Assume that infrared radiation of frequency ?1 is mixed with an intense laser beam of frequency ?2 to form the up converted signal at frequency ?3 = 1+?2.
Assume that infrared radiation of frequency ?1 is mixed with an intense laser beam of frequency ?2 to form the up converted signal at frequency ?3 = 1+?2.
infrared up conversion. One means of detecting infrared radiation is to first convert the infrared radiation to the visible by the process of sum frequency generation. Assume that infrared radiation of frequency ?1 is mixed with an intense laser beam of frequency ?2 to form the up converted signal at frequency ?3 = 1+?2. Derive a formula that shows how the quantum efficiency for converting infrared photons to visible photons depends on the length L and nonlinear coefficient deff of the mixing crystal, and on the phase mismatch ?k. Estimate numerically the value of the quantum efficiency for up conversion of 10-µm infrared radiation using a 1-cm-long proustite crystal, 1 W of laser power at a wavelength of 0.65 µm, and the case of perfect phase matching and optimum focusing
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