Second harmonic generation of TEA CO2 lasers with high output power for lidar systems

Pavel P. Geiko; Yuri M. Andreev; Aleksander I. Vernik; Lilya G. Geiko

doi:10.1117/12.397815

5 September 2000 Second harmonic generation of TEA CO2 lasers with high output power for lidar systems

Pavel P. Geiko, Yuri M. Andreev, Aleksander I. Vernik, Lilya G. Geiko

Proceedings Volume 4035, Laser Radar Technology and Applications V; (2000) https://doi.org/10.1117/12.397815
Event: AeroSense 2000, 2000, Orlando, FL, United States

Abstract

The goal of this work is possibility investigation for developing of high efficient and high output power mini TEA CO₂ laser Second Harmonic Generators (SHG) applicable to use in mobile gas analysis lidars. Efficiency of SHG with Te, CdGeAs₂, ZnGeP₂, AgGaSe₂ AgIn_0.4Ga_0.6Se₂, Tl₃AsSe₃, and GaSe nonlinear crystals was estimated by solving shortened equations for interacting waves in combination with thermodynamic one. The latter equation allowed us to take into account the crystal self-heating effect (thermal refraction and lens effect) and inhomogeneous disturbance of SHG phase-matching, as well as took into account an energy transfer from the pumping wave to SH, optical losses, aperture and diffraction effects. In so doing we demonstrate SHG efficiencies using the following CO₂ pumping laser parameters: wavelength (lambda) equals 9.3 micrometer, pulse duration (tau) equals 50 ns, pulse repetition rate f equals 1000 Hz, pulse power E equals 50 mJ. The pulse repetition rate satisfies condition of the 'frozen' atmosphere and the energy is sufficiently large for working on topographic targets that are 10 km off using both CO₂ laser emission and its SH (the conversion efficiency is from 5 to tens of percent). Besides, we believed that the laser is operated in TEM₀₀ mode, the pumping intensity was assumed to be a half of the threshold pumping intensity (it provides for stable SHO operation), the time shape and intensity distribution in the beam cross section were assumed to be Gaussian. These parameters as a whole correspond to ones of the typical mini TEA CO₂ lasers, which are used in mobile lidars. Additional angular tuning of the crystals, that maximizes SHG efficiency, as well as the optimal crystal lengths, giving its absolute maximum for the fixed pumping pulse repetition rate, were also determined.

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Pavel P. Geiko, Yuri M. Andreev, Aleksander I. Vernik, and Lilya G. Geiko "Second harmonic generation of TEA CO2 lasers with high output power for lidar systems", Proc. SPIE 4035, Laser Radar Technology and Applications V, (5 September 2000); https://doi.org/10.1117/12.397815

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