The invention discloses an optical multiple-frequency
laser interference
system for a high-precision
absolute gravity meter. The optical multiple-frequency
laser interference
system comprises a frequency stabilized
laser, a collimation and beam expanding mirror, an adjustable reflector, a
beam splitter, a reference
prism, a faller
prism, a horizontal liquid level, a reflecting
prism, a diaphragm, a focusing lens and a photoelectric
detector, wherein laser is emitted by the frequency stabilized laser, after passing through collimation and beam expanding mirror vertically downwards transmitted after being reflected by the adjustable reflector, and then split into a
test light beam vertically downwards transmitted and a reference
light beam horizontally transmitted to the right by the
beam splitter, wherein the
test light beam is shot to the horizontal liquid level after being reflected by the reference prism and the faller prism for many times, then returns according to the original light path after being reflected to join with the reference
light beam to generate interference fringes, and the interference fringes pass through the opened diaphragm and are focused on the photoelectric
detector by the focusing lens. The invention also discloses an
absolute gravity meter adopting the
system. According to the optical multiple-frequency
laser interference system for the high-precision
absolute gravity meter and the application thereof, the test precision can be improved for multiple times, and the direction of the
test light beam can be simply and effectively adjusted to ensure that the direction is parallel to the direction of the gravity acceleration.