**When graphene serves as a saturable absorber, it can generate two types of mode-locking states**
Passive mode-locked technology utilizes saturable absorbers' nonlinear absorption effect to regulate the cavity's loss and phase to generate mode-locked pulses. Graphene has a unique energy bandgap structure, a low absorption coefficient, a considerable modulation depth, and an ultrawide operating spectral range (300โ2,500 nm). โ Read more
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