Characteristics and dynamics of a passively stabilized high power and narrow-bandwidth broad-area laser coupled to an external variable length cavity
We have constructed an external cavity diode laser (ECDL) with an easily adjustable, variable cavity length in the Littman-Metcalf configuration to improve the poor beam quality of a 2 W Coherent Inc. broad-area laser (BAL) as well as study the effect of varying dispersive feedback. Our results at four different cavity lengths show that the individual modal linewidth varies with an L -1/2 cavity length dependence while the effective bandwidth of the ECDL was not altered. This suggests that BALs behave differently in external cavities. We describe the detailed characteristics of our ECDL and the passive stabilization techniques employed to keep the laser at a fixed wavelength for long periods, which is important for our intended application to spin-exchange optical pumping experiments using a Rb- ^129 Xe mixture. We discuss other applications of this laser that include high-resolution spectroscopy and laser cooling, and provide a review of BAL coupling techniques.
School Location:USA - Ohio
Source Type:Master's Thesis
Keywords:high power diode laser broad area bal variable external cavity spin exchange polarization passive stabilization littman metcalf characterization
Date of Publication:01/01/2005