40results about How to "Laser output is stable" patented technology

The invention relates to an external cavity type broadband tunable laser coupling a filter with double laser gain media, comprising a first laser gain medium, a first intracavity collimating lens, an active optical phase modulator, a tunable acousto-optic filter, an intracavity reflecting mirror, an optical etalon and an intracavity totally reflecting mirror which are sequentially mounted in a laser cavity, a second laser gain medium, a second laser cavity end mirror and a second intracavity collimating lens which are mounted on the second laser gain medium, a multi-layer medium film optical filter for coupling output light beams of the first laser gain medium and the second laser gain medium, a radio frequency signal source, pump sources of the two laser gain media, a driving source of the active optical phase modulator, and a laser driving control circuit. The external cavity type broadband tunable laser is reasonable in design, realizes the function of enabling the output spectrum range of the single laser to cover C and L spectral bands, expands the output spectrum range of the tunable laser, and has the characteristics of stability and reliability in performance, low cost, small size, easiness in mounting and production and the like.

A single-frequency fiber laser in the form of a tunable narrow-linewidth array. The fiber laser comprises a semiconductor laser chip array portion (1), a tunable narrow-linewidth single-frequency fiber laser array portion, and a miniature short fiber power amplification portion. The fiber laser can simultaneously achieve output of array single-frequency fiber lasers with a laser wavelength channel spacing of 100 GHz, single-transverse mode power being larger than or equal to 100 mW, a signal to noise ratio being larger than or equal to 65 dB, and narrow-linewidth being smaller than or equal to 10 kHz. A tunable function of central wavelength or output ways of each narrow-linewidth single-frequency fiber laser output unit can be effectively achieved based on precise temperature control technologies and selective pumping source working control modes, and accordingly real-time and effective tuning of output wavelength coverage formed by single-frequency fiber lasers in the form of a narrow-linewidth array can be achieved. The fiber laser can be widely used for coherent light communication and an application field where high-precision sensing and detection are simultaneously carried out on a plurality of targets.

The invention provides a fiber laser frequency stabilization system using fast and slow locking, which includes an ultra-narrow linewidth fiber laser, an acousto-optic modulator, a phase modulator, a quadrature demodulation device and a feedback control device. It is characterized in that the laser output from the ultra-narrow linewidth fiber laser is modulated by an acousto-optic modulator and a phase modulator in sequence. After being input into a fiber grating Fabry-Perot interference cavity through a circulator, it is demodulated through a quadrature demodulation circuit. The slow PID controller is used to adjust the wavelength of the light source to compensate low frequency signals; the fast PID controller is used to adjust the acousto-optic modulator to compensate high frequency signals. This scheme can overcome the limitations of the frequency modulation response and frequency modulation bandwidth of the fiber laser, and realize the stable tracking between the output wavelength of the fiber laser and the reference resonant cavity.

The invention belongs to the technical field of manufacturing of engine cylinder sleeves, and provides an automobile engine cylinder sleeve laser cutting machine tool. The automobile engine cylinder sleeve laser cutting machine tool comprises a rack. A material ejecting device, a rotary chuck mechanism, a laser cutting head assembly, a material pushing mechanism, a material pushing control system and a baffle arm are arranged on the rack, wherein the baffle arm is over against the discharge port of the rotary chuck mechanism. The material pushing control system controls the material pushing mechanism to linearly move, after the material ejecting device ejects and pushes cylinder sleeve raw materials, the central axis of the rotary chuck mechanism, the central axes of the cylinder sleeve raw materials and the central axis of the material pushing mechanism are overlapped, and the laser cutting head assembly is located above the discharge port of the rotary chuck mechanism. Due to the fact that the laser cutting technology is adopted for the machine tool, cutting joints are thin, the raw materials are saved, maintenance cost is low, the rate of finished cylinder sleeve products is high, and environment pollution is avoided.

The invention discloses a coherent combination of a high-power fiber laser full optical fiber structure and a high brightness beam controlling method. The method includes that firstly a laser is in a multiple-path single mode auxiliary laser beam combined structure, an auxiliary light source in each path is amplified, and one of phase modulating devices is arranged in each path and can achieve a phase locking function to achieve a stable output of optical fields; then an optical fiber beam combiner is used for performing a beam combination of multiple-path amplified lasers into a transmitting energy fiber, and the transmitting energy fiber is utilized to achieve high power output of the lasers; and by means of an optimization type self-adaptive optical system, emergent multi-mode lasers are purified at an output end of the transmitting energy fiber. According to the method, a novel structure is utilized to step by step achieve high power and high brightness outputs of the fiber laser, thereby requirements of traditional coherent combinations for auxiliary light beam space splicing are met, problems that instability of a system, poor qualities of multi-mode fiber laser beams and the like are solved, the brightness of output lasers of the fiber laser is effectively improved, simultaneously the full optical fiber structure is achieved, the proven single mode fiber laser technology and light beam purification technology are fully utilized, the system structure of a high power fiber laser is simplified, and the system cost is lowered.