21 April 2016 Laser forming of emitting structure of metal-porous cathodes
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Abstract
Metal-porous cathode is an electrovacuum EHF device, providing a high density of emission current. The emitting surface of the device is usually obtained by ion etching. The emitting layer is made of a porous sponge of a refractory metal, usually tungsten. Through the pores of the sponge alkaline earth metals and their oxides are delivered to the emitting surface. One of the most important parameters of the cathode is a uniformity of emission, depending on regularity of the location of pores.

We describe a method of laser modification of metal-porous cathode surface, instead of traditional ion etching. The preferences of laser etching are uniformity of pores, absence of deformation of surface, opportunity to specify the necessary size of the pores and the distance between them.

Laser structuring of the cathode surface was implemented by laser micrograving. The resulting structure is a field of pores, diameter 15 μm, with spacing of 20 μm.
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Ivan A. Popov, Tatiana N. Sokolova, Elena L. Surmenko, Dmitry A. Bessonov, Yury V. Chebotarevsky, Georgy V. Sakhadzhi, Tatiana M. Krachkovskaya, "Laser forming of emitting structure of metal-porous cathodes", Proc. SPIE 9917, Saratov Fall Meeting 2015: Third International Symposium on Optics and Biophotonics and Seventh Finnish-Russian Photonics and Laser Symposium (PALS), 99173D (21 April 2016); doi: 10.1117/12.2229857; https://doi.org/10.1117/12.2229857
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