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6 May 1989 Holographic Beamsplitter For Multiple Plane Wave Formation With Matched Phasefronts
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The design and fabrication of a holographic beamsplitter that will produce multiple phase and amplitude matched output beams from a collimated laser beam is discussed. Multiple exposures are recorded in a dichromated gelatin (DCG) plate to make the output beams seem to emanate from a single point with high diffraction efficiency and low scattering. During fabrication, a technique was developed to verify that the relative phasefronts of all the output beams are matched. The holograting can be designed such that any relative phase, amplitude and angle between the output beams as well as different recording/readout wavelengths can be specified for a variety of applications. A deterministic method of calculating the optimum Bragg angles for the recording beams has been developed to compensate for the wavelength shift between the recording laser and the readout laser. A special emphasis is given to the application of using a laser diode for readout. Specifically, a double grating method is utilized for making the element less sensitive to wavelength drift common to laser diodes. A single small component has been fabricated with output beams in-line with respect to the input beam axis such that it can be configured into compact and rugged optical systems.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Richard C. Kim and Steven K. Case "Holographic Beamsplitter For Multiple Plane Wave Formation With Matched Phasefronts", Proc. SPIE 1052, Holographic Optics: Optically and Computer Generated, (6 May 1989);

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