The Photonics Spotlight
The Photonics Spotlight – associated with the Encyclopedia of Laser Physics and Technology – is a “blog” (web log) with the purpose of highlighting interesting news and useful information in the area of photonics, particularly laser technology and applications.
The content can be related to particularly interesting scientific papers or to other forms of publications, reporting for example cute new techniques, special achievements, or useful hints.
Note that the Spotlight articles (as well as those of the Encyclopedia) are citable.
Permanent links are given for each article.
This blog is operated by Dr. Rüdiger Paschotta of RP Photonics Consulting.
Comments and suggestions are welcome.
The news items are definitely not available for advertising, but advertisers can order banners on the right column of this page.
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And here are the articles:
2016-05-12: Measurement of Absorption Spectra of Active Fibers: Not as Easy as One Might Think!
2016-04-04: Photographs, Drawings and Videos for the Encyclopedia of Laser Physics and Technology
2016-02-26: New Encyclopedia Articles
2016-01-27: Finding Suppliers for Photonics Products
2015-11-28: How to Store Light – and to Understand the Laser Principle
2015-10-17: The Linewidth of Single-frequency Lasers
2015-09-24: Q-switched Lasers: Nd:YVO4 Better Suited than Nd:YAG for High Pulse Repetition Rates
2015-08-08: Gain Saturation with Pulses
2015-07-01: Self-phase Modulation Causes Spectral Broadening – Does it Really?
2015-05-14: Alignment Sensitivity of Laser Resonators – an Important Design Criterion
2015-04-10: The Enormous Popularity of the RP Photonics Website
2015-03-11: Strange Time Dependence of ASE from a Fiber Amplifier
2015-02-05: Attenuating Laser Beams – not That Easy
2015-01-09: New Tutorial: Modeling of Fiber Amplifiers and Lasers
2014-12-17: How PhD Students Should Get Supported by Supervisors
2014-11-14: Correctly Designing Frequency Conversion Stages: Not Easy, but Worthwhile!
2014-10-03: Fiber Optics Tutorials
2014-07-28: How to Define the Mode Radius of a Fiber?
2014-06-27: Shortages of Rare Earth Materials – a Problem for Photonics?
2014-05-16: 10-Year Anniversary of RP Photonics
2014-04-02: Lower Emission Cross-section Leads to Higher Pulse Energy?!?
2014-01-17: Mediation in Disputes on Laser Technology
2013-12-13: Avoiding Trouble with Laser Specifications
2013-11-12: Beam Quality Limit for Multimode Fibers
2013-09-24: Simulation of a Q-switched Nd:YAG Laser:
Numerical Beam Propagation Reveals What Happens, Analytical Reasoning Explains It
2013-08-26: Frequency Doubling and the Reverse Process
2013-07-08: Amplified Spontaneous Emission in Fiber Amplifiers
2013-06-13: Two New Photonics Newsletters
2012-08-06: The New RP Photonics Buyer's Guide
2012-03-12: New Raman Lasers
2012-03-03: Conflicting Definitions of s and p Polarization
2012-02-03: Simulation Software: Use Commercial Products or Home-Made Software?
2011-12-23: Kerr-lens Mode-locked Thin-disk Laser
2011-06-10: Are Compact Resonators More Stable?
2011-05-28: Explanation for the Mode Instability in High-power Fiber Amplifiers with Few-mode Fibers
2011-03-13: What if Solid-State Laser Transitions Would Be Much Stronger?
2011-02-10: Fiber Lasers: More Difficult to Design than Bulk Lasers
2011-01-05: Femtosecond Fiber Amplifiers: Unlimited Peak Power?
2010-09-02: Why LEDs are Energy-efficient, and Why They Could Well Increase Energy Consumption
2010-07-27: Special SESAMs for Mode-locked High-power Lasers?
2010-07-12: Laser Development: Get an Expert Early on!
2010-06-09: Poor Man's Isolator
2010-05-14: Plagiarism, Exploiting the Encyclopedia of Laser Physics and Technology
2010-04-26: Resolution and Accuracy of Measurements
2010-04-16: Why Large Mode Area Waveguides Do Not Work for Laser Diodes
2010-04-08: Creating a Top-hat Laser Beam Focus
2010-03-22: All-in-one Concepts versus Modular Concepts
2010-03-15: Spatial Walk-off and Beam Quality in Nonlinear Frequency Conversion
2010-03-09: Nonlinearities in Fiber Amplifier Modeling
2010-03-03: Thresholds for Nonlinear Effects in Fiber Amplifiers
2010-02-26: New Scientific Paper: Timing Jitter and Phase Noise of Mode-locked Fiber Lasers
2010-02-06: Scientific Conferences and Publications: Emphasize Device Performance or Insight?
2010-01-29: Far From Maturity: The Photonics Industry
2010-01-22: Pumping Fiber Lasers with Fiber Lasers
2010-01-11: Beams of Laser Pointers: Visible in Air?
2009-12-31: Tilt Tuning of Etalons
2009-12-13: Johnson–Nyquist Noise in Photodiode Circuits
2009-12-08: Increased Output Power of a Laser with Forced Tuning
2009-11-22: The Beam Focus – Not Just a Demagnified Version of Your Beam
2009-11-18: Articles and a Quiz on Photonics Issues
2009-11-13: Photodetection: Optical and Electrical Powers
2009-11-03: Coherent Light from a Bulb?
2009-10-19: Risk Factors for Science Fraud and the Scientist's Responsibility
2009-10-12: Cold Light from the Hottest Bodies and from Cool Devices
2009-10-08: Nobel Prize for Charles K. Kao for Pioneering Work on Optical Fibers
2009-10-03: Peak Intensity of Gaussian Beam
2009-09-27: Lasers with Short Upper-state Lifetime
2009-09-19: Are Laser Resonators Power Scalable?
2009-09-07: Anniversary: 5 Years of the Encyclopedia of Laser Physics and Technology
2009-09-01: Fresnel Reflections from Double Interfaces
2009-08-22: Jitter and Phase Noise of Mode-locked Fiber Lasers
2009-08-14: Progress on Green Laser Diodes
2009-08-12: What is an Optical Transistor?
2009-07-29: No Beat Note for Orthogonal Modes
2009-07-23: Submit Photographs for the Encyclopedia of Laser Physics and Technology
2009-07-21: Signal-to-Noise Ratio and Measurement Bandwidth
2009-07-09: Gain-guiding Index-antiguiding Fibers
2009-06-29: Doing Things Properly: It's the Economy, Stupid!
2009-06-23: Coherence – a Black-or-White Issue?
2009-06-08: Prizes of the European Physical Society
2009-06-02: 5 Years of RP Photonics Consulting
2009-05-22: Interference Effects with Imbalanced Intensity Levels
2009-05-13: The Minimum Time–Bandwidth Product
2009-04-28: SPIE Field Guides
2009-04-19: Last Chance to Get the Encyclopedia of Laser Physics and Technology Cheaper
2009-04-17: Miniature Laser Projectors – The Next Big Laser Thing?
2009-04-06: Laser Pointers in Soccer Games: Not Necessarily Harmless
2009-04-05: Stability of Resonators – an Ambiguous Term
2009-03-19: Scientific Progress: not as Straight a Process as it Seems
2009-03-07: Complicated Pulse Shapes from Q-switched Fiber Lasers
2009-03-02: User Interfaces for Simulation Software
2009-02-13: Laser Beam Deflections: The Angle–Diameter Product
2009-01-12: Chaotic Lasing Generates Random Numbers
2009-01-05: Extremely Long Mode-locked Fiber Laser
2008-12-16: Why Fiber Amplifiers, not Fiber Lasers?
2008-11-25: The Gouy Phase Shift Speeds up Light
2008-11-08: Validating Numerical Simulation Software
2008-10-20: Rate Equations – An Example for Stiff Sets of Differential Equations
2008-10-03: Wavelength-Tunable Lasers: Does the Tuner Degrade the Power Efficiency?
2008-09-24: Decoupling Pulse Duration and Pulse Energy
2008-09-10: Unpolarized Single-Frequency Output
2008-08-28: Photographs for the Encyclopedia of Laser Physics and Technology
2008-08-15: Print Version of the Encyclopedia of Laser Physics and Technology
2008-07-26: Beat Signals with Zero Linewidth
2008-07-13: The Simplified History of the Michelson–Morley Experiment
2008-07-02: Stronger Focusing Avoids SESAM Damage
2008-06-20: All-in-One Ultrafast Laser Systems
2008-06-13: Heisenberg's Uncertainty Principle and the Transform Limit
2008-06-06: Fiber Lasers Which Are No Fiber Lasers
2008-05-25: Einstein and the Laser
2008-05-13: Easier Self-Starting Passive Mode Locking for Short Lasers
2008-05-05: Length of a Photon
2008-04-28: Different Kinds of Polarization
2008-04-22: Abused Photonics Terms: Coherence
2008-04-15: Abused Photonics Terms: Modes
2008-04-02: Solitons: Lower Dispersion, Stronger Dispersive Effects!
2008-03-26: Mode-Locked Lasers: Lower Average Powers in Shorter Pulses
2008-03-17: Ultrafast Fiber Lasers: Re-Inventing Mode Locking
2008-03-10: Automatic Phase Matching
2008-03-04: What is a “High” Laser Beam Quality?
2008-02-22: Launching Light from a Bulb into a Single-Mode Fiber
2008-02-14: How Laser Development Can Go Wrong
2008-02-12: Factor 2 in the Equation for Cross-Phase Modulation
2008-02-03: Quantifying the Chirp of Ultrashort Pulses
2008-01-27: Beam Quality in Second-Harmonic Generation
2008-01-14: Frequency Doubling: Long Pulses Cause Trouble
2008-01-06: Saturation Intensity or Saturation Fluence of a Saturable Absorber or a Laser Gain Medium: What Matters?
2007-12-18: The Role of Laser Safety Goggles
2007-12-11: The Idler Wave - Essential for Parametric Amplification and Oscillation
2007-12-03: New Paper on Power Scaling of Lasers
2007-11-26: Solving Laser Problems Step by Step
2007-11-19: Walk-Off and Phase-Matching Bandwidth in Nonlinear Crystals
2007-11-10: Retirement of Prof. David C. Hanna
2007-11-02: Ultrafast Laser Kills Viruses
2007-10-31: Thermal Equilibrium in Laser Crystals
2007-10-25: The Gain Bandwidth of Laser Crystals and Glasses
2007-10-17: Why the Second-Harmonic Beam is Smaller
2007-10-11: Understanding Fourier Spectra
2007-10-07: Effective Refractive Index: Correcting a Common Belief
2007-09-27: Light Plus Light = Darkness: No Energy Problem, but Quantum Weirdness
2007-09-21: Optimum Crystal Length for Frequency Doubling
2007-09-13: Using Figures of the Encyclopedia in Your Publications, and Citing the Encyclopedia
2007-09-07: Power Scaling in Downward Direction
2007-09-01: Stimulated Brillouin Scattering: Lower Peak Power, Stronger Effect?
2007-08-27: Distant Healing of Lasers
2007-08-23: An OPO Without Resonator Mirrors
2007-08-22: Saturation of Pump Absorption - An Important Issue?
2007-08-15: Light = Electromagnetic Waves?
2007-08-06: Fiber Amplifiers: More ASE for Larger Core with Higher NA?
2007-07-30: Fiber Amplifiers: Stronger ASE in Backward Direction
2007-07-25: Higher Heat Generation Density, Stronger Thermal Effects?
2007-07-16: Mode Competition - Increased or Decreased by Spatial Hole Burning?
2007-07-11: What is a Beam Width, Beam Size, and a Beam Waist?
2007-07-06: Promoting Dangerous Practices in Laser Labs
2007-07-01: Nonsensical Regulations Undermine Laser Safety
2007-06-24: The Plague of a Narrow Emission Linewidth
2007-06-11: Beam Quality Measurements Can Easily Go Wrong
2007-06-01: Characterize Your Pump Beam!
2007-05-26: Optical Isotropy: Nonlinear Interactions are Different!
2007-05-19: Why Strong Birefringence in Fibers Helps
2007-05-10: Fundamental Limitation for sigma-tau Product, Gain Efficiency, and Laser Threshold
2007-04-28: Easier Launching into Fibers with Large Mode Area?
2007-04-16: Questions and Answers on Shot Noise
2007-04-01: The Ideal Pump Intensity Distribution in an End-Pumped Solid-State Laser
2007-03-23: Explaining the Nature of Photons to Lay Persons
2007-03-16: Time To Market and the Economics of Laser Development - or How to Cause Great Financial Damage without Spending Money
2007-03-11: Divided-Pulse Amplification
2007-03-09: The Trouble with Crystal and Coating Damage
2007-03-05: More Efficient Frequency Doubling with Shorter Pulses?
2007-02-26: No Laser, no Result?
2007-02-22: Lossy Laser Cavities
2007-02-16: The Science of Biophotons
2007-02-09: Papers Reporting Yet Another Laser Crystal
2007-02-04: Continuing Struggle for Larger Fiber Mode Areas
2007-01-27: Noise Figure of Amplifiers
2007-01-21: Operation Far Above Threshold
2007-01-15: Origins of Heating in Laser Crystals
2007-01-09: The Myth of Fiber-Optic Polar Bears
2007-01-05: Why the Encyclopedia of Laser Physics and Technology is Successful
2006-12-31: Peak Position of an Optical Spectrum
2006-12-16: Dangerous Green Laser Pointers
2006-12-09: The Laser Industry - High Tech or Low Tech?
2006-12-03: Diffraction in Optical Fibers
2006-11-28: The Role of Diffraction in Optical Resonators
2006-11-21: The Resonator Mystery
2006-11-16: Laser Models - not Always Useful
2006-11-04: Nd:YVO4 Laser with Polarization-Independent Pump Absorption
2006-11-02: Reflection Spectrum of Tilted Dielectric Mirrors
2006-10-26: Residual Transmission Through Highly Reflecting Mirrors
2006-10-22: Lasers Attract Dust to Cavity Mirrors
2006-10-17: A Cute New Imaging Technique Named Compressive Imaging
2006-10-16: Using a Current Amplifier for Optical Power Measurements and Recording with a Photodiode
2006-10-15: Fivehundred Articles in the Encyclopedia of Laser Physics and Technology
2006-10-09: Correct Specifications for Laser Noise - Valuable but Hard to Obtain
2006-10-04: Higher-Order Modes of Fibers: a Solution for Single-Mode Guidance with Large Mode Area?
2006-10-01: Stability Zones of Laser Resonators
2006-09-29: Frequency Dependence of the Conversion Efficiency for Frequency Doubling
2006-09-22: Coherence Length of Ultrashort Pulses
2006-09-21: Power Scaling Limits of Optical Parametric Amplifiers
2006-09-16: Q-switched Lasers: YAG versus Vanadate
2006-09-06: Quenching Degrades the Efficiency of Some Ytterbium-Doped Gain Media
2006-09-03: Single-Frequency Operation Stabilized by Spatial Hole Burning
2006-09-03: Resolution of Conundrum: Threshold Power for Parametric Nonlinear Interactions
2006-09-01: Test Yourself with the Photonics Quiz
2006-08-23: Lasers with Nonlinear Input-Output Characteristics
2006-08-20: Lower Noise from Longer Lasers
2006-08-18: Resolution of Conundrum: No Magnetic Field on the Axis of a Coil
2006-08-15: The Effect of a Double Pass in a Frequency Doubler
2006-08-12: Understanding Quasi-Three-Level Lasers
2006-08-10: Single-Mode Fibers with Large Mode Areas
2006-08-01: Lasers Disturbed by Vacuum?
2006-07-30: Threshold Power for Parametric Nonlinear Interactions
2006-07-24: Beam Distortions in Laser Cavities
2006-07-23: Single-Atom Lasers
2006-07-22: No Magnetic Field on the Axis of a Coil?
2006-07-21: Photonics and Laser Technology Blogs – Where Are They?
2006-07-16: Spontaneous Emission and Amplifier Noise
2006-07-14: Lasers Like it Cool
2006-07-10: Strength of Thermal Lensing Effects
2006-07-05: Laser Design: Side Product or the Basis of Laser Development?
2006-07-01: Lifting the Confusion Concerning Doping Concentrations
2006-07-01: Characterizing a Cavity with a Frequency Comb
2006-07-01: With Wavelength Combs to Picometer Resolution
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