Optical device and optical method for quickly detecting biological liquid sample

The invention discloses an optical device and optical method for quickly detecting a biological liquid sample. The optical device for quickly detecting the biological liquid sample comprises a mode locking Ti sapphire femtosecond laser, a time delay device, gallium arsenide crystals, zinc telluride crystals, a high-speed photoelectric probe, a 780 nm beam splitter, a first 780 nm total reflective mirror, a second 780 nm total reflective mirror, a first focusing lens, a second focusing lens, a first paraboloidal mirror, a second paraboloidal mirror, terahertz spectrum and a sample groove, wherein the time delay device comprises the first 780 nm total reflective mirror and the second 780 nm total reflective mirror perpendicular to each other, and is fixed on a motorized translation stage.