High-performance swept-frequency fiber laser

Abstract

The invention provides a high-performance swept-frequency fiber laser. The high-performance swept-frequency fiber laser comprises a semiconductor optical amplifier, a first isolator, a second isolator, a polarization controller, a filter, a first coupler, a first circulator, a second circulator, a third circulator and a first rotating mirror. An optical signal reaches the first rotating mirror after being acted by the filter, and passes through the filter again after being reflected by the first rotating mirror, so the same optical signal can obtain a better filtering effect after being filtered twice. A first delay line and a second coupler are added in the optical path to form the second path, and the optical signal can pass through the filter again to achieve a multiple filtering effect. The optical channel is provided with a frequency sweep doubling assembly, so that the frequency sweep speed can be improved by multiple times. The semiconductor optical amplifier is connected with aconstant current driving circuit and a temperature control circuit, so that the semiconductor optical amplifier is ensured to continuously and stably output spontaneous radiation background light, and laser output is not interrupted due to long operation time and over-high temperature, therefore the stability of the whole system is improved.

Description

Technical field [0001] The invention relates to the field of fiber lasers, in particular to a high-performance frequency swept fiber laser. Background technique [0002] Optical coherence tomography can "non-invasively" obtain the internal structure of biological tissues, and the swept laser is the core component of the new generation of optical coherence tomography. The output parameters of the frequency sweep laser directly determine the effect of optical coherence tomography. Fiber-optic biomedical sensing technology combines fiber-optic sensing technology with biomedical detection technology to realize real-time detection in vivo. The time-domain information output by the swept laser can be directly displayed, which greatly improves the detection efficiency and resolution, and can give accurate detection results of cells, making it one of the best lasers for biomedical sensing. [0003] In the current technology, short-cavity swept lasers have the problems of slow sweep speed...

AI Technical Summary

Problems solved by technology

[0003] In the current technology, short-cavity frequency-sweeping lasers have the problems of slow frequency-sweeping speed and low reuse rate of devices

Fourier-domain film-locked frequency-sweeping lasers have a huge structure and require extremely long delay lines to increase the frequency-sweeping speed. At the same time, long delay lines bring great loss, making miniaturization and productization difficult, and the frequency-sweeping parameters are not very good. to optimize

The frequency-sweeping laser tuned by the grating polygon mirror has a frequency-sweeping speed that depends on the mechanical structure of the driving polygon mirror. It is difficult to increase the speed, it is difficult to adjust the optical path, and it is difficult to guarantee the stability of the output laser.

Images