1 kHz, multi-wavelength MOPA system with narrow-pulse-width and single-longitudinal-mode output

Area of Science:

• Optics and Photonics
• Laser Technology
• Atmospheric Science

Background:

• Developing compact, multi-wavelength laser sources is crucial for advanced remote sensing.
• Nd:YAG lasers offer a versatile platform for generating fundamental and harmonic frequencies.

Purpose of the Study:

• To engineer a compact, all-solid-state laser system capable of simultaneous multi-wavelength, narrow-linewidth pulse generation.
• To demonstrate the suitability of this laser source for high-resolution remote atmospheric sensing.

Main Methods:

• Utilizing a volume Bragg grating (VBG) output coupler for single-longitudinal-mode (SLM) operation of a Nd:YAG oscillator.
• Implementing a four-stage amplification process to boost fundamental pulse energy.
• Employing nonlinear frequency conversion techniques to generate multiple harmonic wavelengths.

Main Results:

• Achieved simultaneous narrow-linewidth (2.8 pm at 1064 nm) pulses at 1064, 532, 355, and 266 nm.
• Delivered pulse energies of 10.6 mJ (1064 nm), 6.8 mJ (532 nm), 5.8 mJ (355 nm), and 2.3 mJ (266 nm).
• Maintained pulse durations below 3 ns across all wavelengths with sub-1 pm harmonic linewidths.

Conclusions:

• The developed compact, all-solid-state laser provides high-energy, multi-wavelength output with narrow linewidths.
• This laser system represents a significant advancement for high-resolution remote atmospheric sensing.
• The simultaneous generation of multiple wavelengths enhances the capabilities for detailed atmospheric profiling.