Phase-locked optical divide-by-3 system for visible radiation

Area of Science:

• Laser physics
• Nonlinear optics
• Frequency stabilization

Background:

• Diode-pumped Thulium lasers are crucial for various applications.
• Precise frequency control of lasers is essential for advanced scientific research.

Purpose of the Study:

• To develop an optical divide-by-3 system for phase locking a Tm:YAG laser.
• To achieve frequency stabilization of a 148 THz Tm:YAG laser to an ultrastable diode laser.

Main Methods:

• Utilized an optical divide-by-3 system.
• Employed frequency doubling in AgGaS2 and frequency differencing in LiNbO3.
• Implemented an electronic servo system for frequency control.

Main Results:

• Successfully phase locked a diode-pumped Tm:YAG laser at 148 THz (2022 nm).
• Achieved phase locking to a 445 THz (674 nm) ultrastable diode laser system.
• Demonstrated routine phase-locking periods of several minutes.

Conclusions:

• The developed optical divide-by-3 system effectively phase locks Tm:YAG lasers.
• This method provides a robust approach for stabilizing infrared laser frequencies.
• Enables precise frequency control for applications requiring stable infrared sources.