2 results about "Far-infrared laser" patented technology

This invention relates to the field of laser technology, and particularly to a Raman laser that outputs 9.2μm far-infrared laser light. It includes a laser pump beam splitting module, a first-order Raman laser generation module, a difference-frequency seed light preparation module, a laser beam combining and tuning module, a second-order Raman amplification module, and a laser collimation and separation module arranged sequentially along the optical path. The laser pump beam splitting module is used to achieve beam splitting and control of the 1064nm laser; the first-order Raman laser generation module is used to generate a 1.9μm first-order Raman laser from hydrogen; the difference-frequency seed light preparation module is used for difference-frequency preparation of the 9.2μm Raman seed light; the laser beam combining and tuning module is used for spatiotemporal overlap and beam combining of the pump light and the seed light; the second-order Raman amplification module is used for Raman amplification of the 9.2μm laser; and the laser collimation and separation module is used for collimation and separation of the target laser output. This invention utilizes a difference-frequency method to generate wavelength-matched far-infrared Raman seed light, and performs Raman amplification to ultimately obtain a 9.2μm far-infrared Raman laser with high pulse energy and high peak power.

The application discloses a dynamic fixed-point number adaptive PID design method based on error amplitude feedback, which is characterized in that a PID controller detects the amplitude of a current frequency error in real time, and dynamically adjusts the bit width distribution mode of a fixed-point number in a PID operation process according to an error interval, so that the controller has stronger dynamic range in a large error stage, has higher operation resolution in a small error stage, and better balances the fast regulation ability and the steady-state control precision of a system. Specifically, the method comprises the following steps: (1) obtaining the real-time frequency of a signal through fast Fourier transform, and saving a reference frequency value transmitted by an upper computer; (2) comparing the reference frequency with the actual signal frequency to obtain the frequency error at the current time, judging the error interval in which the current system is located according to a threshold value, and switching to a corresponding fixed-point format; (3) completing proportional, integral and differential operations according to the incremental PID control, selecting the corresponding control shift bit number according to the fixed-point format, and calculating the control increment between adjacent two sampling time points and the output control amount of the PID. Through real-time feedback of the error amplitude, the method dynamically optimizes the numerical expression precision of the PID calculation, so that the controller can automatically match a more suitable operation format according to the current error interval. In a laser frequency stabilization system, the dual requirements of large disturbance fast response and steady-state high-precision locking can be met, and the long-term stable operation requirement of a far-infrared laser interferometer is better adapted.