El arrepentido y otras narraciones

Cell imaging by coherent backscattering microscopy using frequency-shifted optical feedback in a microchip laser

“…When it is correctly controlled, the optical re-injection in a laser can, however, be used in order to improve its characteristics, such as the lindwidth narrowing [2], or for metrology purpose [3][4][5][6][7][8], thus conferring on the laser the role of source and detector at the same time. Since 1963, this principle was employed in an autodyne configuration to measure distances or speeds [9,10]. More recently, a heterodyne imagery technique called LOFI (laser optical feedback imaging) was developed [11].…”