Nonlinear Optics Puns

I'm having trouble finding a good explanation of what is going on that is understandable for someone without background in optics.

so i understand DFG is the process where w1,w2 are input, and w3 is the output, where w3=w1-w2.

now, the energy diagram shows w1 getting absorbed and w2 and w3 being emitted.

wouldn't that mean that the output should be both w3 AND w2? and why is w2 a required input here?

is the w2 input supposed to cancel out the emission of w2 via destructive interference?

that'd be my reflexive guess but i'm not seeing any mention of such interference and in this lecture the w2 emission in the energy diagram has (amplified) next to it which would be the opposite of destructive interference, if anything. so i'm missing something important here.

...halp?

Hi reddit

I'm preparing a shopping list of instrumentation which will be used to fund my startup. That means, which equipment is needed for a specific type of measurement. Any idea of what it might cost?

• Birefringence on crystals, probably using a Prism Coupler operating at around 1310 & 1550 nm
• Setup for SHG measurements from powders, i.e. using the Kurtz-Perry method, same wavelength region.
• Alternatively, are there any specific organizations which can do this as a service

I assume that you know what SHG means, but please assume nothing about me, I'm just an organic chemist.

Thanks and have a happy Jan. 3!

I am very excited to share our recently published work towards developing nonlinear activation functions for optical neural networks (ONNs).

There has been a lot of interest in specialized hardware for achieving high efficiency and performance on machine learning tasks. Matrix-vector multiplications are one of the most important (and computationally expensive) operations in neural networks. It turns out that analog optical processors can perform these operations in O(1) time (rather than the O(n^2) time on GPUs and CPUs). These specialized ONN processors, which are driven by modulated lasers, could potentially be scaled to use far less energy per operation than conventional digital processors.

Of course, the other piece of the puzzle for neural networks is the nonlinear activation function. Optics is excellent for performing linear operations, but nonlinearities are far more difficult, especially in on-chip circuits. Basically, in nature, if you want to see something or to send information, you use light. But, if you want to make a decision on that information you use electrical charge.

Our paper (linked below) proposes a scheme for building a full ONN with an activation function by coupling a small electrical circuit to the output of each ONN layer. This electrical circuit converts a small amount of the optical signal into and electrical voltage, which then nonlinearly modulates the optical signal. We performed a benchmark of this ONN on the MNIST image recognition task and found that our activation function significantly boosted the classification accuracy of the ONN, from ~85% without the activation to ~94% with the activation. This is still a bit below the performance achieved in state-of-the-art models, but our setup used only 16 complex Fourier coefficients of the images as inputs (rather than all 784 pixels).

Checkout the paper below and feel free to ask questions. Our two Python ONN simulator packages (developed by two of my co-authors) are available on GitHub: https://github.com/fancompute/neuroptica and https://github.com/solgaardlab/neurophox. These repos include several examples if you're interested in playing around with training ONNs on a computer.

Journal Paper: https://doi.org/10.1109/JSTQE.2019.2930455

arXiv preprint: [https://arxiv.org/abs/1903.04579](https://arxiv.org

Although many metal–organic cages (MOCs) and a few hydrogen‐bonded organic cages (HOCs) have been individually investigated, little is reported about the cooperative self‐assembly of MOCs and HOCs. Herein, we first describe an unprecedented MOC&HOC co‐crystal, which is composed of tetrahedral Ti4L6 (L = embonate) cages and in‐situ generated [(NH3)4(TIPA)4] (TIPA = tris(4‐(1H‐1,2,4‐triazol‐1‐yl)phenyl)amine) cages. Chiral transfer phenomenon is observed from enantiopure Ti4L6 cage to enantiopure [(NH3)4(TIPA)4] cage. Accordingly, two homochiral supramolecular frameworks with opposite handedness (PTC‐235(Δ) and PTC‐235(Λ)) are formed. Such MOC&HOC co‐crystal features high stability in water and other solvents, affording single‐crystal‐to‐single‐crystal transformation to trap CH3CN molecules and identify disordered NH4+ cations. Moreover, a tablet pressing method is firstly developed to test the third‐order nonlinear optical property of KBr‐based PTC‐235 thin film. Attributing to the abundant π‐π accumulation between two different tetrahedral cages, such thin film exhibits excellent optical limiting effect. This work not only presents an extraordinary MOC&HOC co‐crystal assembly, but also provides a new insight on the function of cage materials.

https://ift.tt/2JfZrm3

In my daily position, I am a Professor of Electrical Engineering and by courtesy of Applied Physics at Stanford University, where I lead the Nanoscale and Quantum Photonics Lab in the Ginzton Laboratory. After completing my PhD in Electrical Engineering from the California Institute of Technology (Caltech) in 2002, I worked as a postdoctoral scholar at Stanford. In 2003, I joined the Stanford Electrical Engineering Faculty, first as an assistant professor (until 2008), then an associate professor with tenure (2008-2013), and finally as a professor of electrical engineering (since 2013). As a Humboldt Prize recipient, I also have a visiting position at the Institute for Physics of the Humboldt University in Berlin, Germany (since 2011). In 2013, I was appointed as a Hans Fischer Senior Fellow at the Institute for Advanced Studies of the Technical University in Munich, Germany. I am honored to be a Fellow of The Optical Society (OSA) and the American Physical Society (APS).

I'll be back at at 3 pm ET to answer your questions, ask me anything!

Hey all -- I can't find anything about this on the web, and I figured if anyone would know the answer to this question, it'd be the brilliant folks who frequent /r/NoMansSkyTheGame!

So I've finally gotten the 3 destabilised sodium I need to install the Nonlinear Optics upgrade for my Photon Cannons on my ship, but after installing the upgrade, I'm confused. The description of the upgrade reads as follows:

>Replaces the conventional Photon Cannon optics with an experimental glass array, boosting combat performance.
>
>Significantly improves heat sink capacity.
>
>Stats
>
>Total Cannon Count: 3

This description is confusing for several reasons:

• First, the logo for the upgrade displays the same weapon face that the infra-knife upgrade (the main one, that adds the infra-knife to the ship for use) uses, which at first had me thinking this was an infra-knife upgrade.
• Second, the description says it's replacing the Photon Cannon optics, but then says this "significantly improves heat sink capacity," which is strange in itself. Replacing the optics of a device doesn't imply the heat sink is changed at all, and swapping out the optics alone wouldn't improve heat sink capacity in any way.
• Finally, third, the "stats" section of the description says implies that the upgrade will increase the total number of physical Photon Cannon modules from 2 to 3.

For the most part, I've been able to ascertain exactly what any upgrade (for any piece of gear, suit, ship, or multi-tool) is actually going to do when installed by, before installing it, reading the bottom-most section of that upgrade's description. More often than not, that section of the upgrade's description block ends up showing the actual functionality of an upgrade once it's installed. In this case, that was the "stats" section. However, after installing this upgrade, I've still only got two physical photon cannon modules on my ship.

I'm hoping that in the future Hello Games will do a pass of all upgrades (whether they're offered at a vendor or procured in the wild from other denizens of the universe) to ensure that their verbiage is not only not confusing/contradictory, but that it accurately describes exactly what that upgrade does. It's frustrating to spend a non-trivial amount of time farming for materials/nanites/credits for a specific upgrade, only to get the upgrade and be disappointed because the upgra

Hello,

I was wondering if anyone has experience in optics research, particularly nonlinear. What mathematics do you tend to use in your research? Is it similar to the common math taught to us in undergrad like real analysis / diff eqs? Is your study built mostly on visual and system models rather than on pure functional math? I am looking to get into the field of optical processing as a graduate student, and I need to update my math knowledge.

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I am doing an Introduction to Nonlinear Optics Concepts presentation in my upper level Optics course. So far I took apart a green laser pointer to get the two crystals to do the Second Harmonic Generation demonstration, but I was wondering if anyone knew of any other simple demonstrations I could do?

I am also looking for any applets or programs that could show some nonlinear optics concepts. I tried Colorado's PheT collection and a brief look online but couldn't really find much, perhaps you know somewhere else to look. I'd like to demonstrate self-focussing and perhaps optical rectification if possible.

Thanks!

Hi guys, mathematically I understand the second order polarization response of a material to light. But I am confused about the physical reasoning of how the second order response generates light of new frequencies.

I know you can approach it from a virtual state point of view, with photons being absorbed and emitted, but that doesn't help me understand the electromagnetic wave explanation. What determines the polarization and propogation direction of the second harmonic, for example?

Thanks. :-)

I am a freshman engineering student, and I was lucky enough to get picked by my physics professor to help him with his research in nonlinear optics, but I know pretty much nothing about the topic. I am a freshman and my knowledge is quite limited and he is well aware of that fact and doesn't really expect anything from me at the moment, but I want to start researching into the topic on my own until I actually start working with him. Any suggestions?

I tried researching into this optical behavior, but I can't seem to get a good grasp on what it is. I obviously need a ELI5 - this branch of physics is no where close to my current work.

Can someone tell me what the nonlinear optics upgrade that give you 3 for a total cannon count does? Does it actually increase how many shots you fire or is it even for the photon cannon because its picture shows the infra-knife weapon on it.

Edit: I tested it out and it does not give you an extra shot or is part of the photon cannon upgrade

I am doing an Introduction to Nonlinear Optics Concepts presentation in my upper level Optics course. So far I took apart a green laser pointer to get the two crystals to do the Second Harmonic Generation demonstration, but I was wondering if anyone knew of any other simple demonstrations I could do?

I am also looking for any applets or programs that could show some nonlinear optics concepts. I tried Colorado's PheT collection and a brief look online but couldn't really find much, perhaps you know somewhere else to look. I'd like to demonstrate self-focussing and perhaps optical rectification if possible.

Thanks!