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    • 5. 发明授权
    • Semiconductor laser having an optical waveguide layer including an
AlGaInP active layer
    • 具有包括AlGaInP有源层的光波导层的半导体激光器
    • US5276698A
    • 1994-01-04
    • US761069
    • 1991-09-18
    • Ichiro YoshidaTsukuru Katsuyama
    • Ichiro YoshidaTsukuru Katsuyama
    • H01L33/00H01L33/06H01S5/20H01S5/223H01S5/32H01S5/323H01S5/34H01S5/343H01S5/40H01S3/19
    • H01L33/06B82Y20/00H01L33/0062H01S5/20H01S5/34326H01S5/2004H01S5/2231H01S5/3201H01S5/3211H01S5/32325H01S5/3406H01S5/3407H01S5/40
    • A semiconductor laser comprises an optical wave guide layer including an AlGaInP active layer and AlGaInP optical confinement layers holding the active layer therebetween. A well structure of an energy band is formed and a compressive stress is applied to the activation layer by the difference between the compositions of the activation layer and the optical confinement layers. Since the compressive stress is applied to the activation layer, the oscillation threshold is lower than that of an un-strained device. Accordingly, the rise of the oscillation threshold due to the addition of Al is compensated and continuous oscillation at room temperature is attained and visible light having a wavelength of 0.67 .mu.m or lower, which has been difficult to attain in the past, is produced. The semiconductor laser having a multi-quantum well structure is manufactured by using AlGaInP or GaInP as a semiconductor material of the multi-quantum well structure and epitaxially growing by periodically changing a supply rate of only In. Through a very simple method of periodically changing the supply rate of only In, a well layer having a compressive stress applied thereto and a barrier layer having a tensile stress applied thereto are alternately grown and the activation layer having the desired strained multi-quantum well structure is produced.
    • 半导体激光器包括包括AlGaInP有源层的光波导层和在其间保持有源层的AlGaInP光限制层。 形成能带的良好结构,并且通过活化层和光限制层的组成之间的差异将压应力施加到活化层。 由于压应力施加于活化层,所以振荡阈值低于非应变器件的振荡阈值。 因此,由于添加了Al而引起的振荡阈值的上升被补偿,并且在室温下获得连续振荡,并且在过去难以获得的波长为0.67(my)m或更低的可见光是 生产。 具有多量子阱结构的半导体激光器通过使用AlGaInP或GaInP作为多量子阱结构的半导体材料并通过周期性地改变仅In的供给速率而外延生长而制造。 通过周期性地改变仅In的供给速率的非常简单的方法,施加施加压缩应力的阱层和施加到其上的拉伸应力的阻挡层交替生长,并且具有期望的应变多量子阱结构的活化层 生产。
    • 7. 发明授权
    • Multi-beam semiconductor laser with separated contacts characterized by
semiconductor mixed crystal and active layer
    • 具有分离接触的多光束半导体激光器的特征在于半导体混晶和有源层
    • US5663975A
    • 1997-09-02
    • US417272
    • 1995-04-05
    • Ichiro YoshidaTsukuru KatsuyamaJunichi Hashimoto
    • Ichiro YoshidaTsukuru KatsuyamaJunichi Hashimoto
    • H01S5/024H01S5/026H01S5/06H01S5/068H01S5/223H01S5/323H01S5/40H01S3/19
    • H01S5/4031H01S5/0028H01S5/024H01S5/02453H01S5/0261H01S5/0425H01S5/0612H01S5/068H01S5/06825H01S5/2231H01S5/32325
    • This semiconductor laser includes resistors as heating means through insulation films for generating pre-heat of substantially the same calorie as oscillation heat generated when the laser resonator are driven. When the light emitting regions as the light source are driven, first the heating means is actuated to give pre-heat to the laser resonators. After the laser resonators are driven, the heating means is stopped to decrease a calories of the pre-heat. It is preferable that the pre-heat has substantially the same calories as the above-described generated heat, but may be below the generated heat. Specifically, when all of the two laser resonators are driven, the heating means may generate a calories for one laser beam so as to suppress the heat crosstalks due to the mutual influence of the heat generation of the laser beams. In this case, the heating means stops heating only while both laser resonators are being driven, and continues heating in other cases. Thus, whether or not one and/or the other of the light emitting regions is driven, the laser chip has a substantially constant temperature, and temperature changes before and after an actuation is suppressed. As a result, laser beams of uniform output levels can be supplied to the printing unit of a laser printer.
    • 该半导体激光器包括作为加热装置的电阻器,该绝缘膜用于产生与驱动激光谐振器时产生的振荡热量基本上相同卡路里的预热。 当驱动作为光源的发光区域时,首先致动加热装置以向激光谐振器提供预热。 在驱动激光谐振器之后,停止加热装置以降低预热的热量。 优选的是,预热具有与上述产生的热量大致相同的卡路里,但可以低于产生的热量。 具体地说,当驱动两个激光谐振器的全部时,加热装置可以产生一个激光束的热量,以便抑制由于激光束的发热的相互影响而产生的热串扰。 在这种情况下,加热装置仅在两个激光谐振器被驱动时停止加热,并且在其它情况下继续加热。 因此,无论驱动发光区域中的一个和/或另一个,激光芯片具有基本上恒定的温度,并且抑制致动之前和之后的温度变化。 结果,可以向激光打印机的打印单元提供均匀输出电平的激光束。