How to make a Hologram

Introduction

In this tutorial, we'll guide you through the detailed process of creating a real hologram using dichromated gelatin (DCG) holography. This step-by-step guide is based on a comprehensive YouTube video by Holocreators GmbH, which covers everything from preparing the glass to sealing the finished hologram. Whether you're a hobbyist or a professional, this guide will provide you with the knowledge you need to successfully create your own hologram.

Step 1: Check the Glass

• Examine the glass for a “parallel-lines-pattern” to determine its orientation.
• Ensure the pattern is consistent and properly aligned to achieve the best hologram results.

Step 2: Cut the Glass

• Use a proper glass cutting technique to minimize waste.
• Measure and mark the desired dimensions before cutting.
• Employ a glass cutter to score the glass, then carefully break along the scored line.

Step 3: Clean the Glass

• Select appropriate cleaning chemicals, such as isopropyl alcohol or glass cleaner.
• Identify the correct side for coating by checking for any imperfections or residues.
• Wipe the glass thoroughly to remove dust and grease.

Step 4: Prepare the Gelatin

• Create the DCG solution using a recommended recipe.
• Adjust the formulation based on temperature and the wavelength of the laser being used.
• Heat the gelatin gently to dissolve it completely.

Step 5: Sensitize the Gelatin

• Add Ammonium Dichromate to the gelatin mix to enhance photosensitivity.
• Filter the mixture to remove any undissolved particles, ensuring a smooth coating.

Step 6: Coat the Glass

• Work in a controlled environment to minimize dust and contamination.
• Use a coating rod or similar tool to evenly apply the sensitized gelatin onto the glass surface.
• Allow the coated glass to dry properly to ensure a uniform layer.

Step 7: Build the Exposure Setup

• Construct a stable holographic recording setup using a laser, beam splitter, and mirrors.
• Ensure that the setup allows for precise positioning and stability during exposure.

Step 8: Exposure

• Carefully position your coated glass in the exposure setup.
• Expose the glass to laser light for the recommended duration to capture the holographic image.
• Monitor the exposure closely to avoid overexposure or underexposure.

Step 9: Develop the Hologram

• Rinse the exposed glass in a developer solution to reveal the holographic image.
• Control variables such as temperature and time during the development process for optimal results.

Step 10: Scrape the Hologram

• Gently scrape away some of the gelatin from the edges of the hologram.
• This will help frame the hologram and enhance its overall appearance.

Step 11: Seal the Hologram

• Use epoxy resin to seal the hologram and protect it from moisture.
• Apply a cover plate to ensure the hologram remains intact and preserved over time.

Step 12: Grind the Edges

• Grind the sharp edges of the glass using a glass grinder or sandpaper.
• This will make the hologram safer to handle and improve its presentation.

Conclusion

Creating a hologram using DCG is a meticulous but rewarding process. By following these twelve steps, you can produce stunning holographic images that will impress and inspire. After completing your hologram, consider experimenting with different designs and techniques to further enhance your skills. Happy holography!