1.5 µm pulse-train self-optical parametric oscillator with tunable output based on an Nd:MgO:PPLN crystal

Area of Science:

• Nonlinear Optics
• Laser Physics

Background:

• Self-optical parametric oscillators (SOPOs) are crucial for generating tunable laser light.
• Nd:MgO:PPLN crystals offer excellent nonlinear optical properties for parametric processes.

Purpose of the Study:

• To demonstrate a 1.5 μm pulse-train SOPO using an Nd:MgO:PPLN crystal.
• To develop a dynamical model for analyzing the SOPO process and its parameters.
• To investigate methods for flexible modulation of pulse characteristics and envelope shaping.

Main Methods:

• Utilized a 1.5 μm pulse-train self-optical parametric oscillator.
• Employed an Nd:MgO:PPLN crystal as the nonlinear medium.
• Developed and applied a dynamical model to analyze population inversion and photon densities.
• Experimentally varied pump parameters (frequency, duty cycle, waveform) to control output.

Main Results:

• Achieved precise regulation of subpulse number and interval by adjusting pump parameters.
• Demonstrated shaping of the pulse-train envelope by tailoring the pump waveform.
• Obtained a minimum subpulse width of 20.4 ns and maximum average output power of 1.66 W.
• Reported a slope efficiency of 5.4% with 40 W pump power.
• Showed good agreement between theoretical predictions and experimental measurements.

Conclusions:

• The study successfully demonstrates a flexible 1.5 μm pulse-train SOPO.
• The developed dynamical model provides a theoretical basis for understanding and controlling the laser output.
• This approach offers a pathway for developing compact and tunable 1.5 μm pulse-train lasers.