Single-block pulse-on electro-optic Q-switch made of LiNbO ₃.

Area of Science:

• Optics and Photonics
• Materials Science
• Laser Technology

Background:

• Conventional electro-optic (EO) Q-switches often require additional components like quarter-wave plates (QWP) or analyzers.
• These components can increase laser cavity size, introduce optical losses, and affect stability.
• Lithium niobate (LN) is a well-established material for EO modulators due to its excellent properties.

Purpose of the Study:

• To design and demonstrate a novel LN EO Q-switch capable of independent pulse-on operation.
• To eliminate the need for a QWP or analyzer in the laser cavity.
• To create a more compact, lossless, and stable laser system for engineering applications.

Main Methods:

• Theoretical analysis and calculations to determine optimal LN crystal orientation (θ=1.7°, φ=±45°).
• Fabrication of a specifically cut LN crystal ((xztw)-1.2°/1.2°-cut).
• Integration and testing of the novel Q-switch in a laser cavity, evaluating performance and temperature dependence.

Main Results:

• Successful demonstration of a LN EO Q-switch operating in the pulse-on regime without a QWP or analyzer.
• The quarter-wave voltage was found to be identical to conventional LN EO Q-switches.
• Performance and temperature dependence of the novel Q-switched laser were comparable to conventional designs, validating its practicability.

Conclusions:

• A novel (xztw)-1.2°/1.2°-cut LN crystal EO Q-switch has been successfully developed and demonstrated.
• This Q-switch enables pulse-on operation without a QWP or analyzer, simplifying laser cavity design.
• The new design offers significant advantages for engineering applications requiring compact, stable, and efficient lasers.