Dual-wavelength single-longitudinal-mode sub-ns lasers with high pulse repetition frequency

Abstract

A theoretical model suitable to the dual-wavelength electro-optical Q-switched laser was established. Based on the optimizations on the time-varying Q-switched loss, doped concentration of the gain medium, and transmission of the output coupler, 1 kHz 1064 nm and 532 nm single-longitudinal-mode pulse lasers both with sub-nanosecond pulse width (PW) were obtained. The measured PWs of the dual-wavelength lasers agreed well with the theoretical predictions. At a pump energy of 3.7 mJ, the PWs of the 1064 nm and 532 nm lasers were 0.97 ns and 0.61 ns, the single pulse energy of the two lasers were 0.55 mJ and 0.29 mJ. The beam quality factor, the energy fluctuation and the time jitter of the 1064 nm laser were 1.58, 0.000063% and 2.18 ps; and that of the 532 nm laser were 1.35, 0.000011% and 1.56 ps.

High repetition frequency dual-wavelength pulse Pr3+:YLF laser

“…They have wide applications in fields such as medical analysis, laser displays, precision laser spectroscopy, precision laser processing, and nonlinear optical mixers 1 – 5 In laser displays, the addition of orange light to the three-color white light based on red, green, and blue light increases the color gamut area and provides better visual effects 6 . In medicine, orange-red light is also essential, human hemoglobin has the highest absorption of light near the orange light band.…”