Abstract
ABSTRACT Angle amplifier of laser beam scanner is a widely used device in optical systems. Volume holographic optical elements can be applied in the angle amplifier. Compared with the traditional angle amplifier, it has the advantages of high angle resolution, high diffraction efficiency, small size, and high angle magnification and flexible design. Bragg angle-wavelength-compensating recording method is introduced. Because of the Bragg compensatory relation between angle and wavelength, this device could be recorded at another wavelength. The design of the angle amplifier recording at the wavelength of 514.2nm for the working wavelength of 632.8nm is described. An optical setup for recording the angle amplifier device is designed and discussed. Experimental results in the photorefractive crystal Fe:LiNbO 3 demonstrate the feasibility of the angle amplifier scheme. Keywords: Angle amplifier, volume holographic grating, holographic optical element, beam scanner. 1. INTRODUCTION Volume Holographic Optical Elements (HOE) have been widely investigated in the last several decades for their attractive advantages including high diffraction efficiency, high resolution, light weight, low cost and ease of handling. High wavelength and angular selectivity of very thick volume hologram lead to various applications in different fields such as in spectrometers,
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