Showing papers on "Ruby laser published in 2014"

Fractional CO2 laser is as effective as Q-switched ruby laser for the initial treatment of a traumatic tattoo.

Abstract: Background and objective: Q-switched laser treatments are considered the standard method for removing both regular and traumatic tattoos Recently, the removal of tattoo ink using ablative fractional lasers has been reported Ablative fractional CO2 laser and q-switched ruby laser treatments were used in a split-face mode to compare the safety and efficacy of the two types of laser in removing a traumatic tattoo caused by the explosion of a firework Study design/Patients and methods: A male patient suffering from a traumatic tattoo due to explosive deposits in his entire face was subjected to therapy A series of eleven treatments were performed The right side of the face was always treated using an ablative fractional CO2 laser, whereas the left side was treated only using a q-switched ruby laser Results: After a series of eleven treatments, the patient demonstrated a significant lightening on both sides of his traumatic tattoo, with no clinical difference After the first six treatments, the

Dual-laser calibration of Thomson scattering systems in ITER and RFX-mod

Abstract: We first review the principles of the dual-laser calibration technique for measuring the relative sensitivities of the spectral channels in a Thomson scattering (TS) diagnostic system by detecting with the same spectrometer the spectra scattered by the same plasma volume from two laser pulses of different wavelengths. A new data analysis method is then introduced, based on the minimization of a single χ2 function, that provides a simpler and more convenient way to determine the measurement errors on the calibration coefficients. The new analysis method is used here to investigate the expected performances of this calibration technique in the core LIDAR TS system of ITER currently under design and in the conventional multipoint TS system of RFX-mod. By calculating the expected calibration errors for typical plasma scenarios we discuss the different possible choices of the calibration laser, the characteristics of the calibrating plasma and other system parameters with an impact on the application of the technique. For ITER core LIDAR TS, designed with Nd : YAG at 1064 nm as main laser, a ruby laser shows slightly better performances as a calibration laser compared with a second harmonic Nd : YAG and a calibration accuracy ~1% can be achieved in a relatively small number of pairs of laser pulses. In RFX-mod the combination of a Nd : YAG and a Nd : YLF laser systems is the only viable choice, and we find that, in spite of the small difference between the two wavelengths (λ = 1064 nm and λ = 1053 nm, respectively), dual-laser calibration is still possible to the required accuracy with an affordable number of pairs of laser shots.

Laser–Matter Interaction in LIBS Experiments

Abstract: Some of the physical processes occurring during the formation and expansion of the laser induced plasma are briefly reviewed. Their knowledge elucidates the role of the various effects in the energy flow from the laser pulse to the observed spectroscopic quantities, the parameters of interest in LIBS measurements, via all the intermediate mechanisms such as electron and ion heating, thermal diffusion, plasma formation, expansion, and particle ablation and kinetics.

Llc 공진형 컨버터를 적용한 의료용 루비 레이저 전원장치 개발

Abstract: LLC resonant converter is used to control laser power density in ruby laser power supply. Zero voltage switching(ZVS) is implemented to minimize the switching loss by the LLC resonant converter. Laser output power is investigated and experimented by changing the output current. That current is controled by the charging voltage of capacitor. From those results, we obtained the maximum laser output of 1.94J at the discharge current of 860A and the pulse repetition rate of 1Hz.

Development of Medical Ruby Laser Power Supply using LLC Resonant Converter

Abstract: LLC resonant converter is used to control laser power density in ruby laser power supply. Zero voltage switching(ZVS) is implemented to minimize the switching loss by the LLC resonant converter. Laser output power is investigated and experimented by changing the output current. That current is controled by the charging voltage of capacitor. From those results, we obtained the maximum laser output of 1.94J at the discharge current of 860A and the pulse repetition rate of 1Hz.

Control system of all-solid-state pulser based on frequency doubling technology

Abstract: The invention discloses an all-solid-state pulse ultraviolet laser device based on the ruby laser frequency doubling technology. The all-solid-state pulse ultraviolet laser device is characterized by being composed of a laser input lens, a ruby crystal, one or more green light-emitting diode arrays, a Q switch, a laser frequency doubling crystal and a laser output lens. The laser input lens, the ruby crystal, the Q switch, the laser frequency doubling crystal and the laser output lens are sequentially arranged in space, the one or more green light-emitting diode arrays are arranged on the lateral sides of the ruby crystal, and the light-emitting directions of the one or more green light-emitting diode arrays are aligned with the lateral surfaces of the ruby crystal. The green light-emitting diode arrays are driven through pulses, the starting time of the Q switch is synchronously controlled, and pulse ultraviolet lasers which is 347 nm in wavelength can be periodically or aperiodically output according to requirements. The novel all-solid-state pulse ultraviolet laser device is mainly used for solving the problem that a low-multi-frequency all-solid-state pulse ultraviolet laser device is complex in structure, high in cost and low in long-term stability, is compact in structure and low in cost, has the good long-term stability, and is hopeful to replace traditional nitrogen laser devices in various kinds of mass spectrometers.

Из истории создания лазеров

Abstract: The history of the development of principles and methods of terminology systems in the Mordovian languages as well as the analysis of materials of language scientific conferences of the XX century and research works devoted to the development of terminology of the Moksha and Erzya literature languages are presented in the article.

The structure and photoconductivity of SiGe/Si epitaxial layers modified by single-pulse laser radiation

Abstract: The effect of nanosecond pulses of ruby laser radiation on the structural state and morphology of the epitaxial layers of a SiO0.5Ge0.5 solid solution on silicon with the initiation of a crystal-melt phase transition has been studied by electron microscopy. Data on the photoelectric parameters of the laser-modified layers having a cellular structure owing to the segregation of germanium during the solidification of the binary melt have been derived.

Laser Hair Removal

Abstract: Laser hair removal is one of the most common non-surgical procedures performed in the United States. Excessive, unwanted hair can be seen in all ages, ethnicities and skin types and lasers can help provide a permanent reduction in hair growth. Professional and home-based laser and light systems are both currently available, with professional systems including the 694 nm ruby laser, 755 nm Alexandrite laser, the 800 nm diode laser, the long-pulsed 1,064 nm Neodymium doped: yttrium aluminum garnet (Nd:YAG) laser, intense pulsed light (IPL), and radiofrequency. While generally safe, side effects from laser hair removal are possible and should only be used by trained medical professionals after performing a thorough history and physical examination. This chapter will provide a succinct approach to laser hair removal, including but not limited to available modalities, patient selection, reported side effects and management of care.

Lasers and Electro-optics: An introduction to two practical laser systems

Abstract: Introduction To give a little more practical emphasis to some of the ideas we have dealt with so far, let us consider some of the details of the two laser systems in which population inversion and laser oscillation were first demonstrated One of these lasers uses an amplifying medium that is a crystalline solid – the ruby laser; in the other the amplifying medium is a gas – a mixture of helium and neon In each case, the amplifying medium is pumped into a state of population inversion by feeding energy into it in an appropriate way Laser oscillation occurs when the amplifying medium is placed between a pair of suitable aligned mirrors that provide the necessary optical feedback to cause oscillation to occur The ruby laser was the first operational laser, being demonstrated on May 16, 1960 by Theodore Maiman of the Hughes Aircraft Company in Malibu, California [1] That the ruby laser was the first laser to be demonstrated surprised many in the scientific community This is because the ruby laser is a three-level laser, which was expected to be much more difficult to operate than a four-level laser This is an important distinction, which we will examine before describing the first two lasers in detail Three- and four-level lasers The distinction between three- and four-level lasers can be illustrtated with the aid of Fig 32 Energy is fed into the system to move particles from the ground state, level 0, to a pumping energy level, level 3