Non-linear Frequency Conversion: OPO

This lecture covers the principles of optical parametric oscillators (OPO) for non-linear frequency conversion, including sum-frequency and difference-frequency generation, slowly varying envelope approximation, wave-vector mismatch, and parametric amplification. The instructor explains the oscillatory behavior in the generated fields, perfect phase matching conditions, and the application of OPO in engineering. The lecture also delves into the fundamentals of OPO bandwidth, tuning curves, and commercial OPO systems, providing insights into their typical tuning ranges and average power outputs.