We present an enhanced scheme of polarization-sensitive THz-ABCD which can provide about twice broader
bandwidth than the conventional method. In our experiment using a 26 fs laser pulse, compared with 0.3~40 THz in the
conventional scheme, bandwidth coverage from 0.3 to 80 THz has been achieved in the resolution-enhanced scheme. It
also should have to be noted the terahertz source may also restrict the detection bandwidth. Employing the polarizationsensitive
technology, the polarization in time domain, as well as the field amplitude, can be achieved with just one single
We have generated a narrow line-width T-ray continuously tunable in the range of 0.5~4 THz by the different frequency
generation in a GaSe crystal with a collinear phase-matched configuration. The peak power at 3.07 THz reaches 17.3 W,
and the measured line width is less than 0.3cm<sup>-1</sup>.