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Author: Walter Koechner Publisher: Springer Science & Business Media ISBN: 0387217657 Category : Science Languages : en Pages : 420
Book Description
Koechner's well-known ‘bible’ on solid-state laser engineering is now available in an accessible format at the graduate level. Numerous exercises with hints for solution, new text and updated material where needed make this text very accessible.
Author: Tanant Waritanant Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This work proposed to study Neodymium-doped laser crystals as an alternative for ultrashort pulse generation with medium output power level and high efficiency. The first section of this thesis focused on the thermal effect which is the main limitation in power scaling. The results showed that the thermal lensing effect is significantly reduced with in-band pumping at 914 nm. Aside from thermal lens effect investigation, discrete wavelength tuning and dual-wavelength operations were demonstrated with intracavity birefringent plates. Mode locking operations with SESAM as saturable absorber was demonstrated under 914 nm pump wavelength for the first time with the highest efficiency to date. The output in mode-locked regime was stable and self-starting with 16 ps pulse duration which can be extended to adjacent emission lines at 1073 nm and 1085 nm. Finally, two important candidates for low quantum defect pumping, Nd:CALYO and Nd:SYSO, were identified and tested for the first time.
Author: Walter Koechner Publisher: Springer Science & Business Media ISBN: 0387217657 Category : Science Languages : en Pages : 420
Book Description
Koechner's well-known ‘bible’ on solid-state laser engineering is now available in an accessible format at the graduate level. Numerous exercises with hints for solution, new text and updated material where needed make this text very accessible.
Author: Richard Scheps Publisher: SPIE-International Society for Optical Engineering ISBN: Category : Technology & Engineering Languages : en Pages : 122
Book Description
This text covers a wide range of material, from the basics of laser resonators to advanced topics in laser diode pumping. The subject matter is presented in descriptive terms that are understandable by the technical professional who does not have a strong foundation in fundamental laser topics.
Author: Dan C. Dumitras Publisher: IntechOpen ISBN: 9789535101055 Category : Technology & Engineering Languages : en Pages : 330
Book Description
Discovered almost fifty years ago at Bell Labs (1964), the Nd:YAG laser has undergone an enormous evolution in the years, being now widely used in both basic research and technological applications. Nd:YAG Laser covers a wide range of topics, from new systems (diode pumping, short pulse generation) and components (a new semiorganic nonlinear crystal) to applications in material processing (coating, welding, polishing, drilling, processing of metallic thin films), medicine (treatment, drug administration) and other various fields (semiconductor nanotechnology, plasma spectroscopy, laser induced breakdown spectroscopy).
Author: Helena Jelínková Publisher: Elsevier ISBN: 0857097547 Category : Technology & Engineering Languages : en Pages : 827
Book Description
Lasers have a wide and growing range of applications in medicine. Lasers for Medical Applications summarises the wealth of recent research on the principles, technologies and application of lasers in diagnostics, therapy and surgery.Part one gives an overview of the use of lasers in medicine, key principles of lasers and radiation interactions with tissue. To understand the wide diversity and therefore the large possible choice of these devices for a specific diagnosis or treatment, the respective types of the laser (solid state, gas, dye, and semiconductor) are reviewed in part two. Part three describes diagnostic laser methods, for example optical coherence tomography, spectroscopy, optical biopsy, and time-resolved fluorescence polarization spectroscopy. Those methods help doctors to refine the scope of involvement of the particular body part or, for example, to specify the extent of a tumor. Part four concentrates on the therapeutic applications of laser radiation in particular branches of medicine, including ophthalmology, dermatology, cardiology, urology, gynecology, otorhinolaryngology (ORL), neurology, dentistry, orthopaedic surgery and cancer therapy, as well as laser coatings of implants. The final chapter includes the safety precautions with which the staff working with laser instruments must be familiar.With its distinguished editor and international team of contributors, this important book summarizes international achievements in the field of laser applications in medicine in the past 50 years. It provides a valuable contribution to laser medicine by outstanding experts in medicine and engineering. - Describes the interaction of laser light with tissue - Reviews every type of laser used in medicine: solid state, gas, dye and semiconductor - Describes the use of lasers for diagnostics
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A mode-locked laser employs a coupled-polarization scheme for efficient longitudinal pumping by reshaped laser diode bars. One or more dielectric polarizers are configured to reflect a pumping wavelength having a first polarization and to reflect a lasing wavelength having a second polarization. An asymmetric cavity provides relatively large beam spot sizes in gain medium to permit efficient coupling to a volume pumped by a laser diode bar. The cavity can include a collimation region with a controlled beam spot size for insertion of a saturable absorber and dispersion components. Beam spot size is selected to provide stable mode locking based on Kerr lensing. Pulse durations of less than 100 fs can be achieved in Yb:KGW.
Author: Akio Ikesue Publisher: Cambridge University Press ISBN: 110724417X Category : Science Languages : en Pages : 459
Book Description
Until recently, ceramic materials were considered unsuitable for optics due to the numerous scattering sources, such as grain boundaries and residual pores. However, in the 1990s the technology to generate a coherent beam from ceramic materials was developed, and a highly efficient laser oscillation was realized. In the future, the technology derived from the development of the ceramic laser could be used to develop new functional passive and active optics. Co-authored by one of the pioneers of this field, the book describes the fabrication technology and theoretical characterization of ceramic material properties. It describes novel types of solid lasers and other optics using ceramic materials to demonstrate the application of ceramic gain media in the generation of coherent beams and light amplification. This is an invaluable guide for physicists, materials scientists and engineers working on laser ceramics.
Author: Alphan Sennaroglu Publisher: CRC Press ISBN: 135183794X Category : Technology & Engineering Languages : en Pages : 674
Book Description
Because of the favorable characteristics of solid-state lasers, they have become the preferred candidates for a wide range of applications in science and technology, including spectroscopy, atmospheric monitoring, micromachining, and precision metrology. Presenting the most recent developments in the field, Solid-State Lasers and Applications focuses on the design and applications of solid-state laser systems. With contributions from leading international experts, the book explores the latest research results and applications of solid-state lasers as well as various laser systems. The beginning chapters discuss current developments and applications of new solid-state gain media in different wavelength regions, including cerium-doped lasers in the ultraviolet range, ytterbium lasers near 1μm, rare-earth ion-doped lasers in the eye-safe region, and tunable Cr2+:ZnSe lasers in the mid-infrared range. The remaining chapters study specific modes of operation of solid-state laser systems, such as pulsed microchip lasers, high-power neodymium lasers, ultrafast solid-state lasers, amplification of femtosecond pulses with optical parametric amplifiers, and noise characteristics of solid-state lasers. Solid-State Lasers and Applications covers the most important aspects of the field to provide current, comprehensive coverage of solid-state lasers.
Author: Louis McDonagh Publisher: Cuvillier Verlag ISBN: 3736930283 Category : Science Languages : en Pages : 180
Book Description
For the last decade, neodymium-doped orthovanadate has established itself as the active material of choice for commercial solid-state lasers emitting in the 1 µm range, with output powers from several hundred milliwatts to a few tens of watts, in continuous-wave, short nanosecond Q-switched, or picosecond modelocked pulsed regimes. Its main advantages over other Nd-doped hosts such as YAG are a large stimulated-emission cross section leading to a high gain, a strong pump absorption allowing the efficient mode-matching of tightly-focused pump light, and a natural birefringence resulting in a continuously polarized output. The main drawbacks, however, are rather poor mechanical characteristics and strong thermal lensing, effectively limiting the maximum applicable pump power before excessively strong and aberrated thermal lensing prevents an efficient operation in a diffraction-limited beam, and ultimately the crystal’s fracture. Put aside the power limitation, the association of vanadate with diode end pumping allows for the realization of highly efficient and reliable laser sources based on well-known technologies, which provides an advantage in terms of manufacturability and cost-effectiveness over other high-potential technologies such as disks and fibers. This thesis introduces a novel pumping technique for Nd:YVO4 that allows for the realization of significantly higher-power laser sources with a high optical-to-optical efficiency and diffraction-limited beam quality, while keeping the benefits of a well-established technology. It consists in pumping at a wavelength of 888 nm instead of the classic 808 nm, providing a low and isotropic absorption, which results in a smooth distribution of the absorbed pump light in long crystals, effectively limiting the deleterious effects of high inversion density such as crystal end-facet bulging, high crystal temperature, aberrated thermal lensing, and upconversion. After presenting vanadate’s spectroscopic and physical characteristics, a complete analysis of the heatgenerating effects is performed, allowing for side-by-side simulations of the thermal effects in practical 808 nm and 888 nm pumped systems, and for an evaluation of their respective thermal lensing behaviors. Continuous-wave operation was thoroughly investigated, first in a multi-transversal mode oscillator to assess the maximum optical efficiency with optimum pump-mode matching and the thermal lensing characteristics. A TEM00 resonator was then developed with a single crystal and one pump diode, providing 60 W of output power with an optical efficiency of 55% and a beam quality of M2 = 1.05. This resonator was symmetrically replicated to form a periodic resonator, providing 120 W of output with the same optical efficiency and beam quality. This two-crystal configuration was then modified to an oscillator-amplifier configuration, providing a single-pass extraction efficiency of 53% and a total oscillator-amplifier output of 117 W without any beam-quality degradation. Intracavity doubling of the one and two-crystal configurations was achieved by inserting a non-critically phase-matched LiB5O3 (LBO) non-linear crystal in the resonator, providing up to 62 W of diffraction-limited green light at 532 nm with low-noise characteristics thanks to a large number of oscillating modes, thus limiting the effects of the “green problem”. A strong industrial interest resides in Q-switched lasers emitting nanosecond pulses, particularly with a high average power, high pulse repetition rate, and pulse durations of a few to several tens of nanoseconds. Achieving high-frequency and short-pulse operation both require a high gain, which explains the domination of Nd:YVO4 over lower-gain materials such as Nd:YAG or Yb:YAG. Thus, an acousto-optically Q-switched oscillator was demonstrated with 50 W output power and 28 ns pulse duration at 50 kHz. Pulse duration, however, is inversely proportional to the pulse energy, so that an increase in repetition rate inevitably results in an almost linear increase in pulse width. A cavity-dumped Q-switched oscillator was built to circumvent this limitation, the pulse length being defined by the cavity roundtrip time and the electro-optic cell switching time. It provided a constant pulse duration of 6 ns up to a repetition rate of 100 kHz and a maximum output power of 47 W. Such short pulse durations are normally available with output powers of a few watts from Q-switched lasers, and conversely Q-switched lasers of similarly high output power deliver pulses of several tens to over 100 ns in duration. There exists another strong interest in high average power quasi-cw picosecond sources, which allow for the efficient generation of green and UV radiation, or even red-green-blue for laser video projection. Passive mode locking with a semiconductor saturable absorber mirror (SESAM) is the preferred technique employed for the stable and self-starting generation of picosecond pulse trains, yet a high gain is necessary for achieving high repetition rates while avoiding the Q-switched mode-locking regime. Thus SESAM mode locking was applied to an 888 nm pumped oscillator, achieving 57 W of output power at a repetition-rate of 110 MHz and a pulse duration of 33 ps. Its output was efficiently amplified in a single pass up to 111 W without any beam quality, temporal, or spectral degradation. The high peak power of 30 kW allowed for the generation of 87 W of second harmonic at 532 nm with an efficiency of 80%, and 35 W of 355 nm third harmonic with a conversion efficiency of 33% in LBO crystals. The wide range of high-power systems demonstrated in this work illustrate the benefits of the optimized pumping of Nd:YVO4 at 888 nm, maintaining its highly-desirable characteristics such as a high gain and a polarized output while extending its power capabilities far beyond regular 808 nm pumped systems. This improvement should allow Nd:YVO4 systems to compete with high-power technologies such as disks and fibers, which often struggle in the generation of short pulses because of their low gain and strong non-linear effects, respectively.
Author: Walter Koechner
Author: Tanant Waritanant
Author: Walter Koechner
Author: Jeffrey Allen Morris
Author: Richard Scheps
Author: Dan C. Dumitras
Author: Helena Jelínková
Author: 
Author: Akio Ikesue
Author: Alphan Sennaroglu
Author: Louis McDonagh