Tunable laser for outputting non-polarized light

Abstract

A tunable laser for outputting non-polarized light comprises a first reflection mirror (72), a broadband laser gain medium (76), a tunable Fabry-Perot filter (400), a tunable acoustooptic filter (500), a second reflection mirror (84), a third reflection mirror (86), and a laser control circuit (88). A broadband light beam sent by the broadband laser gain medium (76) is filtered by the tunable Fabry-Perot filter (400) and then is filtered by the tunable acoustooptic filter (500). A first-grade diffraction light beam of the tunable acoustooptic filter (500) is divided into two beams of polarized light with polarization states perpendicular to each other, and a zero-grade diffraction light beam of the tunable acoustooptic filter (500) serves as an output light beam of the laser. The tunable laser for outputting non-polarized light implements continuous, rapid and precise tuning on the output light of the laser in a wide spectral range, has characteristics of absence of mechanical movement parts, high electronic tuning speed, stable and reliable performance, small sizes, easiness in mounting and production and the like, and can be widely applied in the fields of lasers, optical testing, optical fiber communications, biological and medical instruments, optical fiber sensor networks and the like.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, in particular to a tunable laser with non-polarized light output. Background technique [0002] Because the grating has high spectral resolution in a large spectral range, it is widely used in various tunable lasers. The existing problems are: since a precision stepping motor is required to drive the grating for scanning, the tunable laser using this technology is relatively large in size, easily affected by mechanical vibration, and expensive. [0003] The traditional optical Fabry-Perot etalon is a filter device made by the principle of multi-beam interference. There are two main types: one is air-spaced, and the other is optical glass-spaced. Through the multi-beam interference effect of the Fabry-Perot cavity formed by the high reflectivity of the multi-layer dielectric film on the two light-passing surfaces, the multi-wavelength narrow-band filter output in a wide spectrum range can...

AI Technical Summary

Problems solved by technology

The existing problems are: since a precision stepping motor is required to drive the grating for scanning, the tunable laser using this technology is relatively large in size, easily affected by mechanical vibration, and expensive

Therefore, it is difficult to achieve a narrowband output with a tunable laser using only an acousto-optic filter

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