Laser module for coherent laser radar

Abstract

The invention discloses a laser module for a coherent lidar. The invention provides a laser module for a coherent laser radar. Only one continuous laser is needed as a seed light source and one laser pulse modulation module is needed, multiple paths of local oscillation light and signal light can be output at the same time, and therefore multi-beam and multi-angle target detection is achieved. By adopting the scheme of the invention, not only is the compactness of the overall structure of the laser improved, but also the power consumption and the cost are reduced. The input light sources of multiple paths of signal light are from the same light source, so that the consistency of various parameters of the output laser is effectively ensured. Besides, the single seed source module brings a single pulse time sequence reference, and the unique time sequence reference can be used for accurately controlling the light emitting delay of a subsequent light path, thereby greatly improving the receiving, transmitting and measuring precision of the laser radar system.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a laser module for coherent laser radar. Background technique [0002] The existing narrow-linewidth nanosecond pulsed fiber lasers used for lidar are usually 1X1 modules, that is, a seed source module and an optical amplifier module. The inventors of the present invention have found through research that: since a single optical amplifier module is mounted on a radar transmitter, the measured range is limited, and multiple 1X1 modules are placed in a measurement system, not only the cost is very high, but also because the timing reference of each module is different Similarly, it is difficult to precisely modulate the laser pulse delay of each optical amplifier module, so it is difficult to achieve large-scale, high-precision measurement. Contents of the invention [0003] In order to solve the above problems, the present invention provides a laser module for coherent lidar, in...

AI Technical Summary

Problems solved by technology

The inventors of the present invention have found through research that: since a single optical amplifier module is mounted on a radar transmitter, the measured range is limited, and multiple 1X1 modules are placed in a measurement system, not only the cost is very high, but also because the timing reference of each module is different Similarly, it is difficult to precisely modulate the laser pulse delay of each optical amplifier module, so it is difficult to achieve large-scale, high-precision measurement

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