Round-trip gain equals round-trip loss: 2g L = −ln(R_1 R_2) + 2αL, where R_i are mirror reflectivities and α is distributed loss. Pumping above threshold gives coherent emission; below threshold the device is just a noise lamp.
Round-trip gain equals round-trip loss: 2g L = −ln(R_1 R_2) + 2αL, where R_i are mirror reflectivities and α is distributed loss. Pumping above threshold gives coherent emission; below threshold the device is just a noise lamp.