Tunable IR laser source with optical parametric oscillators in series.

Area of Science:

• Optics and Photonics
• Laser Physics
• Nonlinear Optics

Background:

• Developing tunable infrared (IR) laser sources is crucial for various spectroscopic and sensing applications.
• Traditional IR sources often lack tunability or require complex setups.
• Optical parametric oscillators (OPOs) offer a promising route to generate tunable coherent light.

Purpose of the Study:

• To design and demonstrate a novel tunable infrared laser source.
• To achieve efficient generation of IR radiation in the 2.6-6 µm range.
• To characterize the performance of a two-stage OPO system.

Main Methods:

• A Q-switched Nd:YAG laser operating at 1.064 µm was used as the pump source.
• Two optical parametric oscillators (OPOs) were employed in series.
• The first OPO utilized a LiNbO(3) crystal, and its signal beam pumped a second OPO containing a AgGaSe(2) crystal.

Main Results:

• The tunable IR laser source successfully covered the spectral range of 2.6-6 µm.
• A conversion efficiency of 1.75% was achieved for the signal and idler beams relative to the input pump energy.
• The system demonstrated effective generation of tunable IR output via a two-stage OPO configuration.

Conclusions:

• The developed two-stage OPO system provides an effective method for generating tunable infrared laser radiation.
• The demonstrated efficiency of 1.75% highlights the potential of this approach for practical applications.
• This tunable IR source is suitable for applications requiring specific wavelength generation in the mid-IR spectrum.