Fiber multimode laser with reduced noise

Details Fiber multimode laser with reduced noise Fiber multimode laser with reduced noise

1996-11-12

1998-09-08

Davie, James W.

Coherent light generators

Optical fiber laser

372102, H01S 310

Patent

active

058056211

ABSTRACT:
Applicants have discovered that the intermodal beat noise of a fiber multimode laser can be substantially reduced by providing the fiber with an output coupler of broadened bandwidth. In a preferred embodiment, a reduced-noise, high power light source comprises a cladding pumped fiber laser having a chirped output grating. Experiments show that increasing the output bandwidth from 0.254 to 0.577 nm reduces the relative intensity-to-noise ratio 10 dB in a Nd-doped fiber laser. Increasing the bandwidth from 0.2 nm to 0.3 nm in a Yb-doped laser similarly reduces the noise by 12 dB.

REFERENCES:
patent: 5668821 (1997-09-01), Hodgson et al.

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