Research On Spatial Combining Of Single Tube Blue Semiconductor Laser Based On TO Package

450nm blue semiconductor lasers are widely used in laser display,laser printing and laser processing.At present,the power of a single blue tube is low,and it is of great significance to use spatial beam combining to obtain a high-power blue laser semiconductor laser.This paper is based on the blue light single tube NUBM08 with collimating lens of Nichia of Japan and the blue light single tube PLPT9 450LB＿E of Osram without collimating lens of Germany as the light source for spatial beam combining research.The main work is as follows.(1)The characteristics of a single tube of 450 nm Nichia blue light tube in TO9 package were studied.The PIV characteristics were analyzed and the beam divergence characteristics were simulated in ZEMAX.In the simulation,the relevant parameters of the collimator lens of the single tube were fitted,and the single tube can output 5W power under the current input of 3.5A.(2)Space combination of NUBM08 single tube was researched.A 6×8 spatial beam combining structure was adopted,and a cylindrical mirror was used to collimate the single tube twice.The simulation beam was coupled into the 400μm NA 0.22 fiber and the efficiency can reach 99%.SOLIDWORKS was used to design the fixed base and water-cooled heat dissipation structure for the scheme,and a total of 24 single-tube space combining experiments in a 3×8 structure were completed,and a stable output of 88 W power was obtained by coupling into 400μm NA 0.22 fiber,and the total efficiency was 74%.Finally,The factors affecting the efficiency of beam combining were analyzed.(3)The LIMO integrated collimator was studied to collimate a 447 nm 5W Osram blue light single tube for spatial beam combining.Based on the integrated collimator lens collimating the single tube,a 3×10 spatial beam combining structure was designed,and the cylindrical lens was used to focus the fast and slow axes of the beam.The simulation shows that the beam was coupled into the 200μm NA 0.22 fiber with an efficiency of 94%.Before the experiment,the deviation analysis of the integrated collimator was carried out.In the experiment,a precision six-axis adjustment frame was used to adjust the lens,and the lens was fixed with UV glue.The coupling efficiency was obtained as 76%,and the factors affecting the efficiency of beam combination were analyzed.(4)Research on the spatial beam combining of the OSRAM single tube fast axis collimated by the FISBA fast axis collimator was studied.The aspheric cylindrical mirror was used to collimate the fast axis of the single tube,and the 40 mm spherical cylindrical mirror was used to collimate the slow axis of the single tube.The 2×10 spatial beam combining structure was designed,and the efficiency of the simulated beam coupling into the 100μm NA0.22 fiber was 92%.Finally,based on the collimated single-tube beam combining structure of the LIMO collimator,combined with polarization beam combining and 7×1 fiber beam combining technology,a high-power blue semiconductor laser with a 600μm fiber output power of 1.5k W was designed.