Pulse compression with a high-energy Nd:YAG regenerative amplifier system

Area of Science:

• * Laser Physics
• * Optics
• * Materials Science

Background:

• * Ultrashort laser pulses are crucial for advanced scientific research and applications.
• * Generating high-energy, near-transform-limited pulses efficiently remains a challenge.
• * Existing methods may require complex amplification setups or lack synchronizability.

Purpose of the Study:

• * To present a novel method for generating high-energy, ultrashort laser pulses.
• * To achieve readily synchronizable, near-transform-limited pulses at 1064 nm.
• * To simplify the amplification process by eliminating the need for linear amplification stages.

Main Methods:

• * Employing chirped pulse amplification (CPA) of spectrally broadened and temporally stretched pulses.
• * Utilizing a continuous-wave (cw) mode-locked Nd:YAG laser as the seed source.
• * Incorporating a commercial Nd:YAG regenerative amplifier for amplification.
• * Implementing pulse compression using a grating pair to achieve desired pulse duration.

Main Results:

• * Generation of 6-mJ pulses with durations under 20 picoseconds (ps).
• * Pulses are at a wavelength of 1064 nm and a repetition rate of 20 Hz.
• * Achieved near-transform-limited pulse characteristics.
• * Demonstrated readily synchronizable pulse output.

Conclusions:

• * The described CPA method offers an efficient route to high-energy, ultrashort laser pulses.
• * The technique simplifies the amplification chain, potentially reducing system complexity and cost.
• * The generated pulses are suitable for applications requiring precise temporal control and high peak power.