Reducing effects caused by formation of multiple foci in a deformable lens during changes of applanation of surfaces thereof

An optical system having an optical axis and comprising:

• a first lenslet coaxial with the optical axis and having a first front surface and a first back surface,
• a second lenslet disposed coaxially with the first lenslet and having a second front surface and a second back surface,
• wherein the first back surface and second front surface contact each other at an axial point on said optical axis when the first and second lenslets are not under stress;
• a support structure comprising a first lenslet support element supporting the first lenslet and a second lenslet support element supporting the second lenslet,
• a first bearing and/or a second bearing movably connecting the first lenslet support element and/or the second lenslet support element relative to each other and/or the support structure and configured to translate the first lenslet support element and/or second lenslet support element substantially parallel to the optical axis and/or to alternate stress applied to at least one of the respectively supported first and second lenslets such as to applanate at least one of the first back surface and the second front surface and to enable alteration of an applanated area of contact between the first back surface and the second front surface that is centered on the optical axis by applying a first external force that advances or retracts at least one of the first lenslet support element and the second lenslet support element with respect to the other and/or by applying a second external force vectored substantially transversely to the optical axis to the first lenslet and/or the second lenslet,
• wherein the optical system satisfies one or more of the following conditions (9a), (9b), (9c), (9d), and (9e):
• condition (9a);
• the support structure further comprises an auxiliary lenslet support element supporting at least one auxiliary lenslet that is co-axial with the optical axis and in contact with a surface of a chosen lenslet of the first and second lenslets of the optical system only at an axial point thereof when the auxiliary lenslet and the chosen lenslet are not under stress,
• wherein the support structure further comprises an auxiliary bearing movably connecting the auxiliary lenslet support element to the support structure and/or the first lenslet support element and/or the second lenslet support element, thereby enabling a translation of the auxiliary lenslet support element relative to the first lenslet support element and/or relative to the second lenslet support element in response to an auxiliary external force, and thereby enabling a change in an applanated contact area between a surface of the at least one auxiliary lenslet and a surface of the chosen lenslet by altering an auxiliary external force to either compress the at least one auxiliary lenslet and the chosen lenslet against one another along the optical axis or to relax axial pressure exerted by one of the at least one auxiliary lenslet and the chosen lenslet on the other of the at least one auxiliary lenslet and the chosen lenslet;
• wherein an alternation of the auxiliary external force applanates a surface of the at least one auxiliary lenslet and/or a surface of the chosen lenslet and enables a change in an auxiliary surface area of contact between a surface of the at least one auxiliary lenslet and the surface of the chosen lenslet;
• condition (9b);
• at least one of lenslet support elements present in the optical system has corresponding first contacting area and second contacting area cooperated with a corresponding lenslet of the optical system at two respective different radial positions, and wherein the first contacting area and the second contacting area are coupled mechanically with one another to transfer force applied to at least one of the first and second contacting areas onto of the corresponding lenslet to thereby reversibly shift at least a portion of a circumferential edge of the corresponding lenslet along the optical axis while substantially not affecting an axial position of a center of the corresponding lenslet;
• condition (9c);
• two immediately neighboring lenslets of constituent lenslets of the optical system comprise respective haptics extending radially from circumferential regions of said two immediately neighboring lenslets, the respective haptics dimensioned to be in contact with one another at respective ends thereof to transfer an axial force applied to at least one of the two immediately neighboring lenslets to at least a part of the circumferential edge of the at least one of the two immediately neighboring lenslets to thereby reversibly shift the at least said part along the optical axis while substantially not affecting an axial position of a center of the at least one of the two immediately neighboring lenslets;
• condition (9d);
• wherein at least one of facing and contacting each other surfaces of the two immediately neighboring lenslets includes, in an unstressed state, an aspheric surface centered on the optical axis;
• condition (9e);
• wherein the support structure further comprises a radial loader device movably supported between an inner loader position and an outer loader position, wherein the inner loader position is defined at a first radial distance from the optical axis and the outer loader position is defined at a second radial distance from the optical axis, wherein the second radial distance is larger than the first radial distance,
• wherein the radial loader device is attached to a respective circumferential edge of at least one of the first, second, and the at least one auxiliary lenslets to apply radially-directed force to said circumferential edge;
• and
• wherein the support structure includes a housing unit defining a hollow therein, a respective portion of said first lenslet, said second lenslet, and that at least one auxiliary lenslet being disposed in the hollow, and wherein the respective portion of at least one of the first, second, and auxiliary support elements is dimensioned to reversibly move inside the hollow along the optical axis.