A method for computing the polychromatic MTF of hybrid refractive - diffractive elements is described taking into consideration the effects of not only the primary diffraction order but also the effects of additional parasitic diffraction orders. The results of this approach are compared with the more conventional single order calculation and with actual measured performance. For certain markets and applications the cost of infrared lenses are critical in order to achieve customer expectations. Two possible methods of realising this requirement are the use of moulded optics or the use of multiple kinoform optics with no refractive power. Examples of such lenses are given along with discussion of the merits and limitations that each approach entails.
[1]
P. Clark,et al.
Modeling diffraction efficiency effects when designing hybrid diffractive lens systems.
,
1992,
Applied optics.
[2]
D. A. Buralli,et al.
Effects of diffraction efficiency on the modulation transfer function of diffractive lenses.
,
1992,
Applied optics.
[3]
Andrew P. Wood.
Infrared hybrid optics: analysis and implementation
,
2001,
Optics + Photonics.
[4]
John R. Rogers,et al.
Some fundamental limitations of achromatic holographic systems
,
1989
.
[5]
W C Sweatt.
Achromatic triplet using holographic optical elements.
,
1977,
Applied optics.