Shigetake Iwata

Holographic straight-line scanner using a holoplate

Since a hologram can simultaneously scan and focus a laser beam, we have investigated the use of a holographic line scanner in laser printers. However, conventional holographic scanners, suffer from wavelength shifts of laser diodes. To prevent problems caused by wavelength shifts, a conventional holographic scanner needs an expensive thermal controller for a laser diode or a frequency-stabilized laser diode. To achieve a low cost scanner, we proposed a new holographic scanner using a holoplate that compensates for large wavelength shifts. In this paper, we will discuss the wavelength shift compensation of a new scanner.

Compact Holographic Disk In All Holographic Line Scanner For Diode Laser Printers

We have developed a compact holographic disk for an all holographic line scanner for diode laser printers. The scanner consists of only a holographic disk and a holographic lens for laser scanning and focusing. No other optics are necessary. The holographic disk performs straight line scanning. The optical power is achieved by a holographic disk and lens. To make the disk more compact, while retaining a required scanning width and scanning beam, the increasing of deviation from a straight line and scanning beam aberration need be overcome. In this paper, we investigate the required phase transfer functions of the holograms to realize the compact holographic disk.

All Holographic Line Scanner For Use In Diode Laser Printers

We have developed an all holographic line scanner for use in diode laser printers. The scanner consists of only a holographic disk and a holographic lens for laser scanning and focusing. No other optics such as a collimating lens and f- θ lens are necessary. The holographic disk performs high precision straight line scanning. The focusing function is achieved by the compound optical power of a holographic disk and lens. To make the disk more compact, while retaining a required scanning width and scanning beam, the increasing deviation from a straight line and scanning beam aberration need be overcome. In this paper, we devised the method to obtain the required phase transfer functions of the holograms and discussed the holographic recording method to fabricate the holograms.