Ultra-low frequency noise external cavity diode laser systems for quantum applications.

Area of Science:

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

Background:

• Ultra-low frequency noise lasers are crucial for high-precision measurements and quantum technologies.
• Achieving stable laser operation with minimal frequency noise is a persistent challenge.

Purpose of the Study:

• To present and characterize two distinct ultra-low frequency noise laser systems at 729 nm.
• To investigate the advantages and disadvantages of different laser diode types for noise reduction.
• To assess the locking capability of these lasers to optical cavities.

Main Methods:

• Experimental and theoretical analysis of laser diode characteristics.
• Measurement of fast frequency noise and Lorentzian linewidth.
• Demonstration of cavity locking for medium-finesse cavities.

Main Results:

• Development of two ultra-low frequency noise lasers at 729 nm with fast frequency noise of 30 Hz²/Hz.
• Lorentzian linewidth of 0.1 kHz achieved.
• Successful demonstration of locking capability to medium-finesse cavities.

Conclusions:

• The study provides insights into the operational characteristics of ultra-low noise lasers.
• Different laser diode types offer unique trade-offs for noise reduction and mode behavior.
• These lasers hold promise for advancing quantum technology applications requiring high control fidelity.