Shigeo Kayashima

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.

Optimized design method for holographic optical elements

A method is developed for analytically determining the holographic optical element phase transfer function. The method is based on the minimization of the weighted mean-squared wave-front aberration. It is shown that the wave-front aberration can be described as the linear function for unknown aspheric wave phase correction coefficients. Thus this method does not require many convergence calculations, and the optimal aspheric phase transfer function is obtained analytically. This method is applied to a holographic straight-line scanner design, and the optimal solution is obtained.