Mediaspace scheduled maintenance: Aug 25, 2026 07:00 - 12:00 AM. During this time, videos will be temporarily unavailable. Check status updates.

Lecture

Heat Flow: Light-Materials Interaction

In course

MICRO-520: Laser microprocessing

The physical principles of laser light materials interactions are introduced with a large number of industrial application examples. Materials processing lasers are developing further and further, the lecture presents the physical limitations of the proces ...

Description

This lecture covers the interaction between light and materials, focusing on topics such as reflection, refraction, polarization, absorption, and scattering. It also delves into the effective medium approximation, two-photon absorption, and the localization of multiphoton absorption. The discussion extends to heat flow, including the transport mechanisms of convection, conduction, and radiation, as well as the parameters influencing heat transport dynamics. The lecture explores phase transitions, material properties affecting heat flow, and the Stefan-Boltzmann law for radiation cooling.

This video is available exclusively on Mediaspace for a restricted audience. Please log in to MediaSpace to access it if you have the necessary permissions.

Watch on Mediaspace

Instructor

Patrik Willi Hoffmann

Official source

Related concepts (32)

Heat transfer

Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy (heat) between physical systems. Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes. Engineers also consider the transfer of mass of differing chemical species (mass transfer in the form of advection), either cold or hot, to achieve heat transfer.

Polarization (physics)

Polarization (also polarisation) is a property of transverse waves which specifies the geometrical orientation of the oscillations. In a transverse wave, the direction of the oscillation is perpendicular to the direction of motion of the wave. A simple example of a polarized transverse wave is vibrations traveling along a taut string (see image); for example, in a musical instrument like a guitar string. Depending on how the string is plucked, the vibrations can be in a vertical direction, horizontal direction, or at any angle perpendicular to the string.

Reflection (physics)

Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves. The law of reflection says that for specular reflection (for example at a mirror) the angle at which the wave is incident on the surface equals the angle at which it is reflected. In acoustics, reflection causes echoes and is used in sonar. In geology, it is important in the study of seismic waves.

Thermal conduction

Conduction is the process by which heat is transferred from the hotter end to the colder end of an object. The ability of the object to conduct heat is known as its thermal conductivity, and is denoted k. Heat spontaneously flows along a temperature gradient (i.e. from a hotter body to a colder body). For example, heat is conducted from the hotplate of an electric stove to the bottom of a saucepan in contact with it.

Elliptical polarization

In electrodynamics, elliptical polarization is the polarization of electromagnetic radiation such that the tip of the electric field vector describes an ellipse in any fixed plane intersecting, and normal to, the direction of propagation. An elliptically polarized wave may be resolved into two linearly polarized waves in phase quadrature, with their polarization planes at right angles to each other. Since the electric field can rotate clockwise or counterclockwise as it propagates, elliptically polarized waves exhibit chirality.

Related lectures (47)

Heat transport: Conduction, Convection, Radiation

Explores heat transport through conduction, convection, and radiation in micro and nanosystems.

Heat: Transport and Boundary Conditions

Explores heat transport mechanisms like conduction, convection, and radiation, along with boundary conditions for heat exchange.

Heat Transfer Fundamentals

Explores heat transfer mechanisms, including conduction, convection, and radiation, and the principles of energy conservation and entropy increase.

Radiative Exchange in Heat Transfer: View Factors and Properties

Discusses radiative exchange principles, focusing on view factors and their applications in heat transfer calculations.