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Simply switching between lasers changes the wavelength in a coarse manner. Like most wavelength controlled telecommunication lasers, the laser chip is mounted on a thermoelectric cooler to stabilize the temperature. By making small adjustments to the inside temperature of the package, fine tuning of the wavelength can be realized.
The intensity-modulated optical signal is generated by modulating the amplitude or the current of the light source, typically a laser diode with one or two cavity designs such as Fabry-Perot or distributed feedback (DFB). [5] At the receiver end, direct detection (DD) is used to recover the modulated signal.
The resulting image is a convolution of the ideal image with the Airy diffraction pattern due to diffraction from the iris aperture or due to the finite size of the lens. This leads to the finite resolution of a lens system described above.
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The Strehl ratio is a measure of the quality of optical image formation, originally proposed by Karl Strehl, after whom the term is named. [1] [2] Used variously in situations where optical resolution is compromised due to lens aberrations or due to imaging through the turbulent atmosphere, the Strehl ratio has a value between 0 and 1, with a hypothetical, perfectly unaberrated optical system ...
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In laser science, the parameter M 2, also known as the beam propagation ratio or beam quality factor is a measure of laser beam quality. It represents the degree of variation of a beam from an ideal Gaussian beam. [1] It is calculated from the ratio of the beam parameter product (BPP) of the beam to that of a Gaussian beam with the same wavelength.
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