In this case, the pulse-shaped laser light emitted from the mode-locked semiconductor laser device is impacted on the first diffraction grating so as to emit first order or more diffracted light which is then impacted on the second diffraction grating so as to emit first order or more diffracted light and arrives at the partial reflection mirror.
The diffraction grating may cause first order or more diffracted light of pulse-shaped laser light emitted from the mode-locked semiconductor laser device to be incident to the dispersion compensation optical system such that 0-th order diffracted light is output to the outside of the system.
He invented instruments for his studies, including the micrometer for measuring photographs, a machine for producing improved ruled diffraction gratings, and the first telescope designed specifically for astrophotography.
Here, the wavelength selecting means may be constituted by a band-pass filter, or may be constituted by a long-pass filter or a prism, or, alternatively, may be constituted by a diffraction grating and an aperture which selects first order or more diffracted light emitted from the diffraction grating.
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