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    EXTERNAL CAVITY TUNABLE LASER WITH AN AIR GAP ETALON COMPRISING WEDGES
    2.
    发明公开
    EXTERNAL CAVITY TUNABLE LASER WITH AN AIR GAP ETALON COMPRISING WEDGES 有权
    可调谐外腔式激光器和气柱管WITH TALON KEILEN

    公开(公告)号：EP2235579A1

    公开(公告)日：2010-10-06

    申请号：EP08865429.8

    申请日：2008-12-22

    申请人： Renishaw PLC

    发明人： COPNER, Nigel ,  EL DAH DAH, Nayla

    IPC分类号： G02B26/00 ,  H01S3/106 ,  H01S5/14 ,  H01S3/08

    CPC分类号： H01S3/1062 ,  G02B26/001 ,  H01S3/08036 ,  H01S5/141

    摘要： A tunable narrow linewidth laser is provided, wherein an adjustable etalon structure (20) is employed to simultaneously tune the wavelength of the laser transmission and the length of the laser cavity. The etalon structure (20) is an effective, relatively thick shear plate comprised of transparent matched wedge-shaped substrates (24a, 24b) and a pair of parallel, partially transmissive mirrors (22a, 22b) with a space therebetween. Rotation of the etalon structure (20) relative to the laser input changes the angle of incidence to the first substrate (24a) and the etalon angle, thereby changing the wavelength of the laser light and also changing the length of the external laser cavity. Thus, reliable frequency tuning is achieved, without mode hopping. The invention is defined in terms of the more general concept that mode hopping during frequency tuning can be eliminated by changing the wavelength and the length of the laser cavity simultaneously by selectively altering the angle of incidence of the laser input on a wavelength discriminating structure, such as an etalon structure, positioned within the optical path of a laser system.