Pulsed laser, Tetrahertz generating device, and a measuring device tetrahertz terahertz tomography

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A pulse laser apparatus includes a laser (1; 4; 50) configured to generate a pulse of a laser beam, a fiber amplifier (2; 9), and a pulse compressor (3; 14, 15). The fiber amplifier includes a rare-earth doped fiber (41) that exhibits normal dispersion at a wavelength of the laser beam generated from the laser. The pulse laser apparatus further includes a unit configured to give a loss to energy portions in a wavelength region corresponding to a zero-dispersion wavelength of the rare-earth doped fiber and/or a wavelength region longer than the zero-dispersion wavelength within a wavelength spectrum of the laser beam having been chirped in the fiber amplifier.