please help me with correct answer and explain variables also

3. Consider the diagram of a laser diode below, which emits A = 808 nm light. Take d = 2 um, dy = 10 um, ex = 25, and dy = 59. Assume that we can treat the beam as though it has different Gaussian optical properties in the two transverse directions, x and y. Therefore, we can think of ex and dy as rep- resenting the far-field divergence angle in each transverse plane. Moreover, we can assume that the beam waist is located directly at the output facet of the diode gain medium. dx Figure 1: Schematic for Question 3. A cylindrical lens is a type of lens that has cylindrical curvature instead of spherical curvature. Therefore, it only influences the complex beam parameter along one transverse plane of the beam. Suppose that you would like to perfectly collimate the laser diode into a round Gaussian mode with a beam radius of w = 4 mm using two cylindrical lenses. What would be the focal length of each cylindrical lens and where should they be placed