Multi-delay, phase coherent pulse pair generation for precision Ramsey-frequency comb spectroscopy

Area of Science:

• Quantum optics
• Laser physics
• Spectroscopy

Background:

• Frequency combs are crucial for high-precision measurements.
• Parametric amplification is a key technique for generating laser pulses.
• Phase stability is essential for advanced spectroscopic methods.

Purpose of the Study:

• To demonstrate the generation of phase-stable mJ-pulse pairs with programmable delays.
• To investigate phase shifts during parametric amplification of Ti:Sapphire frequency comb pulses.
• To explore the potential for kHz-level Ramsey-frequency comb spectroscopy.

Main Methods:

• Utilizing a Ti:Sapphire frequency comb.
• Employing parametric amplification for pulse generation.
• Conducting numerical and experimental investigations of phase shifts.

Main Results:

• Generation of phase-stable mJ-pulse pairs at delays up to hundreds of nanoseconds.
• No observed dependence of differential phase shift on inter-pulse delay (within 10 mrad error) up to 300 ns.
• Demonstrated potential for short wavelength (<100 nm) spectroscopy.

Conclusions:

• The developed system achieves high phase stability for amplified pulse pairs.
• The findings support the feasibility of kHz-level Ramsey-frequency comb spectroscopy.
• This technology opens avenues for advanced spectroscopic investigations.