Abstract:
A semiconductor laser having narrow beam spreading is provided to reduce width of an output beam of the semiconductor laser, to improve optical coupling efficiency between the semiconductor laser and an optical fiber, and to perform a photo-excitation of a bio body without a microscope or a microlens. A semiconductor laser includes a board, a lower cladding layer, a lower quantum well active layer, a core layer, an upper quantum well active layer, and an upper cladding layer. A lower cladding layer(31a) is formed on the board. A lower quantum well active layer(32a) is formed on the lower cladding layer. A core layer(33) is formed on the lower quantum well active layer. An upper quantum well active layer(32b) is formed on the core layer. An upper cladding layer(31b) is formed on the upper quantum well active layer.
Abstract:
A board spectrum light emitting device is provided to obtain lights having a broad spectrum discharged from a quantum dot and a quantum well active layer by allowing the quantum dot in an electric field reinforcing layer to absorb photons generated in the quantum well active layer to generate a second photon. Core layers(33a,33b) enclose a quantum well active layer(34). Cladding layers(31a,31b,31c,31d) include electric field reinforcing layers(32a,32b) whose refractive index is higher than that of the cladding layer. The electric field reinforcing layer includes plural quantum dots(QD). The quantum well active layer discharges light of a first wavelength. The quantum dot discharges light of a second wavelength longer than the first wavelength. A band gap of the quantum dot is smaller than that of the quantum well active layer. The quantum dot in the electric field reinforcing layer absorbs photons generated in the quantum well active layer to generate a second photon.
Abstract:
본 발명은 식 53ZrF 4 -25BaF 2 -(4-x)LaF 3 -3AlF 3 -15NaF-xTmF 3 으로 이루어진 1.48 및 1.75 마이크로미터 빛살을 방출하는 레이저 유리에 관한 것이다. 또한 본 발명의 레이저 유리에 레이저 다이오드를 펌핑광원으로서 사용하는 방출방법이 개시된다. 본 발명의 레이저 유리는 가변 파장이 크며 효율이 우수하여 소형의 레이저를 제작하는데 적합하다.
Abstract:
A method for forming a ZnO nano-crystal directly on a silicon substrate is provided to omit additional processes when forming a silicon substrate based photoelectric cell by forming the amorphous ZnO-nano crystal within a Zn-Si-O complex thin film directly. In a method for forming a ZnO nano-crystal directly on a silicon substrate, a Zn-Si-O complex thin film is formed on a semiconductor substrate, and the Zn-Si-O complex thin film is annealed. Wherein, the ZnO nano crystal is formed within an amorphous Zn-Si-O complex thin film on a silicon substrate, and the Zn-Si-O complex thin film is formed by using a sputtering method.
Abstract:
본 발명은 스트레인 보상 다층양자우물을 이용하는 단일모드형 레이저 다이오드 및 그 제조 방법에 관한 것으로서, 기판, 기판 상에 형성되는 n형 클래딩층, n형 클래딩층 상에 형성되는 n형 SCH(Separate Confinement Heterostructure)층, n형 SCH층 상에 형성되며 사전설정된 파장 대역의 광을 발생시키기 위한 다층양자우물, 다층양자우물 상에 형성되며 광을 구속하기 위한 p형 SCH층, p형 SCH층 상에 형성되며 광의 손실을 방지하기 위한 p형 클래딩층, p형 클래딩층 상에 형성되며 옴접촉을 조절하기 위한 오믹층, 및 광을 발생시키기 위한 전류를 다층양자우물로 주입하기 위한 전극을 포함하며, n형 클래딩층은 광의 손실을 방지하고, n형 SCH층은 광을 구속하며, 다층양자우물은 사전설정된 적층 주기로 교번하여 형성된 다수의 압축 스트레인 우물층 및 다수의 긴장 스트레인 장벽층에 의해 스트레인 보상되는 단일모드형 레이저 다이오드 및 그 제조 방법을 제공한다. 레이저 다이오드, 스트레인 보상 다층양자우물, 압축 스트레인 우물층, 긴장 스트레인 장벽층, 에피 구조
Abstract:
PURPOSE: A semiconductor laser diode having an asymmetric SCH(Separate-Confinement Hetero) structure and a fabricating method thereof are provided to improve a thermal characteristic and an optical characteristic by reducing internal loss due to inserting a p-InP layer. CONSTITUTION: An n-type cladding layer(220) is formed on a substrate. An n-type second SCH layer(218) is formed on the n-type cladding layer. The first n-type SCH layer(210) is formed on the second SCH layer. An active layer(212) is formed on the first n-type SCH layer. The first p-type SCH layer(208) is formed on the active layer. The first insertion layer(206) is formed on the p-type first SCH layer. A p-type second SCH layer(204) is formed on the first insertion layer. A p-type cladding layer(202) is formed on the p-type second SCH layer.
Abstract:
PURPOSE: Provided is a PbO-ZrO2-CaO-TiO2 system dielectric ceramic composition with high dielectric constant(more than 100) for microwave products of small size and light weight such as filters, duplexer and resonators. CONSTITUTION: The microwave dielectric ceramic composition is represented by the formula, (1-y)(Pb1-xCaxZr0.9Ti0.1)O3 + ySrZrO3 (0.3