A system of controlling a wavelength of a laser beam is provided. The system comprises a stage for supporting a wafer, an optical convergence unit for emitting the laser beam moving in an optical path toward the stage, and a specific wavelength detecting sensor. The specific wavelength detecting sensor is disposed between the optical convergence unit and the stage. It includes a laser beam absorbing structural body for absorbing a specific wavelength of the laser beam emitting toward the stage. A wavelength controlling unit for selectively controlling the wavelength of the laser beam is also provided.

 
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> Optical assembly comprising multiple semiconductor optical devices and an active cooling device

> Systems and methods for real-time compensation for non-linearity in optical sources for analog signal transmission

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