Color Corrected f-Theta Lenses

產品名稱 : Color Corrected f-Theta Lenses
產品說明 :
Applications of short pulse lasers are increasing rapidly because of high precision machining and reduced heat development in the material. But the use of femtosecond lasers offers some new challenges in the developing of focusing lenses.
While the dispersion in the material can neglected for fs-pulses, the color error caused by the spectral width of the pulse plays a decisive role. The spectral width of the pulse is increasing rapidly by shorter
pulse durations and for longer wavelengths. This results in a color error where the axial and lateral position of a focused beam varies for different colors. The amount of deviation of the resulting spot depends on the focal length and the wavelength.
The new color corrected f-Theta lenses for fs-pulse application are designed to correct a color error from 1.0 μm to 1.1 μm and to avoid internal ghosts, which are especially detrimental for the use of short pulses.