ECE_4300Homework_3 - ECE 4300 Homework 3 September 17, 2008...

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ECE 4300 H o m e w o r k 3 September 17, 2008 Due: Wednesday, September 24, in class I am really going to give you a workout with the ABCD law in this assignment. Once you finish this you will be ready to do a real cavity design. 1. This is an actual design problem from my lab. We built a ring laser that is totally symmetric, as shown below (not to scale). The only focusing optics are the two curved mirrors, each with radius of curvature R=15 cm. The gain medium is negligibly thick, placed exactly between the curved mirrors. Ignore it in this calculation. Assume λ = 1 μ m. RCC=15 cm RCC=15 cm a. How many beamwaists are there in this cavity? Where are they? (hint: if you feel an urge to do a calculation to answer this, stop and take a break). b. Find the range of distance over which the curved mirrors can be separated while maintaining a stable cavity. For the ease of calculation, assume the outer path distance remains a constant 370 cm as the curved mirrors are translated across the stability range. c.
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ECE_4300Homework_3 - ECE 4300 Homework 3 September 17, 2008...

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