226 reputation
16
bio website None
location Berlin, Germany
age 34
visits member for 3 years, 9 months
seen Oct 9 '13 at 12:14

Apr
26
comment Cooling a cup of coffee with help of a spoon
Argh. No SI units :P
Apr
26
comment What software programs are used to draw physics diagrams, and what are their relative merits?
I used matplotlib for many graphics in my thesis. The only downside is the lack of tex output. This meant I had to import my .svg files in Inkscape to add text an then export is as tex.
Apr
26
comment Software for geometrical optics
I thought of raytracers when I wrote my comment since they can calculate (some) aspects of wave optics but clearly you are right.
Jan
21
awarded  Scholar
Jan
21
accepted How can the 5-photon absorption coefficient be estimated?
Jan
21
answered How can the 5-photon absorption coefficient be estimated?
Jan
18
awarded  Yearling
Jan
18
comment How can the 5-photon absorption coefficient be estimated?
I think you are mixing two things here: The non-linear coefficients rise as powers of two, where the intensity rises by one. Simply stated this stems from the fact that polarisation depends on electric field like $P(E)=\chi^1 |E| + \chi^3 |E|^3 + ...$ and since the absorption loss $W$ depends on $W=P * E$ you get $W_5=\chi^9 |E^9|*E = \chi^9 * I^5$. Thus in essence I am interested in the $\chi^9$ coefficient for 5-photon absorption.
Jan
18
revised Looking for a reference book, or book chapter to learn about piezoelectricity
corrected grammar
Jan
17
comment How can the 5-photon absorption coefficient be estimated?
Hmm, could you elaborate on what you mean by "leading order difference"?
Jan
17
answered Looking for a reference book, or book chapter to learn about piezoelectricity
Jan
17
comment Withstanding charlatans: How to protect friends from buying “water structuring facilities”?
This question should be expanded to "How to protect from homeopathy". The same arguments against it holds for the water people just as well.
Jan
17
comment How can the 5-photon absorption coefficient be estimated?
Indeed, those effects are extremely small. I want to show that this process is irrelevant in comparison to any intensities that might be produced in a lab. I could go for a rough estimate and just say that if 2 or 3-photon absorption has very small values, then 5 will certainly be neglegible.
Jan
16
asked How can the 5-photon absorption coefficient be estimated?
Nov
13
comment Bandgap Spacing in Photonic Crystals
Also, isn't the Bragg formula used for constructive interference? If so you'd have to take d*0.5
Nov
13
comment Bandgap Spacing in Photonic Crystals
What exactly is an amorphous photonic crystal? One which has no long-range order?
Nov
13
comment Are a quantum mechanical system a chaotic (yet deterministic) system?
Your point 1 is wrong. QM systems are deterministic. It is a statistical theory, yes, and single outcomes of an experiment might look random but an ensemble of experimental outcomes is definitely deterministic.
Jun
25
awarded  Commentator
Jun
25
comment What is your prefered toolkit / program for 3D visualisations of data?
Btw: How is this not off-topic: physics.stackexchange.com/questions/11451/… ?? Oh wait, it relates to HEP. Must be valid I guess.
Jun
25
comment What is your prefered toolkit / program for 3D visualisations of data?
Not constructive/off topic? How can analysing ones data efficiently not be constructive? I guess I'm not thinking like a theorist here, lacking imagination. Oddly enought all the journals I read seem to show what I'm talking about. Guess people don't read Science, Nature, PRL, etc. any more.