Subfemtosecond timing jitter between two independent, actively synchronized, mode-locked lasers

Area of Science:

• * Ultrafast science and laser technology.

Background:

• * Achieving precise timing synchronization between independent lasers is crucial for many advanced scientific applications.
• * Mode-locked titanium-sapphire (Ti:sapphire) lasers are workhorses in ultrafast science, but synchronizing them with subfemtosecond precision presents significant challenges.

Purpose of the Study:

• * To demonstrate subfemtosecond relative timing jitter between two actively synchronized, mode-locked Ti:sapphire lasers.
• * To showcase the effectiveness of a fast-bandwidth servo system and improved laser construction for enhanced stability.
• * To evaluate the repeatability and speed of setting arbitrary time delays between laser pulses.

Main Methods:

• * Implementation of a fast-bandwidth servo system for active laser synchronization.
• * Utilization of improved laser construction techniques for enhanced passive stability.
• * Characterization of relative timing jitter using precise measurement techniques over different observation bandwidths.

Main Results:

• * Achieved subfemtosecond relative timing jitter (0.58 fs) between two independent Ti:sapphire lasers with a 160-Hz observation bandwidth.
• * Demonstrated a timing jitter of 1.75 fs within a 2-MHz observation bandwidth.
• * Showcased excellent repeatability and rapid speed in setting arbitrary time delays between laser pulses.

Conclusions:

• * The developed system successfully achieves unprecedented subfemtosecond timing jitter, significantly advancing laser synchronization capabilities.
• * The combination of a fast-bandwidth servo and improved laser stability is key to reaching such high precision.
• * The demonstrated capabilities open new avenues for experiments requiring precise control over ultrashort optical pulses.