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How does continuous-wave laser holography differ from pulsed-laser holography?
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holography
Figure 1: Gabor's original method for creating holograms.
The primary difference between continuous-wave (CW) laser holography and pulsed-laser holography lies in their exposure requirements and suitability for capturing moving subjects.
- Continuous-Wave (CW) Laser Holography: This method utilizes a steady, bright beam of coherent light. Because the beam is less intense than a pulsed source, it requires long exposure times. Consequently, it is unsuitable for subjects that exhibit even slight motion, as any movement during the exposure will prevent the formation of a usable hologram.12
- Pulsed-Laser Holography: This technique employs an extremely rapid, high-intensity flash of light, often lasting less than 1/10,000,000 of a second. By capturing the image in such a brief interval, it effectively "freezes" fast-moving objects, provided they do not move more than 1/10 of a wavelength of light during the pulse. This makes it ideal for studying dynamic phenomena, such as chemical reactions or high-speed air flow in wind-tunnel experiments.2
Despite these operational differences, holograms produced by both methods share the same three-dimensional characteristics.2