Compact fiber-ring resonator for blue external cavity diode laser stabilization.

Area of Science:

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

Background:

• High-frequency noise limits the performance of diode lasers in precision applications.
• External-cavity diode lasers (ECDLs) are widely used but susceptible to frequency noise.
• Narrow linewidth blue lasers are crucial for applications like quantum information processing and spectroscopy.

Purpose of the Study:

• To demonstrate a compact and cost-effective all-fiber locking setup for frequency stabilization.
• To suppress the frequency noise of a 420 nm external-cavity diode laser.
• To achieve significant linewidth narrowing for the blue diode laser.

Main Methods:

• Utilized an all-fiber-based locking scheme.
• Implemented frequency-noise suppression techniques.
• Characterized the laser linewidth and frequency noise spectrum.

Main Results:

• Achieved frequency noise reduction of up to 40 dB in the 100 Hz to 800 kHz range.
• Reduced the laser linewidth from 850 kHz to 20 kHz (for 10 ms integration time).
• Demonstrated a compact and low-cost setup.

Conclusions:

• The developed fiber-based locking setup effectively suppresses frequency noise in blue diode lasers.
• The scheme offers significant linewidth narrowing, enabling high-precision applications.
• This simple and compact system is adaptable for various wavelengths and embedded applications.