Study On The Magnify Characteristic Of LD Pumped Dual-frequency Laser

Nd ion laser is a typical representative of the family of solid-state lasers. Trivalent Nd ion incorporated in a variety of crystal or glass substrate becomes in this type of laser active medium. Because the laser wavelength Nd laser produces between 1.05-1.08?m, which is suitable for producing laser propagation in the atmosphere, it is widely used in laser communications, millimeter wave radar, medical and other laser applications.LD pumped dual microchip laser with a compact, stable performance, good spectral coherence, the output frequency difference is large and tunable frequency difference and a series of advantages. Currently reported output power is generally small, generally in the milliwatt level, which can not be qualified as high-power millimeter-wave frequency laser communications applications. In order to obtain higher power and large frequency difference laser, the paper enlarged the optic power of small signal by an optical amplifier, and analyze the impact of dual-frequency laser power amplification and spectral characteristics, and specifically includes:1. Development of domestic and microchip solid-state lasers are classified introduced by Nd: YVO4, Nd:YAG lasers and other micro-chip crystal doped ions, summarize the characteristics of different doping ion laser, so as to choose crystal topics applicable reference.2. Analysis the different physical parameters of the micro-chip crystal needed to further define the subject of micro-chip crystal materials; analysis microchip solid four-level laser rate equations for lasers designed to provide theoretical guidance and analysis of noise amplification process, make guidance to improve the quality of output light beam analysis.3. Increase the pump current of LD, we can obtain higher output power with dual-frequency laser, analysis of the pumping current size of double-frequency laser output power and the influence of frequency offset, analysis of the spectrum.The small signal double-frequency laser optical input power amplifier, comparison and analysis the same pumping current situation, dual frequency small signal and after optical amplifier amplification of the two optical power spectrum characteristics and differences.4. Analysis of the thermal effect when microchip lasers works, and its heat-induced cavity length and thermally induced changes in photorefractive effect theoretical derivation, which provide theoretical guidance to reduce the thermal effects. Analysis the temperature effect of microchip laser experiment, and raised sevral kinds of methods to reduce the temperature effect.Experiment received the highest optical power of 2.36 W, the frequency difference of 47.7 GHz dual-frequency laser output. Along with the increase of LD pump current, double-frequency laser output power increases gradually, the frequency difference is slightly decreasing, and a "mode-hop" significant is been observed, center wavelength of 0.1nm drift. Optical power amplification process provides nearly 10 times the power of the addition, and improve the beam quality, but at the same time decrease the frequency spectum, which is caused by unbalanced gain curve of optical amplifier.