Optical device structure using GaN substrates for laser applications
First Claim
Patent Images
1. An optical device comprising:
- a gallium and nitrogen containing substrate member having an m-plane nonpolar crystalline surface region characterized by an off-cut orientation of about −
2 degrees to about 2 degrees toward (000-1) and less than about 0.5 degrees toward (11-20), the off-cut orientation not inclusive of zero degrees toward (000-1);
a laser stripe region formed overlying a portion of the m-plane nonpolar crystalline surface region, the laser stripe region being characterized by a cavity orientation substantially parallel to a c-direction, the laser stripe region having a first end and a second end;
a first cleaved c-face facet provided on the first end of the laser stripe region, the first cleaved c-face facet comprising a first mirror surface, the first cleaved c-face facet having first laser scribed regions extending intermittently along a first upper edge of the first cleaved c-face facet to provide a first saw tooth profile, wherein each of the first laser scribed regions forms a tooth of the first saw tooth profile, each of the first laser scribed regions is spaced from adjacent ones of the first laser scribed regions by smooth surfaces of the first cleaved c-face facet, and a depth that the first laser scribed regions extend downward from the first upper edge toward the m-plane nonpolar crystalline surface region varies across the first cleaved c-face facet; and
a second cleaved c-face facet provided on the second end of the laser stripe region, the second cleaved c-face facet comprising a second mirror surface, the second cleaved c-face facet having second laser scribed regions extending intermittently along a second upper edge of the second cleaved c-face facet to provide a second saw tooth profile, wherein each of the second laser scribed regions forms a tooth of the second saw tooth profile, each of the second laser scribed regions is spaced from adjacent ones of the second laser scribed regions by smooth surfaces of the second cleaved c-face facet, and a depth that the second laser scribed regions extend downward from the second upper edge toward the m-plane nonpolar crystalline surface region varies across the second cleaved c-face facet.
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Abstract
An optical device includes a gallium nitride substrate member having an m-plane nonpolar crystalline surface region characterized by an orientation of about −2 degrees to about 2 degrees towards (000-1) and less than about 0.5 degrees towards (11-20). The device also has a laser stripe region formed overlying a portion of the m-plane nonpolar crystalline orientation surface region. A first cleaved c-face facet is provided on one end of the laser stripe region, and a second cleaved c-face facet is provided on the other end of the laser stripe region.
302 Citations
42 Claims
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1. An optical device comprising:
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a gallium and nitrogen containing substrate member having an m-plane nonpolar crystalline surface region characterized by an off-cut orientation of about −
2 degrees to about 2 degrees toward (000-1) and less than about 0.5 degrees toward (11-20), the off-cut orientation not inclusive of zero degrees toward (000-1);a laser stripe region formed overlying a portion of the m-plane nonpolar crystalline surface region, the laser stripe region being characterized by a cavity orientation substantially parallel to a c-direction, the laser stripe region having a first end and a second end; a first cleaved c-face facet provided on the first end of the laser stripe region, the first cleaved c-face facet comprising a first mirror surface, the first cleaved c-face facet having first laser scribed regions extending intermittently along a first upper edge of the first cleaved c-face facet to provide a first saw tooth profile, wherein each of the first laser scribed regions forms a tooth of the first saw tooth profile, each of the first laser scribed regions is spaced from adjacent ones of the first laser scribed regions by smooth surfaces of the first cleaved c-face facet, and a depth that the first laser scribed regions extend downward from the first upper edge toward the m-plane nonpolar crystalline surface region varies across the first cleaved c-face facet; and a second cleaved c-face facet provided on the second end of the laser stripe region, the second cleaved c-face facet comprising a second mirror surface, the second cleaved c-face facet having second laser scribed regions extending intermittently along a second upper edge of the second cleaved c-face facet to provide a second saw tooth profile, wherein each of the second laser scribed regions forms a tooth of the second saw tooth profile, each of the second laser scribed regions is spaced from adjacent ones of the second laser scribed regions by smooth surfaces of the second cleaved c-face facet, and a depth that the second laser scribed regions extend downward from the second upper edge toward the m-plane nonpolar crystalline surface region varies across the second cleaved c-face facet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for forming an optical device comprising:
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providing a gallium nitride substrate member having an m-plane nonpolar crystalline surface region characterized by an orientation of about −
2 degrees to about 2 degrees towards (000-1) and less than about 0.5 degrees towards (11-20), the off-cut orientation not inclusive of zero degrees toward (000-1);forming a laser stripe region overlying a portion of the m-plane nonpolar crystalline surface region, the laser stripe region being characterized by a cavity orientation substantially parallel to a c-direction, the laser stripe region having a first end and a second end and having a top and a bottom, the bottom being closer to the m-plane nonpolar crystalline surface region than the top; and forming a pair of cleaved facets including a first cleaved c-face facet provided on the first end of the laser stripe region and a second cleaved c-face facet provided on the second end of the laser stripe region, the first cleaved c-face facet comprising a first mirror surface, the first cleaved c-face facet having first laser scribed regions extending intermittently along a first upper edge of the first cleaved c-face facet to provide a first saw tooth profile, wherein each of the first laser scribed regions forms a tooth of the first saw tooth profile, each of the first laser scribed regions is spaced from adjacent ones of the first laser scribed regions by smooth surfaces of the first cleaved c-face facet, and a depth that the first laser scribed regions extend downward from the first upper edge toward the m-plane nonpolar crystalline surface region varies across the first cleaved c-face facet, and the second cleaved c-face facet comprising a second mirror surface, the second cleaved c-face facet having second laser scribed regions extending intermittently along a second upper edge of the second cleaved c-face facet to provide a second saw tooth profile, wherein each of the second laser scribed regions forms a tooth of the second saw tooth profile, each of the second laser scribed regions is spaced from adjacent ones of the second laser scribed regions by smooth surfaces of the second cleaved c-face facet, and a depth that the second laser scribed regions extend downward from the second upper edge toward the m-plane nonpolar crystalline surface region varies across the second cleaved c-face facet. - View Dependent Claims (25, 26, 27)
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28. An optical device comprising:
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a gallium and nitrogen containing substrate member having a {20-21} crystalline surface region characterized by an off-cut orientation of −
8 degrees to −
2 degrees or 2 degrees to 8 degrees toward a c-plane;a laser stripe region formed overlying a portion of the crystalline surface region, the laser stripe region having a first end and a second end; a first cleaved facet provided on the first end of the laser stripe region, the first cleaved facet comprising a first mirror surface, the first cleaved facet having first laser scribed regions extending intermittently along a first upper edge of the first cleaved c-face facet to provide a first saw tooth profile, wherein each of the first laser scribed regions forms a tooth of the first saw tooth profile, each of the first laser scribed regions is spaced from adjacent ones of the first laser scribed regions by smooth surfaces of the first cleaved c-face facet, and a depth that the first laser scribed regions extend downward from the first upper edge toward the m-plane nonpolar crystalline surface region varies across of the first cleaved facet; and a second cleaved facet provided on the second end of the laser stripe region, the second cleaved facet comprising a second mirror surface, the second cleaved facet having second laser scribed regions extending intermittently along a second upper edge of the second cleaved c-face facet to provide a second saw tooth profile, wherein each of the second laser scribed regions forms a tooth of the second saw tooth profile, each of the second laser scribed regions is spaced from adjacent ones of the second laser scribed regions by smooth surfaces of the second cleaved c-face facet, and a depth that the second laser scribed regions extend downward from the second upper edge toward the m-plane nonpolar crystalline surface region varies across the second cleaved facet. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification