Ahe-ne laser, with the resonator length of 100 cm, has a doppler linewidth ∆νd = 1.5 ghz and midband gain coefficient γ(νo) = 2 x 10-3 cm-1. the length of the resonator d = 100 cm, and the reflectance of the mirrors are 98 % and 97% (all other resonator losses are negligible). assuming that the refractive index n = 1, determine the frequency spacing νf between the resonator modes and the number of laser modes

Industrial processes often require the damping of vibrations. consider a workbench that uses four large ideal springs in place of traditional legs, with each spring supporting one corner of the workbench and exhibiting a force constant of 47500 n/m. this workbench is used when creating products that involve highly unstable chemicals. according to specifications, the acceleration of the manufacturing equipment must be held to less than 22.3 m/s2 for the manufacturing process to proceed safely. the amplitude of vibrations are expected to remain under 0.622 mm throughout. given that the workbench and maufacturing equipment combine to 6.05 kg, find the maximum acceleration expected of the equipment and workbench. (ignore the mass of the springs.)