High bandwidth laser frequency locking for wideband noise suppression.

Area of Science:

• Atomic, Molecular, and Optical Physics
• Quantum Optics and Information

Background:

• Narrow-linewidth lasers are crucial for many experiments, often requiring active frequency noise suppression.
• Current frequency noise servo loops (FNSLs) have loop bandwidths (LBW) below megahertz, limiting their effectiveness in demanding applications.
• Wideband quantum sensing experiments require higher laser frequency noise suppression than currently achievable.

Purpose of the Study:

• To experimentally implement a frequency noise servo loop (FNSL) with significantly enhanced loop bandwidth.
• To demonstrate substantial laser frequency noise suppression over a wide Fourier frequency range.
• To provide a technological advancement for fields requiring wideband laser frequency stabilization.

Main Methods:

• Development and experimental implementation of a novel frequency noise servo loop (FNSL).
• Achieved a loop-delay-limited loop bandwidth (LBW) of 3.5 MHz.
• Utilized the FNSL to suppress laser frequency noise.

Main Results:

• Successfully implemented an FNSL with a 3.5 MHz loop bandwidth, an order of magnitude higher than conventional systems.
• Achieved 70 dB of laser frequency noise suppression.
• Demonstrated effective noise suppression over a 100 kHz Fourier frequency range.

Conclusions:

• The developed FNSL technology offers a significant advancement in laser frequency stabilization.
• This high-bandwidth FNSL is suitable for demanding applications, including wideband quantum sensing.
• The technology has broad applicability in scientific fields requiring robust laser frequency noise suppression.