摘要:
A substrate with a nitride semiconductor layer is cleaved to form resonator end faces, on which a coating film is formed so as to make a nitride semiconductor laser bar. This is divided into nitride semiconductor laser elements. Prior to forming the coating film on the resonator end face, the resonator end face is exposed to a plasma atmosphere generated from the gas containing nitrogen gas. When a ratio of nitrogen to gallium in the surface of the resonator end face before the exposure is represented by “a”, an average value of ratios of nitrogen to gallium inside from the surface of the resonator end face before the exposure is represented by “b”, a ratio of nitrogen to gallium in the surface of the resonator end face after the exposure to the first plasma atmosphere is represented by “d”, and an average value of ratios of nitrogen to gallium inside from the surface of the resonator end face after the exposure is represented by “e”, the value “g” that is expressed by g=(b·d)/(a·e) is set to a value that satisfies g≧0.8.
摘要:
A driving method and a driving device are provided for an LED element in which light emitting layers different from each other in light emission wavelength peak, put on each other with a barrier layer being interposed, are sandwiched by a pair of p-type and n-type layers, and color of emitted light from which substantially depends only upon driving current value. The method comprises a driving current value calculation step of obtaining a value for designating a current value corresponding to a desired color of emitted light from the LED element; a driving current generation step of generating a driving current having the current value designated by the value obtained in the driving current value calculation step; and a driving current supply step of supplying the LED element with the driving current generated in the driving current generation step.
摘要:
There is provided a nitride semiconductor light emitting device having a light emitting portion coated with a coating film, the light emitting portion being formed of a nitride semiconductor, the coating film in contact with the light emitting portion being formed of an oxynitride. There is also provided a method of fabricating a nitride semiconductor laser device having a cavity with a facet coated with a coating film, including the steps of: providing cleavage to form the facet of the cavity; and coating the facet of the cavity with a coating film formed of an oxynitride.
摘要:
Example embodiments herein relate to a nitride semiconductor light emitting device including a coat film formed at a light emitting portion and including an aluminum nitride crystal or an aluminum oxynitride crystal, and a method of manufacturing the nitride semiconductor light emitting device. Also provided is a nitride semiconductor transistor device including a nitride semiconductor layer and a gate insulating film which is in contact with the nitride semiconductor layer and includes an aluminum nitride crystal or an aluminum oxynitride crystal.
摘要:
Disclosed are a nitride semiconductor laser element including a light emitting portion made of a nitride semiconductor, and an external-cavity semiconductor laser device using it. In the nitride semiconductor laser element, a coat film made of silicon oxynitride is formed on the light emitting portion, and the reflectance of the coat film to feedback light of laser light emitted from the light emitting portion is 0.5% or less.
摘要:
The present invention comprises a light absorption film 5 which is formed on the outermost surface of an end surface on the light emitting side of a chip used in a laser device, typically, a laser chip 1 and which absorbs part of the light emitted. By forming this light absorption film 5, the collection and accumulation of pollutants which are caused by reacting with light emitted are curbed.
摘要:
In a nitride semiconductor laser bar including a group III-V nitride semiconductor layer, on the front-side cavity end face, a separation layer of aluminum nitride is laid, and further on the separation layer, an end face coating film of aluminum oxide is laid. Likewise, on the rear-side cavity end face, a separation layer of aluminum nitride is laid, and further on the separation layer, an end face coating film of an aluminum oxide/TiO2 multilayer film is laid.
摘要翻译:在包括III-V族氮化物半导体层的氮化物半导体激光器棒中,在前侧腔端面上铺设氮化铝的分离层,并且在分离层上,氧化铝的端面涂膜为 铺了 同样地,在后侧腔端面上,放置氮化铝的分离层,并且在分离层上还放置有氧化铝/ TiO 2多层膜的端面涂膜。
摘要:
Disclosed are a nitride semiconductor laser element including a light emitting portion made of a nitride semiconductor, and an external-cavity semiconductor laser device using it. In the nitride semiconductor laser element, a coat film made of silicon oxynitride is formed on the light emitting portion, and the reflectance of the coat film to feedback light of laser light emitted from the light emitting portion is 0.5% or less.
摘要:
A driving method and a driving device are provided for an LED element in which light emitting layers different from each other in light emission wavelength peak, put on each other with a barrier layer being interposed, are sandwiched by a pair of p-type and n-type layers, and color of emitted light from which substantially depends only upon driving current value. The method comprises a driving current value calculation step of obtaining a value for designating a current value corresponding to a desired color of emitted light from the LED element; a driving current generation step of generating a driving current having the current value designated by the value obtained in the driving current value calculation step; and a driving current supply step of supplying the LED element with the driving current generated in the driving current generation step.
摘要:
A nitride semiconductor laser device has a multilayer structure formed by stacking a plurality of nitride semiconductor layers made of hexagonal nitride semiconductors, while the multilayer structure is provided with a waveguide structure for guiding a laser beam, the nitride semiconductor layers forming the multilayer structure are stacked in a direction substantially perpendicular to the c-axes of the hexagonal nitride semiconductors constituting the nitride semiconductor layers, a first cavity facet forming a side surface of the waveguide structure is a c-plane having Ga-polarity, a second cavity facet forming another side surface of the waveguide structure opposed to the first cavity facet is a c-plane having N-polarity, a crystalline nitrogen-containing film is formed on the surface of the first cavity facet, and the reflectance of the first cavity facet is smaller than the reflectance of the second cavity facet.