.5 Hertz repetition rate. The comparison of krypton fluoride laser performance with krypton fluoride kinetics code shows good agreement for pulse shape and laser yield. Development and operation of a durable pulse power system with solid state switches has achieved a continuous run of 11 million pulses into a resistive load at 10 Hz.

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Section: Efficiencysupporting

confidence: 77%

KrF Laser Development for Fusion Energy

Wolford

Sethian

Myers

et al. 2013

Plasma and Fusion Research

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“…In a last step, the small-signal gain g 0 , the unsaturated losses α and the saturation intensity I sat were deduced following the analysis of Rice et al 8 Therefore, the extracted intensity I out − I in of the laser was plotted as a function of ln (I out /I in ), as shown in Fig. 6.…”

Section: Resultsmentioning

confidence: 99%

“…The input power was measured by reflecting a part of the laser beam (PR1 ) through a filter (λ = (214 ± 12) nm) onto a photodiode (PD1 ). The input intensity was varied such that from the amplified signal values for the small-signal gain g 0 , nonsaturable losses α and saturation intensity I sat were calculated following the analysis of Rice et al 8 A focusing lens (L, focal length f = 1 m) and partial reflectors (PR2 ) with different reflectivity were used to increase or decrease the input intensity. The energy loss of the beam by passing through the lens was measured and taken into account in the data analysis.…”

Section: X-raymentioning

confidence: 99%

Gain and fluorescence in a long-pulse KrCl laser

Casper

Bastiaens

Peters

et al. 2006

XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers

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The net small-signal gain was measured in a discharge-pumped KrCl laser (222 nm) operated at high gas pressures of around 3.3 bar. The pump power-density was varied between 200-650 kW cm −3 . The experiments were carried out on a three-electrode laser system. The net small-signal gain was measured in an oscillatoramplifier configuration and reached up to 1.4 % cm −1 . Values for the small-signal gain g 0 of 1.50 % cm −1 , the nonsaturable absorption α of 0.07 % cm −1 and the saturation intensity I sat of 0.8 MW cm −3 were calculated for a specific power-density of 320 kW cm −3 .

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“…As discussed in Ref. 8, these quantities cannot be completely determined from oscillator performance data alone. Amplifier performance data are also required.…”

Section: Analytical Model For Amplifier Performancementioning

confidence: 99%

Effect of gain length on hydrogen fluoride chemical laser amplifier performance

Waldo

Sentman

1993

AIAA Journal

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An amplifier performance model that predicts a device's amplifier performance given the device's oscillator performance as a function of reflectivity was developed. Excellent agreement between single pass model predictions and single pass experimental data was obtained. The model was used to predict amplifier performance as the gain length was scaled from 0.3 to 4 m for three different lasers. When the amplifier performance curve is plotted in terms of nondimensional powers font vs ft n , gain length dependent, device independent curves result. The nondimensional amplifier performance curve showed that, with a single pass amplifier, one 0.3-m oscillator may be able to drive three amplifiers and one 4-m oscillator might be able to drive eight amplifiers. These results, which are independent of device, are sensitive to the oscillator power vs reflectivity performance curve in the 0-20% reflectivity range.AR g go / I s L e L g P in ou t am /? eff Nomenclature = amplification ratio, P ou t/^m = gain coefficient, cm" 1 = zero power or small signal gain coefficient, cm" 1 = radiation flux, W/cm 2 = saturation radiation flux, W/cm 2 = thickness of the mixed flow ( = L g when fully mixed) = geometric gain length = input power to the amplifier = P out , output power from the amplifier = output power from the oscillator = effective reflectivity of the oscillator's resonator reflectivity of the outcoupler mirror times the reflectivity of the feedback mirror = coordinate in the direction of the optical axis = nonsaturable distributed loss, cm" 1 = P0ut ~ ^in = power/nozzle bank exit area, W/cm 2 = nondimensional input power (input power to the amplifier/output power from the oscillator at z a eff = f out = nondimensional output power (output power from the amplifier /output power from the oscillator at # eff -20%)

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Oscillator performance and energy extraction from a KrF laser pumped by a high-intensity relativistic electron beam

Cited by 70 publications

References 6 publications

KrF Laser Development for Fusion Energy

KrF Laser Development for Fusion Energy

Gain and fluorescence in a long-pulse KrCl laser

Effect of gain length on hydrogen fluoride chemical laser amplifier performance

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