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Holography & Imaging
Laser holography is a technology that utilizes the coherence of lasers to capture and reconstruct the complete optical wave information of objects through interference recording and diffraction reconstruction. It’s not only a magic for creating amazing three-dimensional illusions but also a powerful tool for scientific measurement and research, which has profoundly influenced the development of multiple technological fields.
Laser Holographic Imaging
1. The Principle of Laser Holography
Laser holography is a technique that uses lasers to record and reconstruct the three-dimensional optical information of objects, with its core principle based on the interference recording and diffraction reconstruction of light.
Interference Record:
The laser is split into two beams by a beam splitter:
Object Beam: Light reflected from an object, carrying surface information about the object (amplitude and phase).
Reference Beam: Directly illuminates the recording medium (such as a holographic plate).
Two beams of light interfere on a photographic plate, creating intricate interference patterns (the hologram) that capture the object's complete light-field information.
Diffraction Reproduction:
When a reference light beam illuminates the hologram, the light reconstructs the original object's wavefront through diffraction, allowing the human eye to perceive a three-dimensional virtual (or real) image that perfectly matches the original object.
2. Types of Laser Holography
2.1 Transmission Holography
During both recording and reconstruction, the laser illuminates the hologram from its backside (relative to the observer). During reconstruction, the observer views the virtual image behind the hologram through it. This is the most basic type of holography and must be viewed under laser light.
2.2 Reflection Holography
During recording, the object beam and reference beam are incident on opposite sides of the holographic plate. For reconstruction, we illuminate the hologram with white light from the observer's side. The fringes inside the hologram act like a filter, reflecting only light of a specific wavelength to reconstruct the image. Thus, we can observe a monochromatic three-dimensional image under white light, which is widely used in anti-counterfeiting.
2.3 Image Plane Holography
When recording, a lens is used to form the real image of the object exactly on the plane of the holographic plate. As a result, the reconstructed image also lies on the surface of the plate, which reduces the requirement for the coherence of the light source—white light can even be used for reconstruction—though the sense of three-dimensionality is slightly weaker.
3. Typical Applications of Laser Holography
3.1 Holographic Interferometry
This is one of the most important and precise applications of laser holography in industry and scientific research.
Simultaneous Measurement of Cloud Microphysical Parameters
3.2 Ultra-High Security Anti-Counterfeiting
Laser holographic labels are extremely difficult to replicate and are widely used on banknotes, passports, credit cards, luxury brand products, and pharmaceutical packaging.
Laser Holographic Anti-Counterfeiting
3.3 Holographic Optical Elements
By using holograms instead of traditional optical components such as lenses, gratings, and beam splitters, these devices become lighter and thinner while enabling complex optical functions—making them ideal for applications like head-up displays and virtual reality equipment.
Holographic Optical Element
3.4 Holographic Data Storage
Using volume holography, a large number of data pages can be overlapped and stored at the same location in crystals or photopolymer materials by adjusting the laser angle and wavelength, enabling massive and high-speed data storage.
Laser Holographic Cloud Storage
3.5 Science and Medical Imaging
It is used for recording the three-dimensional structures of micro-particle fields, plasmas, and biological cells.
Laser Holographic Imaging of Human Viscera
4. CNI's Typical Lasers for Holography
CNI offers highly reliable, narrow-linewidth, single-longitudinal-mode (single-frequency) lasers that feature stable mode operation, long coherence length, low noise, and excellent beam quality—making them the ideal choice for laser holography and imaging applications. For more details, visit www.cnilaser.com.
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Single-Frequency Laser | Laser Interference Phenomenon |
| |||||
UV Band | Blue Light | Green Light | Yellow Light | Red Light | IR Band |
266, 320,349, 355, 360nm, etc. | 405,450,457,473, | 509,515,520,532,543, 550nm, etc. | 552,556,561,577, 589nm, etc. | 607,633,639, | 720,1030,1064,1342,1550nm, etc. |
Laser holography, as a fundamental technology, is now deeply integrating with digital holography and computational holography. By generating holograms using computers and combining them with high-speed liquid crystal spatial light modulators, we are steadily moving closer to achieving true, dynamic laser holographic 3D displays. In the future, it will continue to play an indispensable role in precision measurement, information security, and next-generation display technologies.
Changchun New Industries Optoelectronics Technology Co., Ltd.
Address: No. 888 Jinhu Road, High-Tech Zone, Changchun, 130103, P.R.China
International Tel:+86-431-85603799
Email: sales@cnilaser.com
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