Investigation Of High Power And High Beam Quality Semiconductor Disk Laser

Semiconductor disk laser(SDL),also known as optical pumped semiconductor vertical external cavity surface-emitting lasers(OPS-VECSELs),is a kind of very attractive laser,which incorporates the advantages of solid-state laser and semiconductor lasers,including the high power,high beam quality,versatile wavelength,broad pump wavelength,high pump efficiency,compact volume,and no doping requirement for epitaxial growth.These advantages enable a wide application in laser display,laser communication,target detecting,medical treatment,and material analysis,etc.This thesis was focused on the scientific issue that the limitation mechanism of SDL’s power,beam quality and the corresponding solve solutions.High efficient thermal management of high power SDLs,the realization of near-diffraction-limited beam quality,and the beam control of intracavity frequency-doubling have been investigated.The research contents and creative achievements are as follows:(1)To realize the efficient thermal management,it proposes that using the Cu-Sn alloy to the pre-metalized diamond to solve the Pt diffusing and condensing which worsening the thermal conductivity.It has been demonstrated that the proposed method can improve the bonding quality and reduce thermal resistance.The SDL with continuous wave(CW)power over 27 W and optical-optical efficiency of 46.5% was realized.(2)The limitation factors for the beam quality of SDL were studied systematically,and the condition for the best beam quality was analyzed.It was demonstrated that when the pump spot size was 10% to 20% smaller than that of the fundamental mode,it enabled to realize the near-diffraction-limited beam quality.The SDL with the power of 12.9 W and M2<1.2 was achieved.(3)It was demonstrated a CW 1.3 W green(515nm)SDL by using the V-shaped intracavity frequency-doubling of BBO.To solve the beam quality deteriorating in frequency-doubling,it was proposed that inserting the diaphragm with a small aperture to control the beam profile and fundamental mode,improve the beam quality and spot shape,realize the high beam quality,high brightness and near-circular beam shape.