Font Size: a A A

Experimental Investigation Of All-Solid-State CW And Pulse Single-Longitudinal-Mode Laser At 1.06μm

Posted on:2015-12-21Degree:MasterType:Thesis
Country:ChinaCandidate:Y C JiaoFull Text:PDF
GTID:2308330461485054Subject:Optics
Abstract/Summary:PDF Full Text Request
The rapid development of all-solid-state lasers attribute to its high conversion efficiency, good beam quality, compact structure and long lifetime. Especially the single-frequency laser with narrow line-width, high output, stability frequency characteristics and low noise is widely used in quantum optics, cold atom physics, quantum information processing and gravitational wave measurement. And single-longitudinal-mode pulse laser with high peak power can be obtained by a Q-switch. It has greatly significant for the development of nonlinear optical frequency conversion technology. With the development of scientific research, we need a higher output of single longitudinal mode laser. However, the higher output and single longitudinal mode operating are difficult to achieve simultaneously.At this thesis, we are concentrated on improving the output and ensuring the laser operated in stable single-frequency at the same time. The thermal effect of the laser crystal seriously restrict the increasing output of the laser, in order to increase the laser output we had taken many methods to reduce the thermal effect of the laser crystal. We introduced nonlinear loss by inserting a nonlinear crystal in resonator to suppress mode hopping, which can improve the stability for a single-frequency laser. The measured maximum output of 20 W at 1.06 μm was obtained and observed that the non-linear process can suppress the intensity noise of 1.06 μm laser. We also studied the single-longitudinal mode pulse laser. A single-longitudinal-mode pulse laser is achieved in experiment. The main contents are as follows:1. Firstly, we briefly introduced the development of diode-pumped solid-state lasers, which is focused on the application of single-frequency diode-pumped solid-state at 1.06 μm and its research status. Also we introduced the application of single-longitudinal-mode pulse laser as well as its research status.2. Firstly, we introduced the characteristics of Nd:YVO4 crystal and analyzed the thermal effects and effective improvement measurements. Then we introduced the important of nonlinear loss for longitudinal mode stability and we selected the appropriate frequency doubling crystal inserting in the cavity acted as a nonlinear loss to achieve passive frequency stabilization. Basis on the theoretical analysis and the resonator design, the measured maximum output of 20 W at 1.06 μm was obtained. Also we researched the noise with considering nonlinear processing.3. We compared three Q-switches and selected acousto-optic Q-switch. Then we analyzed the optimization theory of Q-switch lasers and select the appropriate parameters base on this theory. We designed a ring cavity by 4 mirrors. When the pump power of 15 W and at 200 Hz repetition rate, a single-longitudinal-mode pulse laser was achieved with the pulse width of 26.6 ns and pulse energy of 570 μJ. we introduced the nonlinear loss to the pulse laser.
Keywords/Search Tags:Nonlinear loss, Frequency stability, All-solid-state CW single-frequency 1.06μm laser, Single-longitudinal-mode pulse laser, Acoustic-optic Q-switch
PDF Full Text Request
Related items