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We propose and experimentally prove efficient high-resolution electro-opticsampling measurement of broadband terahertz waveforms in a LiNbO$_3$ crystal inthe configuration with the probe laser beam propagating along the optical axisof the crystal. This configuration allows one to avoid the detrimental effectof strong intrinsic birefringence of LiNbO$_3$ without any additional opticalelements. To achieve velocity matching of the terahertz wave and the probebeam, the terahertz wave is introduced into the crystal through a Si prism atthe Cherenkov angle to the probe beam. The workability of the scheme atdifferent wavelengths of the probe optical beam (800 and 1550 nm) isdemonstrated.

Noncollinear electro-optic sampling detection of terahertz pulses in a LiNbO$_3$ crystal with avoiding the effect of intrinsic birefringence