Which process gives the laser its special properties as an optical source?

Related MCQs

• An injection laser has active cavity losses of 25 cm-1 and the reflectivity of each laser facet is 30%. Determine the laser gain coefficient for the cavity it has a length of 500μm.
• The optical source used in a fiber is an injection laser with a relative spectral width σλ/λ of 0.0011 at a wavelength of 0.70μm. Estimate the RMS spectral width.
• A semiconductor laser crystal of length 5 cm, refractive index 1.8 is used as an optical source. Determine the frequency separation of the modes.
• A GaAs injection laser with an optical cavity has refractive index of 3.6. Calculate the reflectivity for normal incidence of the plane wave on the GaAs-air interface.
• 2 BASIC OPTICAL LAWS AND DEFINITIONS, OPTICAL MODES AND CONFIGURATIONS
•                        measurements give an indication of the distortion to the optical signals as they propagate down optical fibers.
•                  couplers combine the different wavelength optical signal onto the fiber or separate the different wavelength optical signal output from the fiber.
• A GaAs injection laser has a threshold current density of 2.5*103Acm-2 and length and width of the cavity is 240μm and 110μm respectively. Find the threshold current for the device.
•                                      in the laser occurs when photon colliding with an excited atom causes the stimulated emission of a second photon.
• Longitudinal modes contribute only a single spot of light to the laser output.