A 2 2 array of YBa 2 Cu 3 O 7 (YBaCuO) transition edge bolometers has been fabricated on an MgO substrate. The bolometers are of the meander type with line width and line spacing of 40 m. The meander length of a single bolometer is 12.5 mm, covering an area of 1 mm 1 mm. The voltage responsivity of each pixel, at 10 m wavelength, has been studied as a function of modulation frequency. The array exhibits a uniform response and an electrical noise equivalent power (NEP) of 4.2 10 12 W/ Hz or an optical NEP of 1 10 9 W/ Hz. Thermal crosstalk between adjacent pixels has been also studied and first imaging results are presented.

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