Dear ResearchGate community,
I created the following ultrafast laser oscillator design. Designing such lasers is rather difficult task so I need you to challenge my idea, why this would not work. I hope you can help. See attached the optical schematics (optical simulation model).
The dark red beam is the pump which creates a ring formed (telecentric) pumped area on the Yb:CaF2 crystal with 10mm outer diameter and 9.4mm inner diameter. There is one nonlinear Michelson interferometer on each side of the crystal. The one on the left side is for passive mode locking and the one on the right is for coupling out pulses. Basically the left side works as a output coupler for low intensity light and the right side works as a mirror for low intensity light. As the pulse energy of the circulating pulse increases, eventually the right side couples out most of the pulse and the left side reflectance increases. Note, that the pulse will have to circulate many times before it reaches the energy that it can couple out.
This passive mode locking technique was used earlier in this (Article Passive mode locking with a nonlinear Michelson interferomet...
) paper and later on it was called Additive-pulse Mode Locking (https://www.rp-photonics.com/additive_pulse_mode_locking.html) with minor changes in the concept.The current layout is designed for 100fs considering 100uJ pulse energy and 50W average power pumping at 976nm.
Let me know what you think!
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