Second-harmonic generation coherence length

By measuring the temperature dependence of second-harmonic generation (SHG) of the neodymium laser wavelength at 1.06 pm in sodium nitride for five different radiation geometries which correspond to the five nonvanishing components of the nonlinear susceptibility tensor, Vogt etal. 3 2) could determine these tensor components and the coherence length 1 = 4 2 re the... 

Preliminary Property Measurements. Preliminary measurements of second harmonic generating activity on powder samples of Py-D3C, segregated by grain diameter, determined that X for the material is 1/85 20% that of quartz. These measurements also indicated a coherence length at least as long as that of quartz. 

Figure 2 Schematic diagram of the time-resolved IR spectrometer. CLS, cavity length stabilizer SHG, second harmonic generator IS, intensity stabilizer BPS, beam pointing stabilizer CS, coherent seeder PR, polarization rotator.

I i Intensity of incident light, 1 sample path length, 1 c coherent length, n, refractive index If phase matching condition A k =0 does not hold, I decreases, i.e., 1 m depends on the incident angle 0. m = 2 second harmonic generation (SHG) m=3 third harmonic generation (THG)... 

FIGURE 9 Second-harmonic power development during propagation for non-phase-matched, perfectly phase-matched, and quasi-phase-matched (QPM) second-harmonic generation. For QPM, the back-conversion into the fundamental is prevented by turning off the nonlinearity every other coherence length. 

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