Laser Diode Microlens

A laser diode with an integrated microlens acts as virtual point source vps and the beam behaves like it was emitted from the virtual point source with divergence angle q.

Laser diode microlens.

Ldm 4980 series laser diode mount setup duration. Mosfets and transistors with arduino duration. Multi channel optical communication systems require microlens arrays for coupling between laser sources fiber and waveguide arrays optical multiplexing and optical switching. 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.

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. All the aberrations are corrected and the beam has circular beam profile. Article osti 6431717 title microlens frames for laser diode arrays author skidmore j a and freitas b l abstractnote monolithic microlens frames enable the fabrication of monolithic laser diode arrays and are manufactured inexpensively with high registration and with inherent focal length compensation for any lens diameter variation. 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.

Experimental results on coupling efficiency and the loss penalty due to. Dronebot workshop 190 971 views. Newport corp by mks 775 views. 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.

The study is carried out in absence and presence of possible transverse and angular misalignments. 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. Lawrence livermore national laboratory llnl has actively pursued optical efficiency and engineering improvements in this technology in an effort to supply large radiance. 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.

Different kinds of microlenses are fabricated on fiber tips in order to maximise laser to fiber coupling.