1. A monitored laser system, comprising: a laser comprising a first mirror, an exit mirror, at least a portion of a laser cavity defined by the first mirror and the exit mirror; and an active region located in the laser cavity, the active region containing a material that is capable of stimulated emission at one or more wavelengths of laser light; a multiple reflectivity band reflector (MRBR) coupled to at least a portion of laser light emitted from the laser and transmitting filtered laser light, the MRBR having at least first and second wavelength bands with reflectivity above a particular reflectivity separated by at least a third wavelength band having reflectivity below the particular reflectivity; a first photodiode coupled to at least a portion of the filtered laser light and producing an output based on the amount and wavelength of light received; and means for adjusting the emitted wavelength of the laser toward a particular wavelength in one of the at least first, second, and third wavelength bands based at least in part on the output of the first photodiode.