Microlaser-pumped periodically poled lithium niobate optical parametric generator-optical parametric amplifier

Area of Science:

• Optics and Photonics
• Laser Technology
• Nonlinear Optics

Background:

• Narrow-bandwidth tunable light sources are crucial for high-resolution spectroscopy.
• Traditional systems often lack compactness and high repetition rates.
• Periodically poled lithium niobate (PPLN) offers high nonlinear gain for optical parametric devices.

Purpose of the Study:

• To develop a compact, high-repetition-rate tunable light source for spectroscopic applications.
• To investigate the use of a single-longitudinal-mode microlaser for pumping an optical parametric generator-optical parametric amplifier (OPG-OPA).
• To achieve narrow spectral bandwidths suitable for gas sensing.

Main Methods:

• Utilized a single-longitudinal-mode passively Q-switched Nd:YAG microlaser as the pump source.
• Employed a narrow-bandwidth periodically poled lithium niobate (PPLN) OPG-OPA system.
• Integrated an air-spaced etalon for spectral filtering of the OPG output before OPA amplification.

Main Results:

• Achieved spectroscopically useful radiation with a bandwidth of approximately 0.05 cm(-1) FWHM.
• Demonstrated tunability in 15-cm(-1) segments across signal (6820-6220 cm(-1)) and idler (2580-3180 cm(-1)) ranges.
• Showcased the feasibility of pumping an OPG-OPA with compact, high-repetition-rate microlasers due to PPLN's high gain.

Conclusions:

• The developed tunable light source, pumped by a microlaser and utilizing PPLN OPG-OPA, is well-suited for portable spectroscopic gas sensors.
• This approach enables the creation of compact and efficient tunable laser systems.
• The high gain of PPLN is key to integrating microlasers into OPG-OPA systems.