An observation device capable of observing a subject plane. The observation device includes a light receiving surface and an imaging optical system for forming an image of light from the subject plane onto the light receiving surface. The imaging optical system includes a concave primary mirror, a secondary mirror, and a flat extraction mirror. The beam of the light from the subject plane is reflected at the concave primary mirror, the convex secondary mirror, and the concave primary mirror in the named order, after which an image of the beam is formed on the light receiving surface via the flat extraction mirror. The observation device changes an angle and an angle .

An electronic intraocular device is implantable into the capsular bag of a wearer's eye. In some cases, the intraocular device may include a femtoprojector. The femtoprojector projects images onto the wearer's retina when the electronic intraocular device is implanted in the wearer's eye. Different haptic designs may be used to keep the femtoprojector in position. In some embodiments, an imager is contained in a contact lens worn by the wearer. Images captured by the contact lens imager may be relayed to the intraocular femtoprojector. In some cases, the intraocular device may include an electronic capsular tension ring with a femtoimager. The femtoimager may capture images of the wearer's retina, for example for purposes of monitoring eye health.

An electronic intraocular device is implantable into the capsular bag of a wearer's eye. In some cases, the intraocular device may include a femtoprojector. The femtoprojector projects images onto the wearer's retina when the electronic intraocular device is implanted in the wearer's eye. Different haptic designs may be used to keep the femtoprojector in position. In some embodiments, an imager is contained in a contact lens worn by the wearer. Images captured by the contact lens imager may be relayed to the intraocular femtoprojector. In some cases, the intraocular device may include an electronic capsular tension ring with a femtoimager. The femtoimager may capture images of the wearer's retina, for example for purposes of monitoring eye health.

A measuring arrangement for measuring optical properties of a reflective optical element, in particular for microlithography, with an EUV light source (5), a detector (20) configured to detect EUV radiation reflected at the reflective optical element (10), and an imaging system (30, 40, 50, 60, 70, 80, 90), which images object points on the reflective optical element onto respective image points on the detector, wherein the imaging system is configured to reflect the EUV radiation, a first optical component (31, 41, 51, 61, 71, 81, 91), and at least one second optical component (32, 42, 52, 62, 72, 82, 92). Both at the first optical component and at the second optical component, reflection angles with respect to respective surface normals that respectively occur during reflection of the EUV radiation are at least 70.

A projection apparatus includes an image-producing element and projection optics. The image-producing element produces at least one image, and the projection optics has free-form areas for magnifying and reflecting the image toward an viewer for observation. The projection optics includes at least a first mirror and a second mirror, the image is reflected by the first mirror and the second mirror in succession, no deflection mirror is disposed between the viewer and the second mirror, and the first mirror and the second mirror are in the form of a non-rotationally symmetrical system.

Wide-field fluorescence imaging systems and methods. A bi-telecentric optical imaging system comprising imaging optics arranged and positioned such that a first telecentric space is created or exists between a sample platform and an entry aperture stop wherein Principal or chief rays from a plurality of field points on the sample platform are parallel to each other when passing through a first filter; and such that a second telecentric space is created or exists between a light detector and an exit aperture stop wherein the Principal or chief rays from the plurality of field points are parallel to each other when passing through a second filter. In this manner, light collected from different points in the field of view pass through the first filter at the same angles and also through the second filter at the same angles to thereby reduce or eliminate angular spectral shifting effects.

A long-path gas absorption cell reflective optical system, which includes a first reflector (1) and a second reflector (2), the first reflector (1) and the second reflector (2) are set opposite and spaced apart, with the second reflector (2) having an optical input port (3) and an optical output port (4). The first reflector (1), the second reflector (2), the optical input port (3), and the optical output port (4) together constitute a multiple reflection optical system; a collimated light beam enters through the optical input port (3) and reflects between the first reflector (1) and the second reflector (2), finally exiting through the optical output port (4). This achieves a longer light path for the collimated light beam within a limited space, allowing for more reflections; the system has a simple structure, relatively simple optical adjustment, is easy to operate, and has stable performance, making it widely applicable in various detection environments.

An electronic intraocular device is implantable into the capsular bag of a wearer's eye. In some cases, the intraocular device may include a femtoprojector. The femtoprojector projects images onto the wearer's retina when the electronic intraocular device is implanted in the wearer's eye. Different haptic designs may be used to keep the femtoprojector in position. In some embodiments, an imager is contained in a contact lens worn by the wearer. Images captured by the contact lens imager may be relayed to the intraocular femtoprojector. In some cases, the intraocular device may include an electronic capsular tension ring with a femtoimager. The femtoimager may capture images of the wearer's retina, for example for purposes of monitoring eye health.

A long-path gas absorption cell reflective optical system, which includes a first reflector (1) and a second reflector (2), the first reflector (1) and the second reflector (2) are set opposite and spaced apart, with the second reflector (2) having an optical input port (3) and an optical output port (4). The first reflector (1), the second reflector (2), the optical input port (3), and the optical output port (4) together constitute a multiple reflection optical system; a collimated light beam enters through the optical input port (3) and reflects between the first reflector (1) and the second reflector (2), finally exiting through the optical output port (4). This achieves a longer light path for the collimated light beam within a limited space, allowing for more reflections; the system has a simple structure, relatively simple optical adjustment, is easy to operate, and has stable performance, making it widely applicable in various detection environments.

An apparatus for focusing a beam of a high-power laser includes an optical configuration of two or more curved plasma mirrors configured to focus the beam of the high-power laser. When the optical configuration is arranged with respect to a main axis of the beam of the high-power laser, a first curved plasma mirror of the two or more curved plasma mirrors is arranged on the main axis of the beam of the high-power laser, and a second curved plasma mirror of the two or more curved plasma mirrors is arranged off-axis with respect to the main axis of the beam of the high-power laser, wherein the first curved plasma mirror is configured to reflect the beam of the high-power laser in the direction of the second curved plasma mirror of the two or more curved plasma mirrors.