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We report a passively mode-locked (ML) Tm:YAP laser pumped by an 790nm AlGaAs diode. With a semiconductor saturable absorber mirror (SESAM) as mode-locker, stable ML pulses is generated with pulse width of 1.89ps, repetition rate of 97MHz, and central wavelength of 1938nm. The highest ML output power of 710mW was obtained, to the best of our knowledge, this is the highest output power of SESAM based,...
The method of designing a freeform lens which can image on a formula describable non-planar surface with low distortion was proposed aimed on distortion correction. In this method, the Snell's law and the correspondence between the coordinates of object and the distortion free image are used to establish the partial differential equation which characterizes the freeform surface, and the partial differential...
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