Cubic-phase-free dispersion compensation in solid-state ultrashort-pulse lasers.

Area of Science:

• Optics and Photonics
• Laser Physics
• Materials Science

Background:

• Ultrashort pulse generation requires precise control over optical dispersion.
• Existing methods for dispersion compensation often struggle to address higher-order effects like cubic phase.
• Simultaneous compensation of group-velocity dispersion and cubic phase is crucial for maintaining pulse integrity.

Purpose of the Study:

• To demonstrate intracavity group-velocity dispersion compensation using conventional prisms.
• To achieve simultaneous elimination of round-trip cavity cubic phase.
• To determine the wavelength ranges for perfect second- and third-order dispersion compensation.

Main Methods:

• Utilizing prisms made of conventional optical materials within the laser cavity.
• Employing Brewster prisms for dispersion compensation.
• Analyzing the dependence of compensation on prism and laser rod materials, and prism angles.

Main Results:

• Successful intracavity group-velocity dispersion compensation was demonstrated.
• Simultaneous elimination of the round-trip cavity cubic phase was achieved.
• Perfect second- and third-order dispersion compensation was found to be possible within specific wavelength ranges for Ti:sapphire and Cr:LiSrAlF(6) lasers.

Conclusions:

• Conventional prisms can effectively compensate for both group-velocity dispersion and cubic phase in laser cavities.
• The proposed method offers a practical solution for ultrashort pulse generation with improved pulse quality.
• This technique is applicable over significant tuning ranges for common laser systems.