Phase-matched UV generation at 0.1774 μm in KB(5)O(8) ·4H(2)O

Area of Science:

• Nonlinear Optics
• Laser Physics
• Materials Science

Background:

• Nd:YAG lasers are crucial sources for various scientific applications.
• Efficient harmonic generation is key for accessing new laser wavelengths.
• Potassium borate hydrates are investigated for nonlinear optical properties.

Purpose of the Study:

• To achieve sixth-harmonic generation (SHG) of a Nd:YAG laser.
• To investigate the nonlinear optical properties of KB(5)O(8)·4H(2)O.
• To determine phase-matching conditions for type-1 mixing.

Main Methods:

• Utilized type-1 mixing of the fundamental and fifth harmonic of a Nd:YAG laser.
• Performed experiments at room temperature.
• Measured phase-matching angles in different crystallographic planes (x-y and y-z).

Main Results:

• Successfully achieved sixth-harmonic generation at 1.0642 μm.
• Determined phase-matching angles: (θ = 90°, φ = 68.5 ± 0.5°) and (θ = 80.0 ± 0.5°, φ = 90°).
• Presented improved Sellmeier equations for the KB(5)O(8)·4H(2)O crystal.

Conclusions:

• KB(5)O(8)·4H(2)O is effective for high-order harmonic generation.
• The study provides accurate optical parameters for this material.
• Results contribute to the development of advanced laser frequency conversion techniques.