| 摘要 |
<p>A laser source which operated under the principle of cooperative upconversion produces controllable optical pulses at wavelengths which are shorter than the wavelength of the laser energy which pumps the gain medium. The source is a solid-state laser which employs a five percent Er:LiYF crystal (Xtal) which is arranged in an astigmatically-compensated 3-mirror cavity (M1, M2, and M3). Pumping is achieved at 1.5 microns in the infrared, and the system operates in a continuous-wave, mode-lock fashion in the green spectral region at approximately 544 nm. The cooperative inversion mechanism involves energy pooling by trios of excited rare earth dopant ions in the laser medium. Q-switching is achieved with the use of intracavity amplitude modulation so as to achieve three-fold upconversion. A 3-mirror astigmatically-compensated cavity with the gain medium permits modulation of losses in a manner which cannot be achieved with known systems and achieves high stability.</p> |
