# Tagged Questions

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### Supercontinoum lasers

In my work I've encountered the phrase "supercontinuoum (CW) laser" quite a bit. After reading the wikipedia page, I'm interested in a more theoretical introductory. I'm mostly interested in ...
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### Dielectric permittivity tensor of rank 2

In special relativity, one knows the Euclidean and Minkowski metric to raise or lower the index of a covector or vector. The Euclidean metric is a (1,1) tensor and is represented by a 3x3 identity ...
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### Related to non-linear optics

It is said that the relation between Polarization and Electric field becomes non linear when applied electric field is comparable to interatomic field. What is its physical meaning?
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### Simple analog to second harmonic generation

I have been trying to explain second harmonic generation to my mum who is hopeless at physics. Does anyone know of a good simple analog for second harmonic generation? Preferably something that is ...
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### Why is second harmonic Intensity periodic in coherent length?

Solving for the intensity of second harmonic generation we get that intensity is $sinc^2(\pi/2*L/L_{coherent})$. How is calculated that the intensity is periodic in L_{coherent} (coherent length, L ...
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### Why does generating EUV frequency combs require femtosecond enhanced cavities?

When generating extreme UV (EUV) frequency combs using high-order harmonic generation, why does the harmonic generation step need to be inside a femtosecond enhanced cavity for the comb to work? More ...
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### Optical Frequency Divider?

Is there an optical frequency divider that works to make 1064nm light from 532nm light? The opposite of KDP crystals?
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### in fiber whats relation between nonlinear effects? [closed]

i only know when power light is more than threshold ,nonlinear is showed . why they called nonlinear?where characteristic is nonlinear,it is for me ambiguous. Self-Phase Modulation (SPM) Cross-...
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### Wave vector relation in nonlinear material

A light wave ($k_1,\omega_1$) travels in a medium of refractive index $n_1$ and then encounters a nonlinear medium ($n_2$) under the angle $\theta_1$. Snell's law tells us the wave's direction in the ...
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### Experimental evidence for nonlinear electrodynamics

Has any experiment been conducted which shows that, above a certain threshold of field strength, electromagnetic interactions become nonlinear? If not, which field strength threshold is the one under ...
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### Polarization in high energy vacuum non-linearity?

I heard that the vacuum becomes nonlinear at high energies. What is an intuitive explanation as to why this happens? For example, in classical optics non-linearitiy comes from material field ...
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### Third-order dispersion in glass, direction influence

I have learned that the third-order dispersion $\chi$ is a tensor with 81 elements. Nevertheless in glass one only has four elements, which either can be $x$ or $y$ (in this case). Now there exist ...
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### Is glass considered as a linear optical medium?

My research, which is mainly related to communication, involves the use of optical sources (mainly lasers). However, my background in photonics and optics is not yet solid, so my question might be a ...
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### Topological phase in Laguerre-Gaussian transverse mode

Why is the topological phase in a Laguerre-Gaussian transverse mode is the sum of orbital angular momenta per photon, and why is it quantized?