2017 Short Courses

Laser Congress Short Courses
Sunday, 1 October 2017
14:00 - 17:00 (2:00 p.m. – 5:00 p.m.) 

Short Courses cover a broad range of topic areas at a variety of educational levels and taught by highly regarded industry experts. Enhance your meeting experience with this excellent opportunity to learn about new products and cutting-edge technology.

Short Courses are complimentary for Laser Congress attendees (registered as full technical or student). To ensure admittance to your preferred course register as soon as possible. Space is limited and the complimentary seats will sell out.  To request a Certificate of Attendance after the conference, please email cstech@osa.org with your name, the course name, conference name, and year.

SC457- Ion-doped laser materials and saturable absorbers: basic spectroscopic properties and relevant parameters

SC458 - Fundamentals of Coherent and Incoherent Beam Combining

 

SC457 - Ion-doped laser materials and saturable absorbers: basic spectroscopic properties and relevant parameters
richard-Moncorge.jpgRichard Moncorgé, CIMAP CEA-CNRS-ENSICAEN Res. Lab, University of Caen, France

Course Level: Advanced Beginners  (Basics in atomic and laser physics are recommended)

Intended audience: The course is intended to researchers and engineers who aim at estimating the potential of new ion-doped materials and/or at determining the optimal operating conditions of a particular one for developing laser systems for specific applications.

Description: Description: More than fifty years after the operation of the first solid-state laser - a laser based on a flash-lamp pumped Cr3+-doped sapphire (ruby) crystal - optically-pumped transition-metal and rare-earth ion-doped materials still remain the basic active materials of most of the currently used and developed laser systems. The course will give a description of the basic spectroscopic properties and of the main operating parameters of these ion-doped materials used either as gain media or saturable absorbers for short-pulse lasers. The first part will be devoted to the description of the involved electronic configurations and energy levels, and of their positions within the bandgap of the host materials. It will also focus on the characteristics of the optical transitions, their band-shapes and intensities, the emission lifetimes and emission quantum yields, depending on the active ions, their local site symmetry, and the operating temperature. It will be shown how these characteristics can be exploited to derive key parameters like radiative and non-radiative emission rates, branching ratios as well as inter-state up and down transition cross sections. It will be also shown how inter-configurational and charge transfer transitions can be involved to account for some pump-induced pseudo-nonlinear effects. The second part will concentrate on how all this applies in the case of the main gain media and saturable absorbers, those which are currently used as well as those which could be worth to be (re-) examined in the future.  

Learning Objectives:

This course will give the participants the main tools for characterizing or analyzing the spectroscopic properties, for estimating the best operating conditions and simulating the performance of any ion-doped materials depending on internal and external conditions like the dopant concentration, the working temperature and the excitation pump wavelength and pump power.

About the Instructor: Richard Moncorgé is Emeritus Professor at the University of Caen in France. He received the Doctorat degree in Atomic and Molecular Physics from the University of Lyon in 1976 and the Doctorat es Sciences Physiques degree in 1982.  He was with the Centre National de la Recherche Scientifique (CNRS) as a researcher of the Laboratoire de Physico-Chimie des Matériaux Luminescents (LPCML), University of Lyon, from 1976 to 1993, and as a research Director from 1993 to 1997. During that period, he also worked as a Post-Doctoral scientist with the Department of Physics, Boston College, and with the University of California, Los Angeles, between 1976 and 1977, and as a scientific advisor in charge of a research program on new solid-state laser materials at the Centre National des Télécommunications (CNET), Paris, France, between 1982 and 1983. He moved then to the University of Caen where he created and headed the group “Matériaux et Instrumentation laser” of the CIMAP laboratory and was conducting researches in the field of laser materials. He was General, Program, Steering-Committee or Committee Chair of many national and international conferences and was recently nominated as Fellow of the EOS and of the OSA for theoretical and experimental contributions in the fields of linear and nonlinear optical spectroscopy of ions in solids and of solid-state lasers based on crystals doped with rare-earth and transition-metal ions. He was a Topical Editor of the J. Opt. Soc. Am. B for the “Luminescent Compounds and Processes and the Laser Materials” and he is now an Editorial Advisor of the French Scientific & Technical review “Techniques pour l’Ingénieur” more particularly in charge of the Optical Materials in general. He is an author or a co-author of more than 300 articles in scientific journals with referees’ reports and as invited papers or contributions to special issues and books.

 
 
SC458 - Fundamentals of Coherent and Incoherent Beam Combining
 
James-Leger.jpgJames Leger, Dept. of Electrical and Computer Engineering, Univ. of Minnesota Twin Cities, USA


Course Level: Advanced Beginner
 
Intended Audience: 
This course is designed to provide laser engineers, optical system designers, and technical management professionals with a working knowledge of laser beam combining techniques and methods.  Physical explanations of most topics are designed to make the concepts accessible to a wide range of students.
 
Description: 
The performance of conventional high power lasers is often compromised by one or more physical effects, limiting the maximum single-spatial-mode power that can be obtained from a single lasing element.  To increase the radiance from these individual elements, laser beam combining can be employed to convert the outputs from several lower-power modules into a single, high-power beam.  This short course establishes general beam combining principles relevant to all laser systems, reviews a variety of incoherent and coherent laser architectures, and establishes metrics and design rules for achieving optimal beam combining performance.
 
The practicing engineer and technical manager will be introduced to a wide variety of beam combining methods.   Attendees will be shown the theoretical limits of incoherent beam combining, and will explore design methods to achieve maximum radiance.  Practical issues of spectral and polarization beam combining will be discussed, with specific system architectures described to manage these issues.  Coherent spatial beam combining is introduced by exploring methods of establishing mutual coherence across laser arrays, including both maser-oscillator-parallel-amplifier architectures and coupled resonators.  The properties and characteristics of these coherent techniques are quantitatively analyzed using simple mathematical methods.  Temporal beam combining methods and architectures are applied to pulsed laser systems.  Finally, we investigate methods of converting spatial arrays of coherent beams into a single beam, and develop analytical tools to quantify the sensitivity of these approaches to beam shape and path length errors.
 
Learning Objectives: .
This course will enable participants to:
•   Describe the physical limits of incoherent and coherent beam combining
•   Evaluate the merits of specific incoherent and coherent beam combining approaches
•   Predict the performance of a specific system using simple quantitative tools
•   Design optics to optimize laser power delivered to a target at a distance
•   Explain coupled laser resonator architectures with a simple modal theory
•   Evaluate methods for active coherent beam combining phase control
•   Determine the effects of phase errors and beam shape on optical performance
•   Identify appropriate spatial beam shaping method for a particular application

About the Instructor: 
Prof. James Leger has worked in the area of laser beam combining for over 30 years, and is responsible for several foundational methods currently in use.  He is a Fellow of the OSA, Fellow of the IEEE, Fellow of the SPIE, and has been inducted into the Academy of Distinguished Teachers for his instructional abilities.