  Aditya-L1 is the first Indian space mission to explore the Sun and solar
atmosphere with seven multi-wavelength payloads, with Visible Emission Line
Coronagraph (VELC) being the prime payload. It is an internally occulted
coronagraph with four channels to image the Sun at 5000 \AA~ in the field of
view 1.05 - 3 \rsun, and to pursue spectroscopy at 5303 \AA, 7892 \AA~ and
10747 \AA~ channels in the FOV (1.05 - 1.5 \rsun). In addition,
spectropolarimetry is planned at 10747 \AA~ channel. Therefore, VELC has three
sCMOS detectors and one InGaAs detector. In this article, we aim to describe
the technical details and specifications of the detectors achieved by way of
thermo-vacuum calibration at the CREST campus of the Indian Institute of
Astrophysics, Bangalore, India. Furthermore, we report the estimated conversion
gain, full-well capacity, and readout noise at different temperatures. Based on
the numbers, it is thus concluded that it is essential to operate the sCMOS
detectors and InGaAs detectors at $-5^{\circ}$ and $-17^{\circ}$ C,
respectively, at the spacecraft level.
