__________________ may be improved through the use of frequency-selective feedback so that the cavity loss is different for various longitudinal modes.

Related MCQs

• An injection laser has active cavity losses of 25 cm-1and the reflectivity of each laser facet is 30%. Determine the laser gain coefficient for the cavity it has a length of 500μm.
• A ruby laser has a crystal of length 3 cm with a refractive index of 1.60, wavelength 0.43 μm. Determine the number of longitudinal modes.
• Longitudinal modes contribute only a single spot of light to the laser output. State whether the given statement is true or false.
• Device which apply the frequency-selective feedback technique to provide single longitudinal operation are referred to as ________________
• A number of three-port single-mode fiber couplers are used in the fabrication of a ladder coupler with 16 output ports. The three-port couplers each have an excess loss of 0.2 dB along with a splice loss of 0.1 dB at the interconnection of each stage. Determine the excess loss.
• A step index fiber has a coupling efficiency of 0.906 with uniform illumination of all propagation modes. Find the insertion loss due to lateral misalignment?
• A graded index fiber has a parabolic refractive index profile (α=2) and core diameter of 42μm. Estimate an insertion loss due to a 2 μm lateral misalignment when there is index matching and assuming there is uniform illumination of all guided modes only.
• _________ is the stimulation of oxide formation by means of non-isothermal plasma maintained at low pressure in a microwave cavity surrounding the tube.
• It is a resonant cavity formed by two parallel reflecting mirrors separated by a mirror separated by a medium such as air or gas
• The lasing output of the basic Fabry-perot cavity fiber is restricted to between ____________