iPhasematch vs APE Optics Calculator

iPhasematch allows you to calculate the phasematching condition of nonlinear wavelength conversion such as SHG or SFM based on published Sellmeier equiations. Downconversion (OPO) can be figured out by the reverse of SFM. It is a subset of the 'Qmix' function of a famous Windows software SNLO by Dr. Arlee Smith. This App does some of what SNLO does on your iOS device. It takes the crystal, two input wavelengths, and temperature and gives the phasematching orientations, effective nonlinear optical coefficients, walk-off angles, angular tolerance and temperature tolerance. In case of SHG, it also gives spectral tolerance. In biaxial crystals, it gives only the phasematching orientations in the principal planes, i.e., either theta=90 deg. or phi=0 or 90deg. Currently supported crystals: BBO, BiBO, CBO, CLBO, LB4, LBO, KBBF, KDP, KD*P, KN, KTP, Mg:LN, Mg:sLN, RBBF, RTP, YAB. NOTE: dn/dT data for LB4 was picked up from discrete data points in the reference and linearly extrapolated. Interface should be intuitive, giving phasematching with a tap of "PM" button,refractive index with "index" button and group index with "Gp.Idx" button, for the given condition (crystal, wavelengths, and temperature). DISCLAIMER: I cannot be held responsible for the result of the calculation it gives. I make every effort to make it accurate, and bug-free, but there could be errors in code. Please just use this on your own discretion.

The APE Calculator helps to easily evaluate often needed equations in ultrafast and nonlinear laser optics. This includes Sum Frequency Generation (SFM, SFG), Difference Frequency Generation (DFG), the wavelength relations in an optical parametric oscillator or amplifier (OPO, OPA) as well as in coherent anti-Stokes Raman scattering (CARS) or SRS spectroscopy. The conversion between wavelength, wavenumber, photon energy and frequency as well as different characterizations of pulses can be calculated, e.g. bandwidth, time bandwidth product, pulse duration or dispersion. Conversion of peak and average powers, pulse energy and pulse energy density, repetition rate and beam diameter as well as power densities is possible. Feedback as well as feature requests are appreciated.