Shanghai Laser & Optics Century Co., Ltd. (SLOC) | Laser | Manufacturer of DPSS Green Laser, Blue Laser, Red Laser, Yellow Laser, Infrared Laser, UV Laser | 635nm and 650nm Laser Modules | Laser Diode | Scanner, Line Lens, Combiner, Beamsplitter, Filter, Rod Lens, Ball Lens | Fiber Coupled, RGB Laser, Low Noise, SLM, Line Laser, Laser Pointer, Portable Laser

Fiber Coupler

Optical Fiber couplers are optical components that are designed to allow a free‐space laser beam to efficiently enter an optical fiber. Their design is simple: A focusing optic is used to reduce the beam to as small a waist as possible, and the input aperture of the optical fiber is attached at the focal point so that the largest amount of optical power possible is sent into the fiber.

The fiber coupler mounts directly to our lasers, allowing for easy attachment of a fiber optic cable with a male FC/PC or SMA905 connector. The coupler uses optics to focus the laser beam down to a very small spot at the fiber aperture, allowing for optimal coupling efficiency to fibers. The fiber cable can be easily attached and removed with minimal readjustment. If the fiber tip is not perfectly aligned with the focal point of the coupler, the user can adjust the coupling alignment to achieve the desired coupling efficiency.

Key Features

Anti-reflective coated optics for maximum transmission efficiency.
User-adjustable alignment of coupling optics in 3 axes (x,y,z).
Threads directly on to the laser aperture, no tools required.
Can be purchased separately, or installed on a laser and aligned to a given fiber type.

Fiber Coupling Efficiency - DPSS Laser
	100µm MM Fiber	200µm MM Fiber	400µm MM Fiber
TEM₀₀ Beam Mode	>75%	>80%	>90%
Multi transverse mode	>70%	>80%	>90%
Fiber Coupling Efficiency - Diode Laser
Single-Mode LD	>75%	>80%	>90%
Multi-Mode LD	>70%	>80%	>90%

Laser Products
Model	Focus the Beam to	Connector	Fiber can be used
FCR-100-PC	<100μm	FC/PC	≥100μm MM fiber
FCR-100-SMA	<100μm	SMA905	≥100μm MM fiber
To maximize the amount of laser light entering the fiber, the coupler is aligned before shipping, but couplers may become misaligned during shipping and when used or stored in areas with vibration or large changes in temperature. If your laser is not producing the expected level of output at the output aperture of the optical fiber, realignment may be needed. For lasers with output power above 3W, we strongly recommend using the SMA connector type in order to maximize coupling efficiency and prevent damage to the fiber. For low-power lasers (≤500 mW), the FC/PC connector type ensures consistent rotational orientation. This provides better repeatability in terms of coupling efficiency if the fiber is to be removed and re-inserted multiple times. SMA connectors are preferable for lasers with higher power, but they do not provide this benefit.