Steven Johnson: Catalogue data in Autumn Semester 2021 
Name  Prof. Dr. Steven Johnson 
Field  Physics 
Address  Institut für Quantenelektronik ETH Zürich, HPT D 15 AugustePiccardHof 1 8093 Zürich SWITZERLAND 
Telephone  +41 44 633 76 31 
Fax  +41 44 633 10 54 
johnsons@ethz.ch  
URL  https://udg.ethz.ch 
Department  Physics 
Relationship  Full Professor 
Number  Title  ECTS  Hours  Lecturers  

402002301L  Physics  7 credits  5V + 2U  S. Johnson  
Abstract  This course gives an overview of important concepts in classical dynamics, thermodynamics, electromagnetism, quantum physics, atomic physics, and special relativity. Emphasis is placed on demonstrating key phenomena using experiments, and in developing skills for quantitative problem solving.  
Objective  The goal of this course is to make students able to explain and apply the basic principles and methodology of physics to problems of interest in modern science and engineering. An important component of this is learning how to solve new, complex problems by breaking them down into parts and applying simplifications. A secondary goal is to provide to students an overview of important subjects in both classical and modern physics.  
Content  Electrodynamics, Thermodynamics, Quantum physics, Waves and Oscillations, special relativity  
Lecture notes  Lecture notes and exercise sheets will be distributed via Moodle  
Literature  P.A. Tipler and G. Mosca, Physics for scientists and engineers, W.H. Freeman and Company, New York  
Competencies 
 
402040200L  Ultrafast Laser Physics  10 credits  3V + 2U  L. P. Gallmann, S. Johnson, U. Keller  
Abstract  Introduction to ultrafast laser physics with an outlook into cutting edge research topics such as attosecond science and coherent ultrafast sources from THz to Xrays.  
Objective  Understanding of basic physics and technology for pursuing research in ultrafast laser science. How are ultrashort laser pulses generated, how do they interact with matter, how can we measure these shortest manmade events and how can we use them to timeresolve ultrafast processes in nature? Fundamental concepts and techniques will be linked to a selection of hot topics in current research and applications.  
Content  The lecture covers the following topics: a) Linear pulse propagation: mathematical description of pulses and their propagation in linear optical systems, effect of dispersion on ultrashort pulses, concepts of pulse carrier and envelope, timebandwidth product b) Dispersion compensation: technologies for controlling dispersion, pulse shaping, measurement of dispersion c) Nonlinear pulse propagation: intensitydependent refractive index (Kerr effect), selfphase modulation, nonlinear pulse compression, selffocusing, filamentation, nonlinear Schrödinger equation, solitons, noninstantaneous nonlinear effects (Raman/Brillouin), selfsteepening, saturable gain and absorption d) Secondorder nonlinearities with ultrashort pulses: phasematching with short pulses and real beams, quasiphase matching, secondharmonic and sumfrequency generation, parametric amplification and generation e) Relaxation oscillations: dynamical behavior of rate equations after perturbation f) Qswitching: active Qswitching and its theory based on rate equations, active Qswitching technologies, passive Qswitching and theory g) Active modelocking: introduction to modelocking, frequency comb versus axial modes, theory for various regimes of laser operation, Haus master equation formalism h) Passive modelocking: slow, fast and ideally fast saturable absorbers, semiconductor saturable absorber mirror (SESAM), designs of and materials for SESAMs, modelocking with slow absorber and dynamic gain saturation, modelocking with ideally fast saturable absorber, Kerrlens modelocking, soliton modelocking, Qswitching instabilities in modelocked lasers, inverse saturable absorption i) Pulse duration measurements: rf cables and electronics, fast photodiodes, linear system theory for microwave test systems, intensity and interferometric autocorrelations and their limitations, frequencyresolved optical gating, spectral phase interferometry for direct electricfield reconstruction and more j) Noise: microwave spectrum analyzer as laser diagnostics, amplitude noise and timing jitter of ultrafast lasers, lockin detection k) Ultrafast measurements: pumpprobe scheme, transient absorption/differential transmission spectroscopy, fourwave mixing, optical gating and more l) Frequency combs and carrierenvelope offset phase: measurement and stabilization of carrierenvelope offset phase (CEP), time and frequency domain applications of CEPstabilized sources m) Highharmonic generation and attosecond science: nonperturbative nonlinear optics / strongfield phenomena, highharmonic generation (HHG), phasematching in HHG, attosecond pulse generation, attosecond technology: detectors and diagnostics, attosecond metrology (streaking, RABBITT, transient absorption, attoclock), example experiments n) Ultrafast THz science: generation and detection, physics in THz domain, weakfield and strongfield applications o) Brief introduction to other hot topics: relativistic and ultrahigh intensity ultrafast science, ultrafast electron sources, freeelectron lasers, etc.  
Lecture notes  Class notes will be made available.  
Prerequisites / Notice  Prerequisites: Basic knowledge of quantum electronics (e. g., 402027500L Quantenelektronik).  
Competencies 
 
4060023AAL  Physics Enrolment ONLY for MSc students with a decree declaring this course unit as an additional admission requirement. Any other students (e.g. incoming exchange students, doctoral students) CANNOT enrol for this course unit.  7 credits  15R  S. Johnson  
Abstract  This course gives an overview of important concepts in classical dynamics, thermodynamics, electromagnetism, quantum physics, and special relativity. Emphasis is placed on demonstrating key phenomena using experiments, and in developing skills for quantitative problem solving.  
Objective  The goal of this course is to make students able to explain and apply the basic principles and methodology of physics to problems of interest in modern science and engineering. An important component of this is learning how to solve new, complex problems by breaking them down into parts and applying approximations.  
Content  Oscillations and waves in matter Thermodynamics (temperature, heat, equations of state, laws of thermodynamics, entropy, transport) Electromagnetism (electrostatics, magnetostatics, curcuits, Maxwell's equations, electromagnetic waves, induction, electromagnetic properties of materials) Overview of quantum and atomic physics Introduction to special relativity  
Lecture notes  Lecture notes and exercise sheets will be distributed via Moodle.  
Literature  P.A. Tipler and G. Mosca, Physics for scientists and engineers, W.H. Freeman and Company, New York  
Competencies 
