Mr. Christopher T. Ratliff Profile

Christopher T. Ratliff

at Univ of California Observatories

SPIE Involvement:

Author

Publications (21)

Proceedings Article | 26 August 2024 Poster + Paper

Design of a precision cryogenic rotary stage for optic or mask selection for the SCALES instrument mounted to the Keck 2 Telescope

C. Ratliff, N. MacDonald, J. Cabak, W. Deich, D. Sandford, M. Gonzales, A. Skemer, S. Sallum, D. Stelter, A. Hunter, R. Kupke, D. Dillon, D. Marques, C. Rodriguez, M. Savage, M. Kassis, J. Lyke, A. Hasan

Proceedings Volume 13100, 131006X (2024) https://doi.org/10.1117/12.3020421

KEYWORDS: Design, Mirrors, Optical surfaces, Cryogenics, Aluminum, Mirror surfaces, Telescopes, Equipment, Finite element methods, Vacuum

Read Abstract +

Proceedings Article | 26 August 2024 Presentation + Paper

The calibration and verification equipment (CAVE) for KASM

Renate Kupke, Philip Hinz, Daren Dillon, Aaron Hunter, Matthew Radovan, Christopher Ratliff, Maureen Savage

Proceedings Volume 13100, 131000T (2024) https://doi.org/10.1117/12.3020821

KEYWORDS: Actuators, Telescopes, Mirrors, Wavefront sensors, Calibration, Metrology, Adaptive mirrors

Read Abstract +

Proceedings Article | 14 August 2024 Poster + Paper

Static optic mount design and fabrication for infrared astronomy on SCALES instrument

Cristian Rodriguez, Christopher Ratliff, Nicholas MacDonald, Renate Kupke, Daren Dillon, Isabel Kain, R. Deno Stelter, Andy Skemer

Proceedings Volume 13096, 1309670 (2024) https://doi.org/10.1117/12.3019516

KEYWORDS: Optics manufacturing, Equipment, Design, Mirrors, Computer aided design, Aluminum, Optical surfaces, Titanium, Optical alignment, Manufacturing

Read Abstract +

Proceedings Article | 19 July 2024 Poster

Cryogenic test results of first SCALES rotary stage

Michael Gonzales, Deno Stelter, Christopher Ratliff, Dale Sandford, William Deich, Aaron Hunter, Nicholas MacDonald, Gerald Cabak, David Black, Andrew Skemer

Proceedings Volume 13096, 130966Z (2024) https://doi.org/10.1117/12.3020851

Read Abstract +

Proceedings Article | 18 July 2024 Presentation + Paper

SCALES status report

R. Deno Stelter, Andrew Skemer, Stephanie Sallum, Nick MacDonald, Renate Kupke, Christopher Ratliff, Cyril Bourgenot, Gerald Cabak, Michael Gonzales, Cristian Rodriguez, Aaron Hunter, Ravinder Banyal, Thirupathi Sivarani, Michael Fitzgerald, Marc Kassis, Olivier Absil, Carlos Alvarez, Natatsha Batalha, Marc-André Boucher, Timothy Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, William Deich, Devika Dicakar, Étienne Gauvin, Thomas Greene, Armirul Hasan, Philip Hinz, Rebecca Jensen-Clem, Christopher Johnson, Govinda K. V., Isabel Kain, Mackenzie Lach, Jean-Thomas Landry, Michael Liu, Jim Lyke, Kenneth Magone, Eduardo Marin, Raquel Martinez, Dimitri Mawet, Rosalie McGurk, Brittany Miles, Ajin Parkash, Dale Sandford, Ramya Sethuram, Patrick Sheehan, Ji Man Sohn, Jordan Stone, Arun Surya, Hari Varshney, Eric Wang

Proceedings Volume 13096, 1309619 (2024) https://doi.org/10.1117/12.3020806

KEYWORDS: Mirrors, Cryostats, Coronagraphy, Spectrographs, Telescopes, Imaging systems, Exoplanets

Read Abstract +

Proceedings Article | 5 October 2023 Poster + Paper

Characterization of diamond-turned optics for SCALES

Isabel Kain, Phil Hinz, Marius Doetz, Benjamin Bulla, Renate Kupke, Daren Dillon, Andrew Skemer, Deno Stelter, Michael Gonzales, Nicholas MacDonald, Aditi Gangadharan, Cristian Rodriguez, Christopher Ratliff, Mackenzie Lach, Steph Sallum

Proceedings Volume 12680, 1268020 (2023) https://doi.org/10.1117/12.2677716

KEYWORDS: Adaptive optics, Point spread functions, Wavefront errors, Optical surfaces, Spatial frequencies, Optics manufacturing, Surface roughness, Mirror surfaces

Read Abstract +

Proceedings Article | 30 August 2022 Poster + Paper

Preliminary lab demonstration of a 3-sided reflective pyramid wavefront sensor for Shane AO using SEAL testbed

Dominic Sanchez, Philip Hinz, Mark Chun, Christopher Ratliff, Daren Dillon, Charlotte Bond

Proceedings Volume 12185, 121858F (2022) https://doi.org/10.1117/12.2630724

KEYWORDS: Adaptive optics, Modulation, Wavefront sensors, Telescopes, Device simulation, Reflectivity, Point spread functions, Sensors, Prisms, Optomechanical design

Read Abstract +

Proceedings Article | 29 August 2022 Presentation + Paper

Design of an IR imaging channel for the Keck Observatory SCALES instrument

Ravinder K. Banyal, Armirul Hasan, Reni Kupke, Hari Mohan Varshney, Ajin Prakaesh, T. Sivarani, Andy J. Skemer, Nick MacDonald, Steph Sallum, Will Deich, Michael P. Fitzgerald, K. V. Govinda, Chris Ratliff, Ramya Sethuram, Deno Stelter, Arun Surya, Eric Wang

Proceedings Volume 12188, 121881U (2022) https://doi.org/10.1117/12.2630696

KEYWORDS: Imaging systems, Sensors, Mirrors, Iterated function systems, Exoplanets, Image filtering, Computer aided design, Coronagraphy, Telescopes, Adaptive optics

Read Abstract +

Proceedings Article | 29 August 2022 Presentation + Paper

Design of SCALES: a 2-5 micron coronagraphic integral field spectrograph for Keck Observatory

Andrew Skemer, R. Deno Stelter, Stephanie Sallum, Nicholas MacDonald, Renate Kupke, Christopher Ratliff, Ravinder Banyal, Amirul Hasan, Hari Mohan Varshney, Arun Surya, Ajin Prakaesh, Sivarani Thirupathi, Ramya Sethuram, Govinda K.V., Michael Fitzgerald, Eric Wang, Marc Kassis, Olivier Absil, Carlos Alvarez, Natasha Batalha, Marc-André Boucher, Cyril Bourgenot, Timothy Brandt, Zackery Briesemeister, Katherine de Kleer, Imke de Pater, William Deich, Devika Divakar, Guillaume Filion, Étienne Gauvin, Michael Gonzales, Thomas Greene, Philip Hinz, Rebecca Jensen-Clem, Christopher Johnson, Isabel Kain, Gabriel Kruglikov, Mackenzie Lach, Jean-Thomas Landry, Jialin Li, Michael Liu, James Lyke, Kenneth Magnone, Eduardo Marin, Emily Martin, Raquel Martinez, Dimitri Mawet, Brittany Miles, Dale Sandford, Patrick Sheehan, Ji Man Sohn, Jordan Stone

Proceedings Volume 12184, 121840I (2022) https://doi.org/10.1117/12.2630577

KEYWORDS: Exoplanets, Spectrographs, Planets, Sensors, Coronagraphy, Imaging systems, Adaptive optics, Mirrors, Spectroscopy

Read Abstract +

Proceedings Article | 29 August 2022 Paper

SCALES on Keck: optical design

Renate Kupke, R. Deno Stelter, Amirul Hasan, Arun Surya, Isabel Kain, Zackery Briesemeister, Jialin Li, Phil Hinz, Andrew Skemer, Benjamin Gerard, Daren Dillon, Christopher Ratliff

Proceedings Volume 12184, 121844A (2022) https://doi.org/10.1117/12.2630642

KEYWORDS: Spectrographs, Imaging systems, Coronagraphy, Adaptive optics, Optical design, Relays, Spectral resolution

Read Abstract +

Proceedings Article | 9 September 2021 Poster + Paper

Cryogenic test results of the SCALES focal plane coronagraph mechanism

Michael Gonzales, R. Deno Stelter, Gabriel Kruglikov, Christopher Ratliff, William Deich, Nicholas MacDonald, Steph Sallum, Andrew Skemer

Proceedings Volume 11823, 118231W (2021) https://doi.org/10.1117/12.2594801

KEYWORDS: Switches, Coronagraphy, Cryogenics, Adaptive optics, Exoplanets, Reliability, Motion measurement, Mirrors, Computer programming, Software development

Read Abstract +

Proceedings Article | 13 December 2020 Poster + Paper

Update on the preliminary design of SCALES: the Santa Cruz Array of Lenslets for Exoplanet Spectroscopy

R. Deno Stelter, Andrew Skemer, Steph Sallum, Renate Kupke, Phil Hinz, Dimitri Mawet, Rebecca Jensen-Clem, Christopher Ratliffe, Nicholas MacDonald, William Deich, Gabriel Kruglikov, Marc Kassis, Jim Lyke, Zackary Briesemeister, Brittany Miles, Benjamin Gerard, Michael Fitzgerald, Timothy Brandt, Christian Marois

Proceedings Volume 11447, 1144764 (2020) https://doi.org/10.1117/12.2562768

KEYWORDS: Exoplanets, Imaging systems, Imaging spectroscopy, Spectroscopy, Planetary systems, Iterated function systems, Spectrographs, Spectral resolution, Coronagraphy, Keck Observatory

Read Abstract +

Proceedings Article | 10 July 2018 Presentation + Paper

Fabrication completion and commissioning of a deployable tertiary mirror for the Keck I Telescope

C. Ratliff, G. Cabak, A. Phillips, X. Prochaska, W. Deich, D. Sandford, J. Nelson, D. Cowley, A. Tripsas, M. Bolte, S. Park, M. Peck, P. Zachary, T. Wold, M. Dahler, M. Kassis, A. Vandenberg, J. Ward

Proceedings Volume 10706, 1070611 (2018) https://doi.org/10.1117/12.2312207

KEYWORDS: Mirrors, Telescopes, Kinematics, Actuators, Computer aided design, Adaptive optics, Control systems, Collimation, Servomechanisms, Computer programming

Read Abstract +

Proceedings Article | 1 August 2016 Paper

Update on UCO's advanced coating lab development of silver-based mirror coatings

Andrew Phillips, David Fryauf, Nobuhiko Kobayashi, Brian DuPraw, Spencer Cheleden, Christopher Ratliff, Michael Bolte, David Cowley

Proceedings Volume 9912, 99122G (2016) https://doi.org/10.1117/12.2233009

KEYWORDS: Atomic layer deposition, Silver, Mirrors, Observatories, Telescopes, Oxides, Coating, Mirrors, Reflectivity, Aluminum, Silica

Read Abstract +

Proceedings Article | 15 July 2016 Paper

Detailed design of a deployable tertiary mirror for the Keck I telescope

J. Xavier Prochaska, Chris Ratliff, Jerry Cabak, Alex Tripsas, Sean Adkins, Michael Bolte, David Cowley, Mike Dahler, Will Deich, Hilton Lewis, Jerry Nelson, Sam Park, Michael Peck, Drew Phillips, Mike Pollard, Bill Randolph, Dale Sandford, Jim Ward, Truman Wold

Proceedings Volume 9910, 99102I (2016) https://doi.org/10.1117/12.2233237

KEYWORDS: Mirrors, Telescopes, Astronomy, Calibration, Sensors, Distortion, Data modeling, Spectroscopy, James Webb Space Telescope, Magnetic resonance imaging

Read Abstract +

Proceedings Article | 7 August 2014 Paper

Swimming with ShARCS: comparison of on-sky sensitivity with model predictions for ShaneAO on the Lick Observatory 3-meter telescope

Srikar Srinath, Rosalie McGurk, Constance Rockosi, Renate Kupke, Donald Gavel, Gerald Cabak, David Cowley, Michael Peck, Christopher Ratliff, Elinor Gates, Daren Dillon, Andrew Norton, Marc Reining

Proceedings Volume 9148, 91482Z (2014) https://doi.org/10.1117/12.2055672

KEYWORDS: Telescopes, Adaptive optics, Observatories, Signal to noise ratio, Sensors, Imaging systems, Infrared cameras, Mirrors, Photons, Stars

Read Abstract +

Proceedings Article | 22 July 2014 Paper

Design development of a deployable tertiary mirror for Keck

J. Prochaska, J. Cabak, C. Ratliff, S. Adkins, M. Bolte, D. Cowley, H. Epps, J. Nelson, A. Tripsas, A. Phillips, W. Deich, M. Peck

Proceedings Volume 9145, 91453X (2014) https://doi.org/10.1117/12.2055275

KEYWORDS: Mirrors, Telescopes, Kinematics, Observatories, Stars, Adaptive optics, Vignetting, Actuators, Astronomy, Spectrometers

Read Abstract +

Proceedings Article | 21 July 2014 Paper

Opto-mechanical design of ShaneAO: the adaptive optics system for the 3-meter Shane Telescope

C. Ratliff, J. Cabak, D. Gavel, R. Kupke, D. Dillon, E. Gates, W. Deich, J. Ward, D. Cowley, T. Pfister, M. Saylor

Proceedings Volume 9148, 91483B (2014) https://doi.org/10.1117/12.2057064

KEYWORDS: Adaptive optics, Telescopes, Microelectromechanical systems, Cameras, Aluminum, Wavefront sensors, Optical benches, Optomechanical design, Mirrors, Deformable mirrors

Read Abstract +

Proceedings Article | 21 July 2014 Paper

ShaneAO: wide science spectrum adaptive optics system for the Lick Observatory

Donald Gavel, Renate Kupke, Daren Dillon, Andrew Norton, Chris Ratliff, Jerry Cabak, Andrew Phillips, Connie Rockosi, Rosalie McGurk, Srikar Srinath, Michael Peck, William Deich, Kyle Lanclos, John Gates, Michael Saylor, Jim Ward, Terry Pfister

Proceedings Volume 9148, 914805 (2014) https://doi.org/10.1117/12.2055256

KEYWORDS: Adaptive optics, Stars, Wavefront sensors, Sensors, Electroluminescent displays, Point spread functions, Imaging systems, Telescopes, Cameras, Observatories

Read Abstract +

Proceedings Article | 18 July 2014 Paper

Progress and new techniques for protected-silver coatings

Andrew Phillips, David Fryauf, Nobuhiko Kobayashi, Michael Bolte, Brian Dupraw, Christopher Ratliff, Terry Pfister, David Cowley

Proceedings Volume 9151, 91511B (2014) https://doi.org/10.1117/12.2055706

KEYWORDS: Silver, Atomic layer deposition, Reflectivity, Optical coatings, Telescopes, Mirrors, Observatories, Oxides, Tin, Silicon

Read Abstract +

Proceedings Article | 13 September 2012 Paper

ShaneAO: an enhanced adaptive optics and IR imaging system for the Lick Observatory 3-meter telescope

Renate Kupke, Donald Gavel, Constance Roskosi, Gerald Cabak, David Cowley, Daren Dillon, Elinor Gates, Rosalie McGurk, Andrew Norton, Michael Peck, Christopher Ratliff, Marco Reinig

Proceedings Volume 8447, 84473G (2012) https://doi.org/10.1117/12.926470

KEYWORDS: Adaptive optics, Telescopes, Laser guide stars, Deformable mirrors, Wavefront sensors, Sensors, Cameras, Observatories, Mirrors, Imaging systems

Read Abstract +

Showing 5 of 21 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years