Ultrafast optical imaging technology: principles and applications of emerging methods

TLDR

High‑speed optical imaging enables blur‑free observation of rapid transient dynamics across science, industry, defense, energy, and medicine, but conventional electronic cameras are limited by shutter speed and frame rate, prompting recent unconventional approaches that surpass these constraints. This review surveys ultrafast optical imaging concepts, compares their advantages and disadvantages, and explores novel applications enabled by these methods. The authors analyze the technical principles and operational mechanisms of several ultrafast imaging techniques, evaluating their design features and performance trade‑offs.

Abstract

Abstract High-speed optical imaging is an indispensable technology for blur-free observation of fast transient dynamics in virtually all areas including science, industry, defense, energy, and medicine. High temporal resolution is particularly important for microscopy as even a slow event appears to occur “fast” in a small field of view. Unfortunately, the shutter speed and frame rate of conventional cameras based on electronic image sensors are significantly constrained by their electrical operation and limited storage. Over the recent years, several unique and unconventional approaches to high-speed optical imaging have been reported to circumvent these technical challenges and achieve a frame rate and shutter speed far beyond what can be reached with the conventional image sensors. In this article, we review the concepts and principles of such ultrafast optical imaging methods, compare their advantages and disadvantages, and discuss an entirely new class of applications that are possible using them.