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We use the dicing of the sample into the cleavage. 11, the optical-cavity surface-film deposition: Evaporation rate of the index of refraction, scattering, stress, hardness, etc. have significant impact on the substrate temperature affect material adhesion coefficient and film thickness, and structure. Evaporation rate and substrate temperature process conditions determine the film characteristics, such as refractive index, stress, hardness. We have the die cavity surface before and after electron beam evaporation, respectively, the reflection rate of 5% and 95% of the dielectric film; 12, the carrier production: a lot of heat generated when the laser work, heat must be timely in order to maintain their normal work, the carrier is The main part of laser cooling. Therefore, in order to achieve a good cooling purposes, the carrier material must be selected. It is the applicable occasions of green laser pointer.
On the one hand, the carrier material should be a good conductor of heat, pollution and does not die with the physical properties of the laser to match the coefficient of thermal expansion is mainly the same or close to; other hand, the carrier material should have the ease of processing, and laser burn die welding easy, and high reliability. Heat to smooth the surface of the carrier, the carrier cooling process qualified solder layer can effectively reduce the thickness of the thermal resistance of the device to reduce the junction temperature decreases, increase the device's optical power. We use the carrier material is tungsten copper, tungsten copper thermal expansion coefficient and die approximation, the carrier and the die can be reduced due to thermal expansion coefficient between the different causes of degradation; 13, sintering: laser junction temperature is an important factor affecting the life, The higher the junction temperature, the shorter life expectancy. Junction temperature affected by many factors. green laser pointer can benefit the customer in every way.
Through experiments, we used a gold-tin alloy as the sintering of high-power semiconductor laser chip solder plating process used in the gold-plated tungsten-tin solder on a copper carrier, and strictly control the coating thickness. In gas, the heat carrier on the gold-tin, to melt. Chip stuck or shrink the chip after the carrier will be uneven heating during use, thereby seriously affecting life. Gas effectively reduce the thermal resistance due to the increase caused by oxidation, reduce the contact resistance to achieve a good weld. 14, test: X-ray double-crystal epitaxial layer diffraction curve can evaluate the crystal quality of epitaxial material, between the flatness of the epitaxial layer to calculate the Al composition in the epitaxial material, calculate the waveguide layer and the cladding layer was Al composition whether to meet the design requirements. green laser pointer are the best assistants for you to deliver a speech.
Calculated from the IV curve IdV / dI-I curve by IdV / dI-I curves obtained threshold current of 12 Yanbian University undergraduate thesis, series resistance, section characteristic parameters m, sink height h, the vertical axis intercept b, early the beginning of the peak number. Sink height h and the device series resistance of the material structure and, h small, poor reliability. Vertical axis intercept b larger, indicating that the leakage current increase. More than the initial peak number of devices susceptible to degradation. 13 conclusion of Yanbian University undergraduate thesis paper first introduces the laser principle, characteristics and other relevant theoretical knowledge, followed by laser leads to the basic structure and working principle of this paper, the long-wavelength semiconductor lasers are discussed. On this basis, proposed a long-wavelength laser diode design, including material growth and design, die design, reliability design, and finally to the production process research. green laser pointer are the pilotages of the expansive outer space.
The principle of laser light by stimulated emission of light, so that the atoms in the excited states of light by external incentives and transition to a low energy level, also issued a photon with exactly the same external photon excitation, in order to achieve light amplification. Purports to stimulated emission of light as a major process, need to make light-emitting material in the excited state energy level than the low-energy particles on the particle level, ie the distribution of inversion, but also to make such a medium by the stimulated emission a dominant role. Development of electronic technology to provide an incentive energy, precision processing technology to create a resonant cavity, materials science research to provide a variety of laser working substance, in such conditions, the birth of another variety of lasers, including the long-wavelength semiconductor lasers. green laser pointer could serve as the best pointers.