Ruby laser

About: Ruby laser is a research topic. Over the lifetime, 2474 publications have been published within this topic receiving 38933 citations. The topic is also known as: corundum laser & ruby rod.

Annealing of Te-implanted GaAs by ruby laser irradiation

Abstract: A single pulse of ruby laser radiation is shown to cause significant regrowth in the amorphous region of heavily ion‐implanted GaAs. The implanted Te atoms and the host material both show good channeling dips, suggesting essentially complete substitutionality of the Te. There has been only a minor redistribution of the tellurium atoms. The resulting local Te concentration in the laser‐irradiated sample is more than ten times the known maximum solubility of Te in GaAs.

A clinical study of hair removal using the long-pulsed ruby laser.

Abstract: background. Laser hair removal is rapidly becoming a widely used modality. Clinical studies are needed to assess these hair removal systems. The long-pulsed ruby laser is one such modality for the removal of unwanted hair. objectives. To evaluate the efficacy of the long-pulsed ruby laser (694 nm, 3-msec pulsewidth, 7- or 10-mm spot size) in removing unwanted hair, and to provide treatment guidelines for the proper utilization of this laser system. methods. Forty-eight areas of unwanted facial and body hair from 25 patients with blonde, brown, or black hair were treated with the long-pulsed ruby laser at fluences between 10 and 40 J/cm2. Hair regrowth was measured at 4 weeks after the first treatment, 4 weeks after the second treatment, 4 weeks after the third treatment, and 16 weeks after the third treatment by counting the number of terminal hairs compared with baseline pre-treatment values. All complications and treatment outcomes were documented. results. The mean percent of regrowth after the first treatment was 65.5%, 41% after the second treatment, and 34% after the third treatment. Overall, regardless of skin type or targeted body region, patients who underwent three treatment sessions demonstrated an average 35% regrowth in terminal hair count compared with baseline pretreatment values 6 months after initial therapy. conclusion. Long-pulsed ruby laser treatment resulted in significant hair growth delay in most cases. Repeated laser treatments produced an increased number of vellus hairs, an increase in growth delay, and a decreased percentage of hair regrowth.

Laser assisted cavity preparation and adhesion to erbium-lased tooth structure, part 1 : laser-assisted cavity preparation

Abstract: The use of the ruby laser (693.4 nm) was first described in 1960, and it was applied for hard tissue ablation in 1964. Different wavelengths [Nd:YAG (1.065 microm), CO2 (9.6 microm), Ho:YAG (2.12 microm)] were consequently explored. Due to massive thermal side effects, these wavelengths caused increased temperature in dental pulp, as well as microcracks and carbonization. The use of this laser for dental hard tissue preparation was eventually abandoned. At the end of the 1980s, excimer lasers (ultraviolet) and the erbium laser (infrared) were developed, with the advantages of improved temperature control and smaller penetration depths. With the development of smaller devices and improved knowledge of how to limit damage to the surrounding tissues, new ablation techniques were established in the 1990s. There is still contradiction in the current literature, however, in that different wavelengths are advocated for hard tissue removal, and heterogeneity in laser parameters and power densities remain. In this review, the effects of the wavelengths presently used for cavity preparation are evaluated. We conclude that erbium lasers (Er:YAG and Er,Cr:YSGG) are most efficient and, with the right parameters, the thermal side effects are small. There is a substantial need for "gold standards", although this is difficult to establish in practice owing to different laser parameters (including pulse repetition rate, amount of cooling, energy delivered per pulse, and types of pulses) and target specificity (tissue interaction with sound or decayed enamel or dentin, and the extent of (de)mineralization) which influence tissue interaction.

Pulsed lasers in electronic speckle pattern interferometry

Abstract: This paper describes the incorporation of a pulsed ruby laser into an electronic speckle pattern interferometer. A technique is described for observing vibrational and transient events with a double pulsed laser and some typical results are given. Results of the application of the interferometer to non-destructive testing are included.

The Effect of Q-Switched Ruby Laser Radiation on Dermal Tattoo Pigment in Man

Abstract: SURGICAL tattoo removal is generally unsatisfactory. 1 Total excision or partial excision in stages usually leaves a noticeable, wide scar. Complete excision and skin grafting not only scar the site of the tattoo but the skin graft donor site as well. Many patients accept the surgical treatment for tattoos only because the social stigma of the tattoo is of greater hindrance than the scarring. The laser is uniquely adapted for this surgical problem. Emitting a brief (8 to 10 nanosecond (nsec) Q-pulsed; 1.8 msec long pulse) narrow band (6,943 Angstroms) of high energy light (100 megawatt), the ruby laser beam, as any light, is absorbed more by dark substances than by light substances. A large amount of laser energy is delivered accurately to the target area and one is able to capitalize on the differential uptake of light energy by dark versus light materials. It can be done without