For prisms and substrates not listed below, please contact Tech Support. Thorlabs offers a wide variety of prisms, which can be used to reflect, invert, rotate, disperse, steer, and collimate light. This feature can be particularly useful when installing a dispersion compensator into an existing optical system. Furthermore, by including another pair of prisms (4 prisms total), the final rays can be made to propagate collinearly with each other as well as with the path of the incident rays. Then, a second prism is positioned such that the various wavelengths of refracted light rays will propagate parallel to each other upon exiting. As shown in the schematic above, the first prism is used to separate the various wavelength components. To achieve the specified GVD values while also maximizing transmission, light should be incident on the first prism at Brewster's Angle (Θ B). These effects can be reversed by using a prism pair such as those offered here to provide a negative dispersive system in order to shorten the duration of an ultrashort laser pulse. Consequently, femtosecond pulses are subject to pulse broadening as a result of group velocity dispersion (GVD). However, due to the wavelength-dependent nature of the index of refraction, longer wavelengths travel faster through an optical material than short wavelengths.
#Best webdesign comapny in arlington full
With a careful choice of prism pair geometry it is possible to create negative (commonly referred to as anomalous) dispersion that compensates for all other elements within the cavity.įor Thorlabs' full selection of optics for ultrafast applications, please see the Ultrafast Optics tab.Īs can be demonstrated through Fourier analysis, ultrashort pulses (small Δt) innately possess a broadband frequency spectrum (large Δf). However, this positive dispersion is somewhat offset by the extra distance that the longer wavelengths travel through the second prism (refer to the figure to the right). The prism pair also contributes positive dispersion. Each time light passes through the optical elements within a laser cavity, positive (commonly referred to as normal) dispersion occurs. Alternatively, prism pairs can be used for dispersion compensation. If the prism pair is placed inside a laser resonator, they can be used for wavelength tuning. They can be used to create an optical filter simply insert a knife edge to attenuate the short- or long-wavelength components. Prism pairs such as these have multiple applications.
Four large-index-of-refraction prism materials are offered to provide various group velocity dispersion (GVD) values, thereby compensating for different pulse dispersion conditions. These Dispersion-Compensating Prism Pairs are designed to compensate for the pulse broadening effects that occur in ultrafast laser systems without introducing significant power losses. Fabricated from CaF 2, Fused Silica, SF10, or N-SF14.
0 kommentar(er)
