Generation of tunable subpicosecond pulses using low-Q dye cavities

Area of Science:

• Laser Physics
• Nonlinear Optics
• Spectroscopy

Background:

• Generating tunable, high-power, subpicosecond laser pulses is crucial for various scientific applications.
• Traditional methods often face limitations in pulse energy, tunability, or pulse duration.

Purpose of the Study:

• To design and characterize a low-Q cavity dye laser chain for efficient subpicosecond pulse generation.
• To achieve high-power tunable output from 450 to 700 nm.

Main Methods:

• Utilized a cascade of two low-Q short dye cavities pumped above threshold.
• Employed extracavity pulse shaping with a saturated absorber and amplifiers.
• Generated tunable subpicosecond pulses via supercontinuum generation, spectral selection, and dye amplification.

Main Results:

• Achieved stable generation of single 500-fs pulses, a pulse-shortening factor exceeding 10^4.
• Produced output pulse energies of 500 microJ (1-GW peak power) from 40-mJ pump energy.
• Demonstrated tunable output from 450 to 700 nm.

Conclusions:

• The presented low-Q cavity dye laser chain effectively generates high-power tunable subpicosecond pulses.
• The cascaded cavity design and extracavity pulse shaping are key to achieving significant pulse shortening and high output energy.
• The results provide a robust method for producing ultrashort pulses for advanced spectroscopic and nonlinear optical studies.