Multi-Wavelength Narrow-Spacing Laser Frequency Stabilization Technology Based on Fabry-Perot Etalon

Area of Science:

• Optical Engineering
• Laser Physics
• Metrology

Background:

• Classical frequency-stabilized lasers offer high stability but have limited wavelength spacing.
• This limitation restricts their application in diverse scientific and technological fields.

Purpose of the Study:

• To develop a novel frequency-stabilized laser scheme with enhanced flexibility and adaptability.
• To overcome the wavelength spacing limitations of traditional laser stabilization techniques.

Main Methods:

• Integration of a Fabry-Perot etalon (FPE) with digital control and wavelength modulation.
• Derivation of an error signal from the FPE's transmission curve first-order differentiation.
• Utilizing feedback control to lock laser output to FPE transmission peaks.

Main Results:

• Successful stabilization of laser output to multiple FPE transmission peaks.
• Achieved a flexible 25 GHz wavelength spacing.
• Improved frequency stability by two orders of magnitude, reaching hundreds of kHz (10^-10 stability level).

Conclusions:

• The proposed scheme significantly enhances laser frequency stability and adaptability.
• The digital control and FPE integration offer a versatile solution for frequency-stabilized lasers.
• This advancement broadens the utility of frequency-stabilized lasers in various applications.