Coherent transient optical pulse-shape storage/recall using frequency-swept excitation pulses

Area of Science:

• Atomic Physics
• Quantum Optics
• Laser Spectroscopy

Background:

• Coherent transient signals are crucial for probing ultrafast dynamics.
• Previous methods utilized short, fixed-frequency pulses for excitation.
• Generating and controlling these pulses presents technical challenges.

Purpose of the Study:

• To demonstrate frequency-chirped laser pulses for generating coherent transient signals.
• To compare chirped pulse methods with traditional fixed-frequency pulse techniques.
• To explore the advantages of chirped pulses in spectroscopic applications.

Main Methods:

• Utilized frequency-chirped laser excitation pulses.
• Performed experiments on the 555.6-nm transition of vapor-phase atomic ytterbium.
• Stored pulse-shape information in coherences between excited-state Zeeman levels.

Main Results:

• Successfully generated coherent transient signals with temporal profiles matching the excitation pulse.
• Demonstrated that chirped pulses can be temporally longer and of lower intensity.
• Showcased easier generation of chirped pulses compared to fixed-frequency pulses.

Conclusions:

• Frequency-chirped laser excitation is an effective method for generating tailored coherent transient signals.
• Chirped pulses offer practical advantages in terms of pulse duration, intensity, and ease of generation.
• This technique advances coherent transient spectroscopy by enabling more accessible and versatile pulse shaping.