This program is used to calculate the wavelength relationship between the pump, signal, and idler in an optical parametric amplifier. The formula is:
$$\frac{1}{\lambda_{pump}} = \frac{1}{\lambda_{signal}} + \frac{1}{\lambda_{idler}}$$
Here, λpump, λsignal, and λidler represent the wavelengths of the pump, signal, and idler, respectively. Unit: nanometers (nm).