![]() ![]() It is probable that to get the tenfold increase in resolution implied by the much larger diameter of this telescope would require higher frequency and more precise adjustment. To take advantage of its large size, in terms of angular resolution, the individual parts of the telescope have to be individually controlled/deformed at a continuous rate of $\sim 100$ Hz. However, a second big problem is that the air above the mirror is turbulent and the size of the turbulent cells is much smaller than the size of the telescope. ![]() It helps that you aren't going to move the primary, and you can still track objects for 1-2 hours by having instrumentation at a movable focus. ![]() This would entail the construction of literally millions of precisely configured mirror segments to tile the inside of the structure and then some way of pulling them all into position and alignment (and keeping them that way) with a precision of 10 nm or so. However, the difficulty and expense ramp up enormously when the working wavelength is 500 nm. If one is working in the FAST wavelength range of 10 cm to metres, then that is a relatively straightforward engineering problem, even over a km diameter. Finally, we describe the design of a laboratory breadboard that will image phase screens onto an exact replica of the space active mirror and show the results of measuring the phase screen accuracy.The surfaces of telescopes need to be configured to a fraction of a wavelength. A single-actuator prototype has been manufactured and used to test stroke, linearity, and hysteresis. Using end-to-end modeling, a 25-actuator mirror with polar actuator geometry, and a ratio of mechanical to optical pupil diameter of 2 has been chosen. We describe the modeling carried out to develop the active mirror design. Using Zemax, we demonstrate the feasibility of using this mirror to correct low-order Zernike aberrations and show that the aberration is well corrected across the 2.5 arcmin field of the telescope, operating at 0.55 μm. We have proposed a 4 m, two-mirror space telescope with an active optics system based on reimaging the telescope primary mirror onto a small active mirror (110 mm optical pupil). It is envisaged that future large space telescopes will be lightweight and employ active optics to maintain optical quality throughout the mission lifetime. Note: Author names will be searched in the keywords field, also, but that may find papers where the person is mentioned, rather than papers they authored.Use a comma to separate multiple people: J Smith, RL Jones, Macarthur.Use these formats for best results: Smith or J Smith.For best results, use the separate Authors field to search for author names.Use quotation marks " " around specific phrases where you want the entire phrase only.Question mark (?) - Example: "gr?y" retrieves documents containing "grey" or "gray".Asterisk ( * ) - Example: "elect*" retrieves documents containing "electron," "electronic," and "electricity".Improve efficiency in your search by using wildcards.Example: (photons AND downconversion) - pump.Example: (diode OR solid-state) AND laser.Note the Boolean sign must be in upper-case. Separate search groups with parentheses and Booleans.Keep it simple - don't use too many different parameters. ![]()
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