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We have recently commissioned a novel infrared ($0.9-1.7$ $\mu$m) integralfield spectrograph (IFS) called the Wide Integral Field Infrared Spectrograph(WIFIS). WIFIS is a unique instrument that offers a very large field-of-view(50$^{\prime\prime}$ x 20$^{\prime\prime}$) on the 2.3-meter Bok telescope atKitt Peak, USA for seeing-limited observations at moderate spectral resolvingpower. The measured spatial sampling scale is $\sim1\times1^{\prime\prime}$ andits spectral resolving power is $R\sim2,500$ and $3,000$ in the $zJ$($0.9-1.35$ $\mu$m) and $H_{short}$ ($1.5-1.7$ $\mu$m) modes, respectively.WIFIS's corresponding etendue is larger than existing near-infrared (NIR)IFSes, which are mostly designed to work with adaptive optics systems andtherefore have very narrow fields. For this reason, this instrument isspecifically suited for studying very extended objects in the near-infraredsuch as supernovae remnants, galactic star forming regions, and nearbygalaxies, which are not easily accessible by other NIR IFSes. This enablesscientific programs that were not originally possible, such as detailed surveysof a large number of nearby galaxies or a full accounting of nucleosyntheticyields of Milky Way supernova remnants. WIFIS is also designed to be easilyadaptable to be used with larger telescopes. In this paper, we report on theoverall performance characteristics of the instrument, which were measuredduring our commissioning runs in the second half of 2017. We presentmeasurements of spectral resolving power, image quality, instrumentalbackground, and overall efficiency and sensitivity of WIFIS and compare themwith our design expectations. Finally, we present a few example observationsthat demonstrate WIFIS's full capability to carry out infrared imagingspectroscopy of extended objects, which is enabled by our custom data reductionpipeline.

The Wide Integral Field Infrared Spectrograph: Commissioning Results and On-sky Performance