A zoom lens includes, in order from an object side, a first lens group G1 having a positive focal length, a second lens group G2 having a negative focal length, a third lens group G3 including an aperture stop S and having a positive focal length, a fourth lens group G4 having a negative focal length, and a rear side lens group G5. The first lens group includes a negative lens and a positive lens disposed in order from a most object side. The first lens group and the third lens group are fixed in power varying from a wide angle end to a telephoto end. The second lens group moves from the object side to an image side in the power varying. The zoom lens satisfies following conditional expressions (1) and (2).

2.1≤F1/Fw≤3.0   (1)

−1.2≤F3/F2≤−0.8  (2)

A zoom lens L0 consists of a first lens unit L1 having negative refractive power, a middle group Lm including one or more lens units, and a last lens unit having positive refractive power. The first lens unit L1 includes a first negative lens, a second negative lens, and a third negative lens that are arranged sequentially in an order from an object side to an image side. The number of negative lenses included in the first lens unit L1 is four or less. The middle group Lm includes a plurality of cemented lenses each having a cemented surface that is convex toward the object side, and includes a lens element Ln that is disposed closest to the image side among lens elements having negative refractive power included in the middle group Lm. The zoom lens L0 satisfies a predetermined inequality.

The disclosure describes various aspects of techniques for elliptical beam design using cylindrical optics that may be used in different applications, including in quantum information processing (QIP) systems. In an aspect, the disclosure describes an optical system having a first optical component having a first focal length, a second optical component having a second focal length and aligned with a first direction, and a third optical component having a third focal length and aligned with a second direction orthogonal to the first direction. The optical system is configured to receive one or more optical beams (e.g., circular or elliptical) and apply different magnifications in the first direction and the second direction to the one or more optical beams to image one or more elliptical Gaussian optical beams. A method for generating elliptical optical beams using a system as the one described above is also disclosed.

An optical system includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a first focus lens unit having a negative refractive power, and a second focus lens unit having a positive refractive power. The first lens unit is fixed during focusing. The first focus lens unit and the second focus lens unit move so that a distance between the first focus lens unit and the second focus lens unit changes during focusing. The first lens unit includes a single lens which is disposed closest to an object and has a negative refractive power. A predetermined condition is satisfied.

A zoom optical system according to an embodiment of the present invention includes a first lens group, a second lens group, a third lens group, and a fourth lens group which are sequentially disposed in a direction from an object side to an image side, wherein the second lens group and the third lens group are movable, a total track length (TTL) is less than 20 mm, and an effective focal length (EFL) in a telephoto is greater than 25 mm.

An imaging apparatus includes a first optical system, a first separation optical system that separates the light transmitted through the first optical system into the first wavelength range light and the second wavelength range light, a second optical system that transmits the first wavelength range light obtained by the first separation optical system, a third optical system that transmits the second wavelength range light obtained by the first separation optical system, a first image sensor that receives the first wavelength range light, a second image sensor that receives the second wavelength range light, and a first light source that emits the first wavelength range light, in which the first optical system emits the first wavelength range light emitted from the first light source to a subject, and transmits subject light including first wavelength range reflected light obtained by reflecting the first wavelength range light by the subject.

An imaging apparatus includes a first optical system, a first separation optical system that separates the light transmitted through the first optical system into the first wavelength range light and the second wavelength range light, a second optical system that transmits the first wavelength range light obtained by the first separation optical system, a third optical system that transmits the second wavelength range light obtained by the first separation optical system, a first image sensor that receives the first wavelength range light, a second image sensor that receives the second wavelength range light, and a first light source that emits the first wavelength range light, in which the first optical system emits the first wavelength range light emitted from the first light source to a subject, and transmits subject light including first wavelength range reflected light obtained by reflecting the first wavelength range light by the subject.

An adjustable teleconverter is provided that may be selectively adjusted between a base lens configuration and one or more tele-lens configurations without adding, removing, or replacing lenses from an optical system. In one example, a system includes a front lens group configured to form a first image at an intermediate image plane in response to radiation from a scene. The system also includes a teleconverter configured to project the first image to form a second image at a final image plane. The teleconverter comprises a relay lens group configured to be selectively positioned between the intermediate image plane and the final image plane to adjust a magnification of the second image. Additional methods, devices, and systems are also provided.

The present disclosure is directed to an optical system internally having an intermediate imaging position that is conjugated to a magnification conjugate point on a magnification side and a reduction conjugate point on a reduction side, respectively, the optical system comprising: a magnification optical system positioned on the magnification side with respect to the intermediate imaging position; and a relay optical system positioned on the reduction side with respect to the intermediate imaging position; the relay optical system including: a first lens group positioned closest to the magnification side; two lens groups positioned on the reduction side with respect to the first lens group; and a negative lens group interposed between the two lens groups, wherein during zooming the negative lens is fixed, while the two lens groups are displaced.

A variable magnification projection optical system includes, in order from an enlargement side: a first lens group having negative refractive power; a second lens group having negative refractive power; and a third lens group having positive refractive power. During zooming, the first lens group is fixed, and the second lens group and the third lens group move. The second lens group includes a plurality of lenses each having positive refractive power. All lenses each having positive refractive power in the first lens group and the second lens group are made of a glass material having a transmittance greater than 0.98 per thickness of 10 mm with respect to light having a wavelength of 440 nm.