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Effect of local pumping on random laser modes

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arxiv physics/0701193 v1 pith:TG6F6PYG submitted 2007-01-17 physics.optics

Effect of local pumping on random laser modes

classification physics.optics
keywords localmodesquasimodesgainlasingrandomregimessystem
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have developed a numerical method based on the transfer matrix to calculate the quasimodes and lasing modes in one-dimensional random systems. Depending on the relative magnitude of the localization length versus the system size, there are two regimes in which the quasimodes are distinct in spatial profile and frequency distribution. In the presence of uniform gain, the lasing modes have one-to-one correspondence to the quasimodes in both regimes. Local excitation may enhance the weight of a mode within the gain region due to local amplification, especially in a weakly scattering system.

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