YAN Hong-yu, GAO Xin, SONG Jian etc. Evaluation of Beam Quality <em>M</em><sup>2</sup> for 976 nm Wide Stripe High Power Semiconductor Laser[J]. Chinese Journal of Luminescence, 2019,40(2): 196-203
YAN Hong-yu, GAO Xin, SONG Jian etc. Evaluation of Beam Quality <em>M</em><sup>2</sup> for 976 nm Wide Stripe High Power Semiconductor Laser[J]. Chinese Journal of Luminescence, 2019,40(2): 196-203 DOI: 10.3788/fgxb20194002.0196.
Evaluation of Beam Quality M2 for 976 nm Wide Stripe High Power Semiconductor Laser
In order to improve the beam quality of 976 nm wide stripe high power semiconductor laser
a beam quality measurement setup for high power semiconductor lasers is constructed based on the strict second moment theory. This setup is used to measure the beam waist position
beam waist size and far field divergence angle of 976 nm wide stripe high power semiconductor lasers prepared by our lab. The experimental result shows that with the increase of current from 1 A to 10 A
the fast axis beam width and far-field divergence angle increase slightly due to the anti-guidance effect
but the beam parameters change very small because of the strong refractive index guidance mechanism in the vertical direction. The beam quality is almost unchanged
when the beam quality factor
M
2
is only increased from 1.32 to 1.48. In slow axis direction
the beam width and far field divergence angle increase gradually with the increase of operating current due to the high-order mode lasing caused by the anti-guidance effect and the thermal lens effect. The beam quality becomes worse
when the beam quality factor
M
2
is increased from 5.44 to 11.76. The difference of the beam quality factor is compared with the definition of paraxial beam and non-paraxial beam. The results show that there is an obvious difference by different beam definitions in the fast axis direction and the paraxial beam definition is not suitable for the calculation. In the direction of slow axis
the results are approximately equal and can be approximately calculated by using the paraxial beam definition.
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Keywords
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