Optical system for holographic storage and design method for fresnel lens and meta lens thereof

An optical system for holographic storage, comprising a reference light path, a signal light path, a servo light path and a reproduction light path,

• wherein the reference light path and the signal light path both contains a first Fourier lens and a second Fourier lens for transmitting a reference light and a signal light carrying data information, and adjusting an incident position and angle of the reference light and the signal light on a storage medium,
• wherein the optical system further comprises:
• a reference light objective lens for converging the reference light;
• a third Fourier lens for performing Fourier transformation on a signal light field;
• and
• a fourth Fourier lens for performing Fourier transformation on a reproduced signal light field to read the data information, and
• wherein the first Fourier lens, the second Fourier lens, the third Fourier lens, the fourth Fourier lens and the reference light objective lens is respectively composed of a Fresnel lens or a meta lens.