Patent ID: 11902495
Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 8:
9. An ultrafast camera system comprising:
a wavelength division multiplexer that generates sub-pulses by wavelength-dividing an optical pulse train output from a pulsed laser;
a wavelength dispersion device to disperse the sub-pulses generated by the wavelength division multiplexer into different angles according to each wavelength of the sub-pulses;
a lens that vertically injects the sub-pulses dispersed at an angle corresponding to wavelength by the wavelength dispersion device onto a measurement target;
a timing detector that receives an optical signal obtained by multiplexing the sub-pulses reflected from points of the measurement target and outputs electrical signals corresponding to timing errors between a reference signal and sub-pulses included in the optical signal by using a plurality of balanced photodetectors; and
a reference signal source to output the reference signal synchronized with the pulsed laser,
wherein the sub-pulses reflected from the points on the measurement target are entered to the timing detector via the lens, the wavelength dispersion device, and the wavelength division multiplexer, and
wherein the reference signal source comprises
an electrical pulse generator that generates photocurrent pulses as the reference signal by performing photoelectric transformation on the optical pulse train of the pulsed laser, or
a voltage-controlled oscillator that generates a microwave signal as the reference signal, which is frequency-locked by the optical pulse train of the pulsed laser.