Electro-optic fs pulsed laser deflection in KTN crystals using UV illumination

Area of Science:

• Materials Science
• Optics and Photonics
• Laser Technology

Background:

• Femtosecond pulsed lasers (fs) are susceptible to beam deformation, limiting their application performance.
• Potassium tantalate niobate (KTN) deflectors offer potential for laser beam manipulation but face challenges with beam quality.
• Domain inversion and trapped charges in KTN crystals can negatively impact deflection fidelity.

Purpose of the Study:

• To investigate the effect of UV illumination on paraelectric-phased KTN single crystals for fs pulsed laser deflection.
• To mitigate beam deformation and enhance the performance of KTN deflectors.
• To enable high-quality deflection of fs pulsed lasers using KTN technology.

Main Methods:

• Utilized UV light illumination on paraelectric-phased KTN single crystals.
• Analyzed the control of trapped charge and minimization of domain inversion through generated electron-hole pairs.
• Evaluated the deflection performance for fs pulsed lasers, including beam quality, deflection angles, speeds, and modulation switching ratios.

Main Results:

• UV illumination effectively mitigates beam deformation effects in KTN deflectors for fs pulsed lasers.
• Controlled trapped charge and minimized domain inversion were observed due to UV-generated electron-hole pairs.
• Achieved high beam quality deflection with increased deflection angles, speeds, and modulation switching ratios.

Conclusions:

• UV-illuminated KTN deflectors provide a viable solution for high-quality fs pulsed laser beam manipulation.
• The findings enable the integration of KTN deflectors into a wider range of fs pulsed laser applications.
• This advancement accelerates the development of applications requiring precise and high-performance fs laser deflection.