Crystal Nonlinear Optics: Principles and Applications with SNLO Examples
Goal: Determine how much the "extraordinary" beam drifts away from the "ordinary" beam. SNLO Module: Biref. crystal nonlinear optics with snlo examples pdf
| Crystal | Process | PM Type | Tuning Method | SNLO Example Use Case | |---------|---------|---------|----------------|------------------------| | BBO | SHG 800→400 nm | Type I (ooe) | Angle (29°) | High-energy pulsed lasers | | LBO | SHG 1064→532 nm | Type I (ooe) | Non-critical (90°) | High average power, low walk-off | | KTP | OPO 532 nm pumped | Type II (eoe) | Angle or temperature | Nanosecond OPOs | | PPLN | DFG 1.5 μm & 1.06 μm → 3.5 μm | QPM (1st order) | Temperature | Mid-IR CW generation | Use two near-IR pumps in PPLN or OP-GaAs
The induced polarization is expanded as: [ P(t) = \varepsilon_0 \left( \chi^(1) E(t) + \chi^(2) E^2(t) + \chi^(3) E^3(t) + \dots \right) ] For second-order (( \chi^(2) )) processes—relevant to most frequency conversion crystals—the material must lack inversion symmetry. Common crystals include BBO, LBO, KTP, LiNbO₃, and periodically poled (PPLN). Lithium niobate (LiNbO3) Beta barium borate (β-BaB2O4, BBO)
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