Laser Diode Microlens

We present a theoretical investigation of coupling optics involving a laser diode and circular core graded index single mode fiber via a parabolic microlens on the fiber tip to predict the nature of suitable refractive index profile for the first time in connection with optimum coupling.

Laser diode microlens.

The ability to condition the radiance of laser diodes using shaped fiber cylindrical microlens technology has dramatically increased the number of applications that can be practically engaged by diode laser arrays. Different kinds of microlenses are fabricated on fiber tips in order to maximise laser to fiber coupling. The lowest coupling loss 3 db has been achieved by using a 1 3 μm ingaasp buried heterostructure laser diode and a single mode fiber. Fibers with different kinds of core and index as well as different kinds of microlens on the fiber tip were comprehensively investigated to improve the coupling efficiency between the laser diode and the microlens fiber.

All the aberrations are corrected and the beam has circular beam profile. Further a microlens can cause maximum coupling if it has sufficiently large aperture so as to collect the entire incident light its transformed spot size matches the laser spot size and it will have no spherical aberration 1 2. The details of which have been shown in table 1 among the commonly used single mode fiber including circular core and elliptic core the former is more widely used. Experimental results on coupling efficiency and the loss penalty due to.

Direct diode to fiber coupling has recently been demonstrated for a medical application in which 22 w of cw 690 nm radiation was delivered from a microlens conditioned stack of algainp laser diode bars through a 1 mm core fused silica fiber. Multi channel optical communication systems require microlens arrays for coupling between laser sources fiber and waveguide arrays optical multiplexing and optical switching. Simple conical microlenses are fabricated on the end of a vapor axial deposition single mode fiber to increase the coupling efficiency between the laser diode and the single mode fiber. Dronebot workshop 190 971 views.

Powerphotonic s microlens arrays are the ideal lens solution providing a precise and monolithic component for array collimation and coupling. Ldm 4980 series laser diode mount setup duration. Lawrence livermore national laboratory llnl has actively pursued optical efficiency and engineering improvements in this technology in an effort to supply large radiance. Mosfets and transistors with arduino duration.

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