Frequency doublers efficiency
Mar 1, 2017 12:13:45 GMT
apophys, concretedonkey, and 2 more like this
Post by shiolle on Mar 1, 2017 12:13:45 GMT
It's been a while since I designed lasers, and I never noticed before that frequency doublers can achieve 100.0% efficiency. I tried to experiment with their settings, and as you tweak their dimensions, it seems there is hard cap on efficiency and if not for it, certain materials could go higher. In particular, silver gallium selenide instead of having peak efficiency, has a significant range of physical dimensions where it stays at 100% efficiency, making it the best material for most laser designs.
I then tried to search for information on this material and frequency multiplication in general and it turned out CoaDE model barely scratches the surface of the topic. There is a wealth of information here. It turns out we don't know a lot about the lasers and frequency doublers in CoaDE, like what it the beam intensity profile and what kind of phase matching is used. I'm also not suer which inefficiencies are modeled and which are not.
Also, different crystals are transparent in different wavelength. To my understanding, CoaDE simulates transparency through complex refraction indices. If you open RefractionIndices.txt in Resources\Data folder inside of Children of a Dead Earth folder, you will find that some materials only have n indices while others also have k indices. If I am correct, then non-linear crystals don't have these k values for some reason. I have no idea what it means. Does the game treat all of them as completely transparent for all wavelengths? Without them, linear attenuation cannot be determined, as far as I understand. This appears to be the reason this page says different materials are better for different wavelengths. By the way, it says AgGaSe2 is suggested for infrared lasers.
I then tried to search for information on this material and frequency multiplication in general and it turned out CoaDE model barely scratches the surface of the topic. There is a wealth of information here. It turns out we don't know a lot about the lasers and frequency doublers in CoaDE, like what it the beam intensity profile and what kind of phase matching is used. I'm also not suer which inefficiencies are modeled and which are not.
Also, different crystals are transparent in different wavelength. To my understanding, CoaDE simulates transparency through complex refraction indices. If you open RefractionIndices.txt in Resources\Data folder inside of Children of a Dead Earth folder, you will find that some materials only have n indices while others also have k indices. If I am correct, then non-linear crystals don't have these k values for some reason. I have no idea what it means. Does the game treat all of them as completely transparent for all wavelengths? Without them, linear attenuation cannot be determined, as far as I understand. This appears to be the reason this page says different materials are better for different wavelengths. By the way, it says AgGaSe2 is suggested for infrared lasers.
