Recording of holograms using semiconductor laser radiation and a holographic selector

An investigation was made of the coherence of the radiation emitted by a compact cw semiconductor laser with a holographic selector, operating at room temperature. The coherence length was 20 mm for an output power of 10 mW. Holograms with a diffraction efficiency of $5,5\%$ were recorded. The contrast in the reconstructed image was at least $10:1$ and the data storage density was $10^4$mm${}^{-2}$.