ISO 14880-1:2001 pdf download

ISO 14880-1:2001 pdf download.Optics and photonics – Microlens arrays —Part 1: vocabulary.
6.1.7 Aperture
6.1.7.1
aperture shape
shape which is specified as square, circular, hexagonal, circular sector or other geometric shape
NOTE For non-regular shapes, the vertices of the lenslet aperture are to be defined by coordinates, Xa,k, Yalk, where I is the lenslet number index and k is the vertex number index.
6.1.7.2
geometric aperture
Ag
area in which the optical radiation passing through it is deviated towards the focused image and contributes toit
NOTE 1 For graded index microlenses where no obvious boundary exists, the edge is the focus of points at which the change of index is 10 % of the maximum value.
NOTE 2 The geometric aperture is expressed in square miIlmetres.
6.1.7.3
lens width
2ti, 2a2
widths of the microlens on the substrate consisting of the geometric aperture of the microlens given by a variety of shapes such as circular, semi-rectangular, elliptical and so on
NOTE 1 The widths are determined by measuring the longest distance (2a1) and the shortest distance (2a2) between the lens edges as shown in Figure 4. If the lens is circular symmetric, then the term diameter can be used.
NOTE 2 Lens widths are expressed in millimetres.
6.1.7.4
diffraction-limited optical aperture
Ad
area within which the peak-to-valley wavefront aberrations are less than one quarter of the wavelength of the radiation with which it is tested
NOTE The diffraction-limited optical aperture is expressed in square millimetres.
6.1.7.5
geometrical numerical aperture
NA9
sine of half the angle subtended by the aperture of the lens at the focal point
6.1.7.6
diffraction-limited numerical aperture
NAd
sine of half the angle subtended by the diffraction limited optical aperture of the lens at the focal point
6.1.8
focal ratio
ratio of the focal length to the lens width of the geometrical aperture
NOTE The focal ratio is equivalent to the practical f-number.
6.1.9
imaging quality
quality of the microlens which is determined by Modulation Transfer Function (MTF) according to Iso 15529 or the Strehl ratio
NOTE The imaging quality should be measured in the conjugates in which the microlenses are to be used and preferably for a range of angles of incidence.
6.1.10
focal spot size
Wx, WY
half width in the x direction and y direction, respectively, at which power density is decreased to the l/e2 irradiarice levels at the practical focus point when the microlens is irradiated with a uniform plane wavefront
NOTE Focal spot sizes are expressed in micrometres.
6.2 Properties of the microlens array
6.2.1 Geometrical properties
6.2.1.1
structure of the microlens array
geometrical arrangement of the individual microlenses and feature of the substrate
NOTE There are generally two types of arrangements:
regular and irregular. Regular can be rectangular, hexagonal or polar regardless of the overlapping of microlens on the substrate. The specification has to completely describe the arrangement for the microlens array. The lens array positions X,, Y and aperture vertex coordinates are used to define this structure. For regular structures, only the spacing and geometry are to be defined.
6.2.1.2
lens aperture centre position
x, y,z
coordinates of the location of the centre of a given lens in the array
NOTE 1 The indexj may be added as needed to identify a particular lens number.
NOTE 2 The coordinates of the lens aperture centre position are expressed in millimetres.
6.2.1.3
focal spot position
sx, sy, s
coordinates of the focal spot geometrical positions
NOTE 1 The indexj may be added to specify a particular lenslet.
NOTE 2 The focal spot position need not be specified if the array is telecentric and regular.
NOTE 3 The coordinates of the focal spot position are expressed in millimetres.
6.2.1.4
focal spot position shift
1:S, iS, iS
offset distance from the X, Y, 7 coordinates of the lens position to the focal spot position
NOTE 1 tS = X-S, S, = Y-S iS = Z-S.
NOTE 2 The focal spot position shift is expressed in millimetres.
6.2.1.5
pitch
PxI Py
distance between the centres of adjacent lenses which may vary across and will vary with direction
NOTE 1 P, P, are defined as pitch of x, y direction as shown in Figure 4.
NOTE 2 The pitch is expressed in millimetres.
6.2.1.6
lens density
number of enses per unit area of the array
NOTE The lens density is expressed in millimetres to the power minus two.