Performance analysis of the adaptive secondary mirror for the UH2.2 telescope

Kuiper, Stefan; Jonker, Wouter; Maniscalco, Matthew; Ven, E. van der; Voorhoeve, Robbert; Chun, Mark; Lai, O.; Lu, Jessica R.

doi:10.1117/12.2562461

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…In the context of medium-aperture telescopes, we first demonstrated the feasibility of piezoelectric DSM (PDSM) in 2016 for astronomical observation. We developed a 73-actuator PDSM and used it in the 1.8-m telescope for on-sky experiment 14,15 . The structure of the PDSM is much simpler than the VCDSM, in which no additional position sensor, local electronics or active thermal control is required.…”

Section: Introductionmentioning

confidence: 99%

High-resolution visible imaging with piezoelectric deformable secondary mirror: experimental results at the 1.8-m adaptive telescope

Guo,

Chen,

Zhou

et al. 2023

OEA

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Integrating deformable mirrors within the optical train of an adaptive telescope was one of the major innovations in astronomical observation technology, distinguished by its high optical throughput, reduced optical surfaces, and the incorporation of the deformable mirror. Typically, voice-coil actuators are used, which require additional position sensors, internal control electronics, and cooling systems, leading to a very complex structure. Piezoelectric deformable secondary mirror technologies were proposed to overcome these problems. Recently, a high-order piezoelectric deformable secondary mirror has been developed and installed on the 1.8-m telescope at Lijiang Observatory in China to make it an adaptive telescope. The system consists of a 241-actuator piezoelectric deformable secondary mirror, a 192-sub-aperture Shack-Hartmann wavefront sensor, and a multi-core-based real-time controller. The actuator spacing of the PDSM measures 19.3 mm, equivalent to approximately 12.6 cm when mapped onto the primary mirror, significantly less than the voicecoil-based adaptive telescopes such as LBT, Magellan and VLT. As a result, stellar images with Strehl ratios above 0.49 in the R band have been obtained. To our knowledge, these are the highest R band images captured by an adaptive telescope with deformable secondary mirrors. Here, we report the system description and on-sky performance of this adaptive telescope.

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Section: Introductionmentioning

confidence: 99%

High-resolution visible imaging with piezoelectric deformable secondary mirror: experimental results at the 1.8-m adaptive telescope

Guo,

Chen,

Zhou

et al. 2023

OEA

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Status and first results of the NASA IRTF adaptive secondary mirror

Bos,

Dekker,

Baeten

et al. 2024

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI

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TNO and partners at University of Hawai'i (UH), the NASA InfraRed Telescope Facility (IRTF), and the Center for Adaptive Optics (CfAO) at UCSC have been working on the realization of a 244 mm Adaptive Secondary Mirror (ASM) for the NASA IRTF called the IRTF-ASM-1. After successful performance testing of several laboratory prototypes, this project provided the first on-sky demonstration of TNO's ASM technology at M2 location with an optically powered mirror shell.The ASM is designed to retrofit the current passive M2. The ASM consists of a 244mm-diameter slumped convex aspherical mirror shell, manipulated by 36 hybrid variable reluctance actuators mounted on a light-weighted backing structure. The mirror shell is manufactured to the required accuracy at reduced cost through slumping by UCSC. The mirror shell is finished to final figure with Magnetorheological Finishing (MRF) by TNO before it was coated.The ASM was shipped to UH in Hilo in February 2024, where performance was tested in the lab. The IRTF ASM saw 'first light' on telescope on the 23 rd of April, already achieving stable closed-loop performance that was diffraction limited at the H-band (1.62 microns) with a long-exposure Strehl ratio of 35%-40% in sub-arcsecond seeing during the first night. This paper will report on the status and first results of the IRTF ASM, including the latest status of the deformable mirror technology at TNO and an outlook to a second generation IRTF ASM with improved dynamic performance and increased actuator count.

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Performance analysis of the adaptive secondary mirror for the UH2.2 telescope

Cited by 2 publications

References 4 publications

High-resolution visible imaging with piezoelectric deformable secondary mirror: experimental results at the 1.8-m adaptive telescope

High-resolution visible imaging with piezoelectric deformable secondary mirror: experimental results at the 1.8-m adaptive telescope

Status and first results of the NASA IRTF adaptive secondary mirror

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