[en] We have designed and fabricated submounts from synthetic diamond grown by microwave plasma chemical vapour deposition and developed an economical process for metallising such submounts. Laser diode chips having an 808-nm emission wavelength, 3-mm-long cavity and 130-mm-wide stripe contact were mounted on copper heat sinks with the use of diamond submounts differing in quality. The devices were tested for more than 150 h in continuous mode at an output power of 8 W on diamond with a thermal conductivity of 700 W m^-1 K^-1, and no changes in their output power were detected. On diamond with a thermal conductivity of 1600 W m^-1 K^-1, stable cw operation for 24 h at an output power of 12 W was demonstrated. (letters)

[en] The blister-based laser-induced forward transfer (BB-LIFT) of single-walled carbon nanotubes (SWCNTs), both raw and dispersed in carboxymethyl cellulose films, is demonstrated. Under optimized laser fluences, ejection of the SWCNTs from the donor substrate was driven by fast blistering of an underlying aluminum film that was not accompanied by its rupture. To transfer the ‘polymer/nanotube’ composite, the basic BB-LIFT technique was modified by adding preliminary cutting of the donor layer into square pixels due to total ablation of both the metal and composite in the areas between the pixels. Micro-Raman investigations have proved that SWCNTs are transferred without significant degradation in both cases. (paper)

[en] A coating technology for application of hardening of diamond coatings on carbide tools for treatment of mineral fiberglass based on quartz texture with chromate-phosphate cohesive (FQTCC) is proposed. The purpose of this development is to increase the edge strength of the tool. The use of the technology described above allowed, in comparison with the cutter without diamond coating, to increase the productivity of processing by 11.5 times, by cutting speed by 2.3 times, and by the minute supply by 5.0 times. The approach is based on changing the configuration of the microwave field when applying a diamond coating on hard alloy substrates in the microwave plasma of the ARDIS-100 reactor by using specially designed plateholders. This method allows for the group coating on several substrates in a single process. A simplified mathematical model for calculating the temperature of the top of the cutter during the growth of a CVD diamond film, taking into account heat transfer through thermal conductivity and radiation, has been constructed. Temperature distribution on the surface of a tungsten carbide cutter in the temperature range optimal for diamond growth was constructed. The difference between the average (experimental) and maximum (calculated) temperature in such a cutter was from 80 to 138°C. (paper)

[en] Polycrystalline diamond (PCD) films 100 mm in diameter are grown by 915 MHz microwave plasma chemical vapor deposition (MPCVD) at different process parameters, and their thermal conductivity (TC) is evaluated by a laser flash technique (LFT) in the temperature range of 230–380 K. The phase purity and quality of the films are assessed by micro-Raman spectroscopy based on the diamond Raman peak width and the amorphous carbon (a-C) presence in the spectra. Decreasing and increasing dependencies for TC with temperature are found for high and low quality samples, respectively. TC, as high as 1950 ± 230 W m⁻¹ K⁻¹ at room temperature, is measured for the most perfect material. A linear correlation between the TC at room temperature and the fraction of the diamond component in the Raman spectrum for the films is established. (paper)