High-speed and high-flux particle speed measuring system based on optical time stretching
A time-stretching, high-throughput technology, used in radio wave measurement systems, measurement devices, and re-radiation of electromagnetic waves to achieve the effect of increasing the detection throughput and the upper limit value
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Embodiment 1
[0036] The center wavelength of the optical pulse output by the light source 1 used in this embodiment is 1560 nm, the bandwidth is 15 nm, and the pulse repetition frequency is 25 MHz.
[0037] Such as figure 2 As shown, the time stretching module 2 includes a single-mode dispersion compensating optical fiber 11 with a dispersion of 1200 ps / nm, which is installed at the light output measurement of the light source 1, and is used to map the spectral information of the optical pulse to its time-domain waveform one by one to complete the optical fiber. Time-wavelength mapping of pulses. The space mapping module 3 adopted in this embodiment includes a transmissive space mapping module, which is output to the space by the fiber collimator 12, and enters the first lined diffraction grating 13 with a line density of 1200 lines / mm at an incident angle of 80°. According to the raster formula
[0038]
[0039] where θ 1 is the incident angle of the light pulse, θ 2 is the exit a...
Embodiment 2
[0045] The difference between this embodiment and Embodiment 1 is that the space mapping module 3 used in this embodiment includes a reflective space mapping module.
[0046] Such as Figure 5 As shown, the time stretching module 2 includes a single-mode dispersion compensating optical fiber 11 with a dispersion of 1200 ps / nm, which is installed at the light output measurement of the light source 1, and is used to map the spectral information of the optical pulse to its time-domain waveform one by one to complete the optical fiber. Time-wavelength mapping of pulses. The space mapping module 3 adopted in this embodiment includes a reflective space mapping module, and the optical pulse from the single-mode dispersion compensating fiber 11 is transmitted to the fiber collimator 12 by the fiber circulator 20, and then output to the space by the fiber collimator 12, Incident angle of 80° is incident on the first reticle diffraction grating 13 with a reticle density of 1200lines / mm...
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