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30 Apr
Continuous real-time imaging has been performed at a frame speed of 163 ns (a frame rate of 6.1 MHz) and a shutter speed of 440 ps using a technique that maps a two-dimensional (2D) image into a serial time-domain data stream.
The key features of the STEAM camera are depicted in the next figure. A mode-locked femtosecond laser and an erbium-doped fibre amplifier (EDFA) are used to pre-amplify the image. The amplification enables fast real-time imaging of dynamic events. Then the image enters a dispersive fibre (DCF), and its spectrum is simultaneously mapped into the time domain. The amplified dispersive Fourier transformer consisted of a DCF with a total group-velocity dispersion of -3.3 ns nm-1. The optical spectrum appears as a serial sequence in time, allowing the image to be captured with a photodiode and an oscilloscope.
More information:
- “Serial time-encoded amplified imaging for real-time observation of fast dynamic phenomena”. K. Goda, K. K. Tsia & B. Jalali. Nature 458, 1145-1149, 30 April 2009.
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- Ultrafast camera. [In spanish language: La cámara ultrarrápida]
