Low thermal impedance DBR for optoelectronic devices
DCFirst Claim
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1. An optoelectronic device, comprising:
- an active region adjacent a first distributed bragg reflector (DBR) comprising a plurality of mirror periods wherein each of said mirror periods comprise a first layer formed from a first material having a first thermal conductivity and a second layer formed from a second material having a second thermal conductivity that is greater than said first thermal conductivity and, wherein the optical thickness of said first layer does not equal the optical thickness of said second layer for at least a portion of the plurality of mirror periods.
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Abstract
A low thermal impedance optoelectronic device includes an optical cavity adjacent a low thermal impedance DBR that provides improved heat dissipation and temperature performance. The thermal impedance of the DBR may be reduced by increasing the relative or absolute thickness of a layer of high thermal conductivity material relative to a layer of low thermal conductivity material for at least a portion of the mirror periods. The thermal impedance may also be reduced by increasing the distance between phonon scattering surfaces by increasing the thickness of the high thermal conductivity layer, the low thermal conductivity layer or both.
52 Citations
28 Claims
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1. An optoelectronic device, comprising:
an active region adjacent a first distributed bragg reflector (DBR) comprising a plurality of mirror periods wherein each of said mirror periods comprise a first layer formed from a first material having a first thermal conductivity and a second layer formed from a second material having a second thermal conductivity that is greater than said first thermal conductivity and, wherein the optical thickness of said first layer does not equal the optical thickness of said second layer for at least a portion of the plurality of mirror periods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An optoelectronic device, comprising;
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an active region formed adjacent a distributed bragg reflector (DBR), said DBR comprising a plurality of mirror periods wherein each of said mirror periods comprise a first layer, formed from a first material GaAs having a first thermal conductivity and a second layer, formed from a second material AlAs having a second thermal conductivity that is greater than said first thermal conductivity, wherein the optical thickness of at least a portion of said mirror periods is greater than one-half wavelength of light emitted by said optoelectronic device, and further wherein the optical thickness of said first layers is greater than the optical thickness of said second layers for at least said portion of said mirror periods having an optical thickness greater than one-half the wavelength of light emitted by said optoelectronic device.
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17. An optoelectronic device comprising:
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an active region; and
a distributed bragg reflector (DBR) adjacent said active region, said DBR comprising a plurality of mirror periods wherein each of said mirror periods comprise a first layer formed from a first material having a first thermal conductivity and a second layer formed from a second material having a second thermal conductivity, said second thermal conductivity being greater than said first thermal conductivity, said plurality of mirror periods including a first mirror period adjacent said active region, said second layer of said first mirror period being adjacent said active region, said second layer of said first mirror period having an optical thickness greater than an optical thickness of said first layer of said first mirror period, said each of said plurality of mirror periods having an optical thickness equal to a multiple of ½
wavelength of light emitted by said optoelectronic device.- View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification