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Tuesday, August 4, 2020 | History

1 edition of Investigations on a hollow cathode He-Cd ion laser found in the catalog.

Investigations on a hollow cathode He-Cd ion laser

Investigations on a hollow cathode He-Cd ion laser

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Published by Hungarian Academy of Sciences, Central Research Institute for Physics in Budapest .
Written in English


Edition Notes

Statement(by K. Rózsa (and others).
SeriesKFK1-73-39
ContributionsRózsa, K. S., Magyar Tudományos Akadémia. Központi Fizikai Kutató Intézet.
The Physical Object
Pagination(2), 5 p.
ID Numbers
Open LibraryOL20881931M

Mode investigation of a hollow-cathode transverse discharge He-Cd ion laser showed single mode operation without using any selection.   This article describes the development of hollow cathode ion lasers and their use in constructing an ultraviolet micro-Raman spectrograph with native fluorescence imaging capability. Excitation at nm is provided by a helium–silver hollow cathode metal ion laser and at nm by a neon–copper hollow cathode metal ion laser. Refractive microscope objectives focus chopped .

Investigations were carried out on the Ar-II nm laser to obtain information on possible excitation mechanisms. The He-Ar hollow cathode discharge was excited by square wave current pulses. From the results of measurements it could be concluded that collisions of the second kind between He 23 S metastable atoms and ground state Ar ions are dominant in the excitation of the upper laser level. A hollow cathode wear-test of 50s hours was successfully completed at an emission current of A and a xenon flow rate of 10 Pa-Lls. This test was the continuation of a hollow cathode contamination investigation. Discharge voltage was stable at V. The cathode temperature averaged oC with a 7% drop during the wear-test.

A hollow-cathode lamp (HCL) is type of cold cathode lamp used in physics and chemistry as a spectral line source (e.g. for atomic absorption spectrometers) and as a frequency tuner for light sources such as HCL takes advantage of the hollow cathode effect, which causes conduction at a lower voltage and with more current than a cold cathode lamp that does not have a hollow cathode. of the hollow cathode assembly has become a major life limiting mechanism for electric propulsion systems. However, the hollow cathodes appear to be the least well understood of all the components in the thruster. After nearly 40 years of investigation and decades of use in thrusters, there are no definitive models of the plasma density.


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Investigations on a hollow cathode He-Cd ion laser Download PDF EPUB FB2

An experimental setup for hollow cathode independent life test simulating Hall thruster discharge current oscillations Advances in Space Research, Vol. 62, No. 9 Effect of relative position between cathode and magnetic separatrix on the discharge characteristic of Hall thrustersCited by:   Vol number 4 OPTICS COMMUNICATIONS 15 March He-Kr ION LASER IN A D.C.

HOLLOW CATHODE DISCHARGE M. JOSSY, K. RSA, P. APAI and L. CSILLAG Central Research Institute for Physics, H Budapest, P.O. Hungary Received 29 November Laser oscillation at the nm and nm transitions of Kr II was obtained in a d.c.

hollow cathode Cited by: Investigations on a high voltage hollow cathode HeKr laser the A Kr ion and the A Ar ion transitions. CW laser oscillation was observed for the first time at the A and A.

Investigations were carried out on the Ar-II nm laser to obtain information on possible excitation mechanisms. The He-Ar hollow cathode discharge was excited by square wave current pulses.

Laser oscillation was investigated at the nm and nm transitions of Kr II in a d.c. excited hollow cathode He-Kr discharge. A water-cooled discharge tube was used in the experiment with an active length of 40 cm and an inner diameter of 3 mm. The laser was operated at a maximum current of 4 A, voltage being V.

Optimum He and Kr partial pressures were found to depend on discharge. CW laser oscillation on transitions of Al II was re- ported recently in Ne hollow cathode discharges where cathode sputtering was used to produce Al vapour [1, 2].

In this letter we report results of our Investigations on a hollow cathode He-Cd ion laser book on an Al ion laser operating in a hollow cathode dis- charge with a special internal anode system. Warm-up is a major consumer of lifetime of competitive laser technologies. Hollow Cathode OEM Laser Cost.

The inherent cost of these lasers is low. Basic laser tube prices can be less than $ with power supply cost less than $ in OEM quantities.

We believe the biggest barrier to commercial application of these lasers is not cost or price. Fig. Typical hollow cathode geometry of a refractory metal tube with an emissive insert inside and a heater wrapped on the outside. Fig. The three plasma regions in a hollow cathode.

the orifice plate. This insert is the active electron emitter, and it can be made of several different materials that provide a low work function surface. Baczyñski, M. Dzwonkowski, and P. Targowski, The influence of ignition method on laser output of pulse hollow cathode copper ion laser, Opt.

Appl. XIII () Google Scholar Hollow cathode lasers are represented in two guises: 'white light' (blue/green/red) He-Cd ̄+ ion lasers and UV/infrared Ne/He-Cu ̄+ ion lasers.

This unique volume is an essential reference source for all those working on metal vapour lasers, and all those who use them, from postgraduate students through to experienced scientists and engineers. Previous ion thruster and hollow cathode life tests have shown erosion of hollow cathode components that could lead to failure of a thruster during a long mission [].It is presumed that ions created in the plasma region downstream of the cathode were those that caused the cathode surface wear [5, 6].The erosion is dependent on the number of ions that hit the surface, ion species, ion.

Through detailed electrochemical investigations of both VONTs and poly-NRs, we confirm that the removal of the amine-template from the VONTs and the thermally induced phase conversion to a polycrystalline structure improves specific capacity during discharging and charging as a Li-ion battery cathode material in the absence of a polymeric.

We have observed five laser transitions in the –‐nm region, all of which originate from excited energy levels of singly ionized aluminum. Laser action was obtained by exciting a neon buffer gas in an aluminum hollow cathode and the excitation mechanism is thought to be a Ne + ‐Al charge transfer reaction.

Single‐line output power on the ‐nm laser transition of Al II was 9 mW. the results of a 13, hour life test of a mercury hollow cathode in 2 The orifice plate had eroded from the downstream end, and Rawlin hypothesized that the erosion was caused by high-energy ions created during the large voltage oscillations in plume mode.

2 Experimental investigations of hollow cathodes at NASA GRC, HRL, and JPL. Open abstract View article, He-Cd hollow-cathode oscillations in an axial magnetic field PDF, He-Cd hollow-cathode oscillations in an axial magnetic field The influence of the axial magnetic field on the output of a hollow-cathode Cd-He laser oscillating on the and nm lines is studied for various discharge conditions.

The hollow cathode effect allows electrical conduction at a lower voltage or with more current in a cold-cathode gas-discharge lamp when the cathode is a conductive tube open at one end than a similar lamp with a flat cathode.

The hollow cathode effect was recognized by Friedrich Paschen in In a hollow cathode, the electron emitting surface is in the inside of the tube. Hollow cathode lasers are represented in two guises: 'white light' (blue/green/red) He-Cd¯+ ion lasers and UV/infrared Ne/He-Cu¯+ ion lasers.

This unique volume is an essential reference source for all those working on metal vapour lasers, and all those who use them, from postgraduate students through to experienced scientists and engineers.

Replacement for Shimadzu Atomic Absorbtion Spectroscopy Hollow Cathode Lamp (uncoded 2-pin) Copper Cu Light Bulb by Technical Precision $ $ 44 FREE Shipping. Lasing properties of active media in sputtered hollow cathode discharge (HCD) He-Cu lasers operating on nm transition have been investigated for several HC configurations.

Direct measurements of small-signal gain and its spatial distribution have proved that a segmented hollow cathode discharge (SHCD) is the most efficient in achieving. This article describes the development of hollow cathode ion lasers and their use in constructing an ultraviolet micro-Raman spectrograph with native fluorescence imaging capability.

Excitation at nm is provided by a helium–silver hollow cathode metal ion laser and at nm by a neon–copper hollow cathode metal ion laser. American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA This is a review of the recent investigations on He- Cd +, He-Kr +, He-Ar +, He-Se + and He-Cu + lasers excited with the transverse capacitively coupled radio-frequency discharge.

The recent investigations show that the designs and operation of the radio-frequency excited lasers are much simpler than those of the hollow-cathode discharge lasers at the similar laser output parameters.investigation of energetic ion efflux using a hollow cathode in a ring cusp discharge chamber was made primarily to determine the nature of the ion efflux in a thruster-like environment.

The magnetic field near the cathode tip was approximately 90 G. For this study the hollow cathode .