Soft aperture spatial filtering: 1.5W in a single spatial mode from a highly multi-mode laser diode in an external cavity
Broad area laser diodes are attractive for the high optical power they can produce. Unfortunately, this high power normally comes at the cost of severely reduced spatial coherence since the wide area of the diode wave-guide is inherently spatially multi-mode along the slow axis. We demonstrate a met...
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| Veröffentlicht in: | IEEE journal of quantum electronics 2023-10, Vol.59 (5), p.1-1 |
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| container_title | IEEE journal of quantum electronics |
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| creator | Meller, Mallachi-Elia Parshani, Idan Bello, Leon Goldovsky, David Kahana, Amir Pe'er, Avi |
| description | Broad area laser diodes are attractive for the high optical power they can produce. Unfortunately, this high power normally comes at the cost of severely reduced spatial coherence since the wide area of the diode wave-guide is inherently spatially multi-mode along the slow axis. We demonstrate a method to significantly improve the spatial coherence of a high-power broad-area diode by placing it in an external cavity that is mode selective. We design the cavity, such that the diode aperture acts as its own spatial filter, obviating the need for an intra-cavity slit-filter, and optimally utilizing the entire gain medium. We demonstrate this soft filtering method using wide diodes of 200μm and 300μm widths and compare its power-efficiency to the standard approach of hard-filtering with a slit. We obtain high-gain operation in a pure single-mode, demonstrating up to 1.5W CW power at 1064nm with excellent beam quality ( M 2 = 1.3 at 90% power). |
| doi_str_mv | 10.1109/JQE.2023.3302904 |
| format | Article |
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Unfortunately, this high power normally comes at the cost of severely reduced spatial coherence since the wide area of the diode wave-guide is inherently spatially multi-mode along the slow axis. We demonstrate a method to significantly improve the spatial coherence of a high-power broad-area diode by placing it in an external cavity that is mode selective. We design the cavity, such that the diode aperture acts as its own spatial filter, obviating the need for an intra-cavity slit-filter, and optimally utilizing the entire gain medium. We demonstrate this soft filtering method using wide diodes of 200μm and 300μm widths and compare its power-efficiency to the standard approach of hard-filtering with a slit. 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Unfortunately, this high power normally comes at the cost of severely reduced spatial coherence since the wide area of the diode wave-guide is inherently spatially multi-mode along the slow axis. We demonstrate a method to significantly improve the spatial coherence of a high-power broad-area diode by placing it in an external cavity that is mode selective. We design the cavity, such that the diode aperture acts as its own spatial filter, obviating the need for an intra-cavity slit-filter, and optimally utilizing the entire gain medium. We demonstrate this soft filtering method using wide diodes of 200μm and 300μm widths and compare its power-efficiency to the standard approach of hard-filtering with a slit. 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| source | IEEE Electronic Library (IEL) |
| subjects | Apertures Coherence Diode lasers Diodes External cavity Filtering High gain Laser beam shaping Laser beams Laser modes Lenses Optical fiber filters Power generation Semiconductor lasers Single mode Spatial filtering Waveguides |
| title | Soft aperture spatial filtering: 1.5W in a single spatial mode from a highly multi-mode laser diode in an external cavity |
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