Effective suppression of beam divergence for a high-power laser diode bar by an external-cavity technique

We describe effective suppression of beam divergence for a high-power laser diode bar by use of an external-cavity technique. Nineteen off-axis external-cavity laser diodes of the high-power laser diode are formed by feedback with a stripe mirror. At three times the threshold current, the diverging...

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Bibliographic Details
Published in:Optics letters 2004-02, Vol.29 (4), p.361-363
Main Authors: Gao, Xin, Zheng, Yujin, Kan, Hirofumi, Shinoda, Kazunori
Format: Article
Language:English
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Summary:We describe effective suppression of beam divergence for a high-power laser diode bar by use of an external-cavity technique. Nineteen off-axis external-cavity laser diodes of the high-power laser diode are formed by feedback with a stripe mirror. At three times the threshold current, the diverging angle (1/e2) of the external-cavity laser diode bar is reduced to 1.5 degrees from 6.6 degrees (free running) with 14.1-W peak output power and 70.4% of the radiated power of the free-running state without the external cavity. This technique effectively improves the beam quality of the high-power laser diode bar.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.29.000361