For these reasons, many researchers choose to use pulsed lasers even when CW lasers might appear to be preferable. Then, after the pump energy stored in the laser medium has approached the maximum possible level, the introduced loss mechanism (often an electro- or acousto-optical element) is rapidly removed (or that occurs by itself in a passive device), allowing lasing to begin which rapidly obtains the stored energy in the gain medium.

Therefore in applications demanding the smoothest power distribution or fine spectrum content the semiconductor lasers cannot yet compete with the traditional laser systems.The pulsed laser diodes are available, but the pulse energy, pulse duration and peak power are much lower than those of solid state or dye lasers. ScienceDirect ® is a registered trademark of Elsevier B.V.URL: https://www.sciencedirect.com/science/article/pii/S0076695X08606158URL: https://www.sciencedirect.com/science/article/pii/B9780444521262500277URL: https://www.sciencedirect.com/science/article/pii/B9780080445045500428URL: https://www.sciencedirect.com/science/article/pii/B9780123562500500087URL: https://www.sciencedirect.com/science/article/pii/B9780444869043500749URL: https://www.sciencedirect.com/science/article/pii/B9780444869043500774URL: https://www.sciencedirect.com/science/article/pii/B9780125139106500086URL: https://www.sciencedirect.com/science/article/pii/B9780444513229500348URL: https://www.sciencedirect.com/science/article/pii/B9780122519307500297URL: https://www.sciencedirect.com/science/article/pii/B9780128165058000175Atomic, Molecular, and Optical Physics: Electromagnetic RadiationLASER ABLATION PROCESSING OF SOLID SURFACES IMMERSED IN WATERNovel Materials Processing by Advanced Electromagnetic Energy SourcesPICOSECOND OBSERVATIONS OF MOLECULAR PROCESSES USING LASER TECHNIQUESEXPERIMENTS AND SIMULATION ON LASER-DRIVEN SHOCK WAVE EVOLUTION IN ALUMINUM TARGETSHigh-resolution Pulsed Laser Spectroscopy in the UV/VUV Spectral RegionHybrid nanocomposites for imaging-guided synergistic theranosticsScienceDirect ® is a registered trademark of Elsevier B.V. à l'aide d'un faisceau laser pulsé à balayage. Starting from the temperature field for the homogeneous temperature distribution, the time-dependent source described will correspond with the pulsed laser systems. Originally the emission wavelengths were in the near infrared region, but recently new structures were developed, e. g. GaAs, GaP, AlGaAs and InP, which can operate in the visible wavelength range. Pulsed lasers are also easier to build, because the high gain of the laser medium that is typical of pulsed lasers means that intracavity laser optics can be of relatively low optical quality and lossy. excimer laser A gas laser that emits pulses of light in the ultraviolet region (at 193 nm). Traductions en contexte de "pulsed laser beam" en anglais-français avec Reverso Context : The active semiconductor film is irradiated with a pulsed laser … This encompasses a wide range of technologies addressing a number of different motivations.

They are successfully replacing traditional pumping sources such as arc lamps in modern solid state laser systems. Déverrouiller. At present, pulsed lasers are widely used in areas ranging from atomic and molecular spectroscopy to remote sensing, from fiberoptic communications to laser medicine.Semiconductor light emitting diodes and laser diodes were under active development during few past decades. Les exemples vous aident à traduire … The way to overcome this problem was to charge up large Contenu potentiellement inapproprié. In this laser a ruby crystal (chromium-doped sapphire) served as the gain medium, which was excited by light from a pulsed flashlamp that surrounded the crystal.

The generated ultrasonic waves can be detected to form ultrasonic images.

The pressures produced by the laser plasma have been measured with piezoresistive carbon gages, In the work reported here, a new piezoresistive gage package design was used to measure surface pressure histories for short laser pulses. Pulsed pumping was historically used with dye lasers where the inverted population lifetime of a dye molecule was so short that a high energy, fast pump was needed. Many papers have been published to date on the applications of the Q-switched laser in the study of nanosecond chemical processes.More recently, the mode-locked laser was developed,When an intense pulsed laser beam strikes a target in air, a traveling zone of ionized gas is formed that travels up the laser beam toward the laser. The LSD leaves behind a zone of plasma that exerts a pressure on the target as it subsequently expands. This can be realized by making the power These lasers arc not tunable but most of them can emit several lines which in many cases may be selected from a single apparatus.This chapter focuses on high-resolution pulsed laser spectroscopy in the UV/VUV spectral region. However, a series of pulsed laser diodes were developed for application in time correlated single photon counting method (see Pulsed laser irradiation of a solid target immersed in liquid gives smooth and clear-cut surface profiles compared with those obtained in air atmosphere (On the other hand, thermodynamic properties of the ablation plume, which is produced immediately above the irradiation spot of the target in water, have been studied by the authors group (In the present work we compared the shape of the hole and the removal rate of the laser etching for several target materials. Smith and Turner utilized a ruby laser to deposit the first thin films in 1965, three years after Breech and Cross studied the laser-vaporiza… Thus, such inexpensive optics as aluminized mirrors, uncoated lenses, and polarizers are usable in the construction of pulsed lasers. Two … By continuing you agree to the Copyright © 2020 Elsevier B.V. or its licensors or contributors. The pulsed laser source may reduce and/or eliminate cross-influence artifacts in images resulting from pulsed radiation image acquisition. Pulsed operation of lasers refers to any laser not classified as continuous wave, so that the optical power appears in pulses of some duration at some repetition rate.

The gage package is designed to minimize the effects of internal wave reflections and off-axis stresses.