The document discusses laser conoscopy, a method for examining large optical crystals. It presents the theoretical basis for analyzing conoscopic patterns in crystals and calculates the effects of sample thickness, angular aperture, and refractive indices on the patterns. Experimental conoscopic patterns are shown for various crystals, demonstrating the method's ability to characterize crystal quality and examine crystals too large for conventional microscopy. Lasers provide advantages over traditional light sources for conoscopy, and further developments could increase the technique's capabilities.