Used in nonlinear optical applications, particularly in frequency doubling of high-power lasers. It enables conversion of infrared laser light into visible or ultraviolet wavelengths, making it valuable in laser systems for scientific research, medical devices, and precision machining. Its deuterated structure improves resistance to photorefractive damage and allows efficient operation at higher power levels compared to non-deuterated counterparts. Commonly found in Q-switched Nd:YAG lasers for generating 532 nm or 266 nm light. Also applied in electro-optic modulators and optical switches due to its stable dielectric and piezoelectric properties.