| 摘要 |
PROBLEM TO BE SOLVED: To obtain a semiconductor laser module small in size and degree of polarization, and a Raman amplifier employing the semiconductor laser module as a light source for excitation and small in size as well as the polarization depending property of a gain. SOLUTION: The semiconductor laser module has a light source or a semiconductor laser 1, and an optical fiber 5 for transmitting light outputted out of the semiconductor laser 1. In the module, a phase plate 3 for changing the condition of polarization of light outputted out of the semiconductor laser 1 is provided between the semiconductor laser 1 and the optical fiber 5. In this case, the phase plate 3 gives a deviation in a distributing condition in the surface of the phase plate 3 with respect to at least one between a delay phase axial direction high in a refractive index and a retardation value, to generate the distribution of direction of polarization depending on a place in the light beam and to cancel the polarization as a whole of the light beam. COPYRIGHT: (C)2006,JPO&NCIPI |
