Topic
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.
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TL;DR: In this article, the authors compared the thermal damage threshold by pulsed ruby laser radiation on a series of ceramics including graphite, graphite and pyrocarbon, and showed reasonably good agreement between the different testing methods within a range of different power densities and pulse lengths from 5 μs to 3 s.
29 citations
TL;DR: In this paper, a Q-switched, frequency-doubled ruby laser has been used to generate wide bandwidth ultrasonic transients in aluminum and steel plates, both longitudinal and shear waves were generated, resultant waveforms being dependent upon the irradiation conditions.
Abstract: A Q‐switched, frequency‐doubled ruby laser has been used to generate wide bandwidth ultrasonic transients in aluminum and steel plates. Both longitudinal and shear waves were generated, resultant waveforms being dependent upon the irradiation conditions. Various designs of electromagneticacoustic transducers were then used to detect these waveforms at the opposite side of the plate. The result is a method of ultrasonic inspection with potential in noncontact applications.
29 citations
TL;DR: The long‐pulsed ruby laser is a promising, well‐tolerated method of epilation and was scored as the least painful way to treat unwanted hair growth.
Abstract: Background. Unwanted hair growth is a common, usually physiologic phenomenon.
Objective. In this study the efficacy and tolerability of a long-pulsed ruby laser system was compared with needle electrolysis and hot wax on three parts of the body.
Methods. Thirty volunteers were treated three times on the forearm (n = 10), on the face (n = 10), or in the pubic area (n = 10) with 25 J/cm2 laser, 40 J/cm2 laser, needle electrolysis, and hot wax therapy.
Results. The 25 J/cm2 and 40 J/cm2 laser treated sites showed a statistically significant decrease (38% and 49%, respectively) in the number of hairs at the first visit after the last treatment compared to the pretreatment hair counts. No significant decrease was observed in the needle electrolysis and hot wax treated sites. Laser therapy yielded better results on the forearm than on the face or pubic area and was scored as the least painful.
Conclusion. The long-pulsed ruby laser is a promising, well-tolerated method of epilation.
29 citations
TL;DR: In this article, the first experiment of thermomagnetic writing of a hologram on a thin film of EuO and the reconstruction of the hologram was reported, which was achieved by using a giant pulsed ruby laser as a source for thermomagnetization.
Abstract: In this paper the first experiment of thermomagnetic writing of a hologram on a thin film of EuO and the reconstruction of the hologram is reported. Writing of the hologram is achieved by using a giant pulsed ruby laser as a source for thermomagnetization. Erasing of the hologram is accomplished by a small applied magnetic field. The ruby laser is used because of its ability to provide the energy required for writing in a time that is short compared with the thermo‐relaxation time. A hologram with shallow angle (10 μ resolution) was recorded and the reconstruction of the hologram was done using a He–Ne laser as a source. The formation of the hologram is based on the fact that the index of refraction of the material is a function of magnetization. Thus, the different state of magnetization induced by the laser pulse acts as a phase‐hologram for polarized light. Polarizing elements were used to observe the reconstructed images from the magnetic holograms. Results were also obtained for the diffraction intensity in the different orders of a simple thermo‐magnetic hologram. An analysis is presented to interpret the observed phenomena and gives the calculated efficiency that can be obtained under ideal conditions.
29 citations
TL;DR: In this article, the frequency-tunable generation by means of F2+ and F2− color centers in a LiF crystal is reported. But the frequency tuning is obtained in the range of 0.88-1.25 μm.
Abstract: Frequency-tunable generation by means of F2+ and F2− colour centers in a LiF crystal is reported. Colour centers were created by illuminating LiF crystals with electrons of 3 meV energy at the electron current density of 1 μA/cm2. The pumping source was a ruby laser with a peak power of 20 MW, a pulse duration of 20 ns, and a repetition rate of 1 Hz. The frequency tuning is obtained in the range of 0.88–1.25 μm. Discussed are the ways of pumping of colour centers and the possibility of lasing in the spectral region of 0.85 to 2 μm in the type of colour centers under investigation.
29 citations