# US 11,079,578 B1 · High performance telescope > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,079,578 B1 - Document ID: US11079578B1 - Status: Granted - Kind: B1 - Application number: 16/727,091 - Filed: 2019-12-26 - Published: 2021-08-19 - Granted: 2021-08-03 - Earliest claimed: 2019-12-26 - Assignees: Raytheon Company - Applicants: Raytheon Company - Inventors: Aaron Stonely; Stephen Felix Sagan; Brian M. Graue - Web page: https://patentgrep.com/patent/US11079578B1 ## CPC - G02B 7/1827: {Motorised alignment} - G02B 17/0642: {off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements} - G02B 13/14: for use with infrared or ultraviolet radiation ({G02B13/008, } G02B13/16 take precedence) - G02B 17/0631: {on-axis systems with at least one of the mirrors having a central aperture} - G02B 17/0647: {using more than three curved mirrors (G02B17/0668, G02B17/0694 take precedence)} - G02B 17/082: {using three curved mirrors (G02B17/0864, G02B17/0896 take precedence)} - G02B 17/0848: {off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements} - G02B 23/04: for the purpose of beam splitting or combining, e.g. fitted with eyepieces for more than one observer (G02B23/10 takes precedence) - G02B 26/06: for controlling the phase of light (G02B26/08 takes precedence {, measuring optical phase difference G01J9/00}) - G02B 26/0825: {the reflecting element being a flexible sheet or membrane, e.g. for varying the focus (flexible mirrors for cosmetic use A45D42/24)} - G02B 27/0068: {having means for controlling the degree of correction, e.g. using phase modulators, movable elements (controlling the phase of light using moving or deformable elements G02B26/06)} - G02B 23/06: having a focussing action, e.g. parabolic mirror - G02B 26/008: {in the form of devices for effecting sequential colour changes, e.g. colour wheels} - G02B 2207/117: Adjustment of the optical path length - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A telescope includes a primary mirror, a secondary mirror configured to move along a first axis, and a tertiary mirror configured to move along a second axis. The secondary and tertiary mirrors are configured to move along respective axes in a synchronized manner to focus a beam of electromagnetic radiation from the primary mirror. The telescope further may include an anamorphic deformable mirror configured to achieve wavefront control and correction of optical aberrations. The telescope further may include a first linear actuator configured to move the secondary mirror along the first axis and a second linear actuator configured to move the tertiary mirror along the second axis. ## Claims ### Claim 1 A telescope comprising: a primary mirror; a secondary mirror configured to move along a first axis; a first actuator configured to move the secondary mirror along the first axis; a tertiary mirror configured to move along a second axis; and a second actuator configured to move the tertiary mirror along the second axis, wherein the first actuator and the second actuator to move the secondary mirror and the tertiary mirror along respective axes in a synchronized manner to focus electromagnetic radiation from the primary mirror, wherein the telescope is configured to limit root mean square wavefront on-axis error below 0.15 waves @1.055 um over entire 0.3 km to infinity range. ### Claim 2 (depends on 1) The telescope of claim 1, further comprising an anamorphic deformable mirror configured to achieve wavefront control and correction of optical aberrations. ### Claim 3 (depends on 2) The telescope of claim 2, further comprising a fast steering mirror configured to reflect electromagnetic radiation from the deformable mirror to an off-axis parabolic objective. ### Claim 4 (depends on 3) The telescope of claim 3, wherein the fast steering mirror includes a reflective surface that is configured to be manipulated to control the direction of the reflection of electromagnetic radiation. ### Claim 5 (depends on 3) The telescope of claim 3, further comprising a combiner/beam splitter disposed between the fast steering mirror and the off-axis parabolic objective. ### Claim 6 (depends on 5) The telescope of claim 5, wherein the combiner/beam splitter is configured to direct a portion of electromagnetic radiation to a short-wave infrared imager. ### Claim 7 (depends on 6) The telescope of claim 6, wherein a remaining portion of electromagnetic radiation is directed from the off-axis parabolic objective optionally to at least one fold mirror. ### Claim 8 (depends on 7) The telescope of claim 7, wherein the at least one fold mirror, if provided, is configured to direct the remaining portion of electromagnetic radiation to a group of optical elements including an optical element. ### Claim 9 (depends on 8) The telescope of claim 8, wherein the optical element includes at least one of a focus element, a narrow/wide field of view group, a first wide field of view group and a second wide field of view group. ### Claim 10 (depends on 9) The telescope of claim 9, wherein the short-wave infrared imager includes a filter wheel. ### Claim 11 (depends on 2) The telescope of claim 2, wherein the telescope is configured to reduce vignetting by manipulating the anamorphic deformable mirror. ### Claim 12 (depends on 1) The telescope of claim 1, wherein the first actuator is a linear actuator configured to move the secondary mirror a travel range of 13 mm. ### Claim 13 (depends on 12) The telescope of claim 12, wherein the second actuator is a linear actuator configured to move the tertiary mirror a travel range of 50 mm. ### Claim 14 A method of directing electromagnetic radiation along an optical path of a telescope, the method comprising: directing electromagnetic radiation to a primary mirror configured to receive and reflect electromagnetic radiation along the optical path; directing electromagnetic radiation from the primary mirror to a secondary mirror configured to receive electromagnetic radiation from the primary mirror and to reflect electromagnetic radiation along the optical path; directing electromagnetic radiation from the secondary mirror to a tertiary mirror configured to receive electromagnetic radiation from the secondary mirror and to reflect electromagnetic radiation along the optical path; moving the secondary mirror along a first axis with a first actuator; and moving the tertiary mirror along a second axis with a second actuator, wherein the first actuator and the second actuator are configured to move the secondary mirror and the tertiary mirror along respective axes in a synchronized manner to focus electromagnetic radiation from the primary mirror, wherein the telescope is configured to limit root mean square wavefront on-axis error below 0.15 waves @1.055 um over entire 0.3 km to infinity range. ### Claim 15 (depends on 14) The method of claim 14, further comprising directing electromagnetic radiation from the tertiary mirror to an anamorphic deformable mirror configured to achieve wavefront control and correction of optical aberrations. ### Claim 16 (depends on 15) The method of claim 15, further comprising directing a portion of electromagnetic radiation from the deformable mirror to a short-wave infrared imager. ### Claim 17 (depends on 16) The method of claim 16, wherein directing a portion of electromagnetic radiation includes directing the portion of electromagnetic radiation to a fast steering mirror configured to reflect electromagnetic radiation from the deformable mirror to an off-axis parabolic objective. ### Claim 18 (depends on 17) The method of claim 17, further comprising positioning a combiner/beam splitter between the fast steering mirror and the off-axis parabolic objective, the combiner/beam splitter being configured to direct a portion of the beam of electromagnetic radiation to a short-wave infrared imager, with a remaining portion of the beam of electromagnetic radiation being directed from the off-axis parabolic objective optionally to at least one fold mirror.