This applet simulates the operation of a Fabry-Perot interferometer under diffuse illumination by two closely separated wavelengths.
On starting the applet, the user has access to four panels:
- The top left panel controls parameters relevant to the interferometer such as the separation in distance between the mirrors, the reflectivity, the first wavelength and the difference between the two wavelengths. Under the -User Defined- mode the interferometer is air-spaced (n=1). The -Code- input allows the user to input a number (such as their student number) to generate a random wavelength separation (between 0.005 nm and 0.1 nm) when using the -Unknown- option. Here the interferometer is set to be made of fused silica (n=1.46071) and the wavelength is restricted to 532 nm.
- The top right panel shows the image as seen on a camera placed 1 m from the interferometer.
- The bottom left panel provides a set of controls for how the image is viewed. Position and intensities are shown according to the position clicked in the camera display. Position units are in mm.
- The bottom right panel can be set to show the layout of the interferometer, the intensity across a horizontal linear array, or the time history of the intensity at the selected position.