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    • 7. 发明专利
    • DE19508825A1
    • 1995-09-21
    • DE19508825
    • 1995-03-11
    • EASTMAN KODAK CO
    • HAAS DANIEL DILLON
    • G02B6/42H01S3/00B41J2/435G02B6/14G02B6/18H01S3/02
    • A diode laser 40 which generates both stimulated and spontaneous emission in accordance with the amount of excitation, is coupled to an optical fibre 50 having a core size and index of refraction such that only the lowest-order mode at the laser wavelength transmits the laser emission. The coupling may include optical elements 52. The optical fibre provides preferential transmission of the stimulated emission of the diode laser 40 compared to the transmission of the diode laser's spontaneous emission, and permits the enhanced extinction of the light power when the injection current supplied to the diode laser is reduced below its lasing threshold without unduly limiting the beam power transmitted thereby. Transmitting the diode laser's emission through the single-mode optical fiber creates a consistent, circularly symmetric irradiance distribution independent of the excitation supplied to the laser which simplifies the design of the subsequent optical train, eliminates the need for beam-shaping optics adusted specifically for each laser, and facilitates the exchange of faulty diode lasers.