&lt;title&gt;Arc driven supersonic cw HF chemical laser&lt;/title&gt;

Electric arc is a safe alternative to combustion for dissociation of SF 6 required for optimizing the experiments related to development of hydrogen fluoride/deuterium fluoride (HF/DF) laser. The plasma arc discharge in an arc heater/generator is essentially employed for inducing thermal dissociation of SF 6 for production of fluorine atoms. Another accrued advantage of using arc heater is that there is a possibility of varying the composition of the lasing mixture independently of the pressure and temperature of its constituents. However, in order to use arc heater for lasers applications, it is not only necessary to have an efficient arc heater, but interfacing it with the Data acquisition system and the laser tunnel is equally important. The paper reports the basic design and performance of 50 kW arc plasma tunnel relevant for hydrogen fluoride/deuterium fluoride (HF/DF) laser applications. Complete instrumentation required for testing and its integration with the simulated laser tunnel has been implemented. The arc behavior has been studied on the developed 50 kW arc heater with Nitrogen using a dedicated data acquisition system employing fibre optics link to cater for electromagnetic noise and hostile environment. The 50 kW arc generator should serve as a versatile tool for optimizing lasers parameters such as gas flow rate, pressure, temperature and Mach number for a kilowatt HF/DF Laser.

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“…The configuration of 50 kW is based on the inputs from the studies of other workers who have used similar power levels for a kW laser power. 21 …”

Section: Articlementioning

confidence: 97%

Performance and Control of 50 kW Arc Heater for Chemical Lasers

Sagar¹,

Kant²,

Singhal³

et al. 2012

j adv phys

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“…[2); it uses also a blowdown tunnel in order to obtain the supersonic flow; 22 seconds of laser beam are available during one test and two tests are separated by approximately 15 minutes. [2); it uses also a blowdown tunnel in order to obtain the supersonic flow; 22 seconds of laser beam are available during one test and two tests are separated by approximately 15 minutes.…”

Section: Champions (Co2 and Nd:yag) And Challengers (Co And Hf)mentioning

confidence: 99%

Influence of the wavelength for infrared laser effects on metals and dielectrics

Joeckle¹,

Stevens

Stern³

et al. 1994

SPIE Proceedings

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Two high power mid-JR gas lasers, the CO laser and the chemical HF laser, can offer higher absorption for metals and better focusing, i.e. smaller spot areas than CO2 and Nd:YAG lasers. A comparison ofthe effects of three gas lasers is carried out at the ISL, using three high-power gas lasers : 1 kW (HF), 6 kW (CO) and 7.5 kW (C02) and allows to compare their effects on different materials.The absorptivity of these laser beams for several metals has been measured, both th low energy measurement techniques and with high power laser beams; an increase in absorptivity has been demonstrated for the short wavelengths lasers.Plexiglass irradiated with these lasers beams exhibits a boiling-type destruction behaviour. The threshold fluence for the occurence of the bubbles has been measured and compared with a simple boiling model showing the importance ofthe spectral absorption coefficient.High power lasers have been developed in the CEI and (for industrial applications) in Japan and in Germany. Cooling of the laser gas is obtained, either cryogenic using a liquid nitrogen heat exchanger or by O19413763194'$6.00

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“…In order to overcome this drawback and to have laboratory a useable HF=DF laser, an arc tunnel is used for optimization of various laser parameters. [7][8][9] The arc heater is used to create fluorine atoms by thermal dissociation of SF 6 , which is a very safe gas as compared to other fluorine-based gases in laboratory environment. The arc heater has the advantage that it allows for independent variation of gas composition with respect to temperature and pressure, thereby permitting an ideal gas mixture ratio at required temperature and pressure conditions for longer run times.…”

Section: Introductionmentioning

confidence: 99%

Data Acquisition System for Arc-Driven Hf/Df Chemical Lasers

Sagar

Kant

Mainuddin

et al. 2012

Instrumentation Science & Technology

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& The article focuses on the development of a data acquisition system (DAS) working in a noisy and hostile environment for an arc-operated hydrogen fluoride=deuterium fluoride (HF=DF) chemical laser. PC-based DAS has been configured using Advantech plug and play modules with fiber link connectivity. This article also focuses on implementation of an orifice-based precise gas flow control system. The plasma arc discharge in an arc heater=generator is essentially employed for inducing thermal dissociation of sulfur hexafluoride SF 6 for production of fluorine atoms, and DAS has been used for performance optimization of the composition of the lasing mixture by independently varying the flow rate, pressure, and temperature of its constituents. Since arc load is complex with high voltage transients and electromagnetic noise, an optical fiber link has been implemented for data transmission. This article also discusses digital output interface circuitry for various electro-pneumatic actuators=solenoid valves. The developed DAS has been used for monitoring and performance evaluation of parameters for 50 kW arc tunnel.

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<title>Arc driven supersonic cw HF chemical laser</title>

Abstract: The design, construction and operational characteristics of an arc driven supersonic cw HF chemical laser of more than I kW power, which has been developed for laser-material investigations, are presented. Overtone lasing has also been obtained with a power of 220 W.

Cited by 3 publications

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Performance and Control of 50 kW Arc Heater for Chemical Lasers

Performance and Control of 50 kW Arc Heater for Chemical Lasers

Influence of the wavelength for infrared laser effects on metals and dielectrics

Data Acquisition System for Arc-Driven Hf/Df Chemical Lasers

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