Abstract
Based on a polarized and dual-end pumping scheme and a ring resonator, a stable, high power and high beam quality continuous-wave single-frequency Nd:YVO4 green laser directly pumped at 880 nm has been fabricated. A measured maximum output power of 12 W at 532 nm was obtained with a conversion efficiency of 23.1%. The stability of the output was better than ±0.5% and no mode hopping was observed over a period of five hours. The output beam was almost diffraction limited with a measured beam quality of M2(x)=1.03 and M2(y)=1.02. The intensity noise reached the shot noise limit (SNL) for analysis frequencies above 3.5 MHz, and the phase noise was 1.3 dB above the SNL in the range of 2 to 20 MHz.
Highlights
All-solid-state continuous-wave single-frequency green lasers with high output powers have attracted great interest on account of their important applications in, for example, pumping Ti:sapphire lasers and optical parametric oscillators [1, 2], and being widely used in quantum optics and quantum communications [3, 4]
Based on a polarized and dual-end pumping scheme and a ring resonator, a stable, high power and high beam quality continuous-wave single-frequency Nd:YVO4 green laser directly pumped at 880 nm has been fabricated
A measured maximum output power of 12 W at 532nm was obtained with a conversion efficiency of 23.1%
Summary
All-solid-state continuous-wave (cw) single-frequency green lasers with high output powers have attracted great interest on account of their important applications in, for example, pumping Ti:sapphire lasers and optical parametric oscillators [1, 2], and being widely used in quantum optics and quantum communications [3, 4]. The development of cw single-frequency green lasers is currently concentrated on how to improve the beam quality and stability while increasing the output power. Heat generation would lead to thermal stress, stress birefringence and thermal-lens effects that could limit output power and efficiency, as well as decrease the beam quality and resonator stability. To deal with this problem, a direct pumping scheme has been demonstrated [5,6,7] in which the doped ions in the laser medium are directly excited into the upper lasing level. These lasers only operated in a single-transverse-mode, and to our knowledge there have been no reports about directly pumped single longitudinal-mode cw green lasers
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