About this app
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.
Latest release
What’s New
- complete redesign with side menu - light and dark themes (follows system theme) - pin your favorite calculations to the home page - view news on the home page - share calculation results - all calculations now have an explanatory text - save your preferred units and outputs per calculation - wavelength conversion now shows color for visible light - photon energy (eV) has been added to most calculations - propagation of light now includes refractive index and resonator repetition rate
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 23, 2026 · 3:48 PM Free
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