Overview of Instrumentation Programs for Infrared Spectroscopy at the U.Toronto
Dae-Sik Moon (Univ. of Toronto)(S. Sivanandam, E. Meyer, M. Millar-Blanchaer, J. Jilcote, J. Miranda, ……)
Three Key Elements of Spectrographs
Field of View(Multiplexing)
Spectral Coverage
Spectral Resolution
They are incompatible, competing for (limited) number of detector pixles.
I Want Them All
Three Key Elements of Spectrographs
Field of View(Multiplexing)
Spectral Coverage
By former U.Toronto student R. Chou (WIFIS Optical Design)
Spectral Resolution
I Want Them All
Three Key Elements of Spectrographs
Field of View(Multiplexing)
Spectral Coverage
Pixels are pricy and also noisy.Oversampling doesn’t help.
Spectral Resolution
At the University of Toronto:
x Field of View/Multiplexing:Wide Integral Field Infrared Spectrograph (PI)Micro-shutter Array Multi-object Spectrograph (PI) x Broad Spectral Coverage:
Near-Infrared Echelle Spectrograph (& TripleSpec) (co-I)Development of Polarization Grating Based BroadbandSpectroscopic Technique (PI)
NFIRAOS Science Calibration Unit for TMT (PI)(TMT IRMOS, 2005 co-proposer)
Wide Integral Field Infrared Spectrograph (WIFIS)
Current Near-Infrared Integral Field Spectrographs
Wide Integral Field Infrared Spectrograph (WIFIS)
Current Near-Infrared Integral Field Spectrographs
WIFIS
Wide Integral Field Infrared Spectrograph (WIFIS)
Developed mostly by students and postdocs at the U.Toronto, starting from optical design …
See presentation by S. Sivanandam for details.
Telescope Focal Plane
Detector
Long slit or Multi-slit mask
Slit mask design
Dispersed Image
Multi-object spectroscopy is now essential and standard in the optical. How about infrared?
Fully addressable NIR Multi-object Spectroscopy
NIR Multi-object Spectroscopy: The MOSFIRE way
Using cryogenic slit mechanism for seeing-limited observations.
NIR Multi-object Spectroscopy: The Microshutter Array way
Using the MEMS Microshutter Array (acting as a source selector) developed for JWST in ground-based AO NIR multi-object spectroscopy o MSAMOS
See presentation by S. Sivanandam for details.
Cross-dispersed Echelle Spectrographs fro Broad Spectral Coverage:NIRES on Keck / Triplespec on Palomar
Cross-dispersed Echelle Spectrographs fro Broad Spectral Coverage:NIRES on Keck / Triplespec on Palomar
High-z objects, SNe/GRBs, Highly Obscured Objects, New objects, etc.
Polarization Gratings for High-Throughput Broadband Visible-Infrared Spectroscopy (collaboration with EE@NCSU; M. Escuti)
Difficult to make high-throughput gratings covering broad spectral range based on conventional methods (e.g., ruled surface)
Polarization Gratings for High-Throughput Broadband Visible-Infrared Spectroscopy (collaboration with EE@NCSU; M. Escuti)
Polarization gratings of nano-scale structure can diffract all the light into just two orders (r1)o
High-throughput broadband spectroscopy
Development at the U.Toronto
Laboratory test (Millar-Blanchaer)
Prototype astronomical spectrograph for visible waveband (being developed).Prototype astronomical spectrograph for visible-infrared waveband (being designed).
TMT Science Calibration Unit for Adaptive Optics and Near-Infrared Instruments
Moon et al. (2010)
Flat fielding, wavelength calibration, pupil tracking.
At the University of Toronto:
x Field of View/Multiplexing:- Wide Integral Field Infrared Spectrograph (PI)- Micro-shutter Array Multi-object Spectrograph (PI) x Broad Spectral Coverage:
- Near-Infrared Echelle Spectrograph (& TripleSpec) (co-I)- Development of Polarization Grating Based Broadband
Spectroscopic Technique (PI)
NFIRAOS Science Calibration Unit for TMT (PI)(TMT IRMOS, 2005 proposal)