50results about How to "Achieve tunable" patented technology

The invention relates to a terahertz spectrum measuring system and a method for analyzing a terahertz spectrum of a substance. The terahertz spectrum measuring system comprises two terahertz quantum cascade lasers whose emission ports are arranged in an opposite manner and a vacuum cover arranged between the emission ports of the two terahertz quantum cascade lasers. According to the terahertz spectrum measuring system and the method for analyzing the terahertz spectrum of the substance, advantages of an on-chip dual-frequency comb system can be reserved, a terahertz dual-frequency comb is separated, and the defect that the on-chip dual-frequency comb fails to directly measure the terahertz spectrum of the substance is overcome.

The invention discloses a multi-dimensional multiplexing soliton optical fiber laser device which comprises a laser pump source and an annular laser resonant cavity consisting of a gain medium, a dispersive medium, a wavelength division multiplexer, an optical coupler, an optical circulator, a polarization controller and a polarizer. The laser pump source and the gain medium work together so as toprovide a gain amplification mechanism for laser device operation. The dispersive medium can be used for chromatic dispersion compensation of pulse laser so as to achieve chromatic dispersion management of an internal optical path of the laser device, and the optical circulator is a non-reciprocal optical transmission device for coupling the chromatic dispersion medium to construct a bidirectional transmission optical path structure. Via use of the polarization controller, a local polarization state of the internal optical path of the laser device can be changed, and mode-locking operation ofthe pulse laser and adjustment and switching of a mode-locking state can be realized. The multi-dimensional multiplexing soliton optical fiber laser device of the invention can be used for bidirectional transmission, and mode-locking laser pulses can be respectively obtained, generation of polymorphic soliton pulses can be supported, and a wideband wavelengths tuning function and a multiple wavelength switching function can be fulfilled via output laser pulses.

The invention discloses a frequency interval adjustable multi-wavelength anti-Stokes FWM fiber laser. The fiber laser is composed of a pulse light source, a continuum light source, a wavelength division multiplexer (WDM), a high reflective grating, optical fibers, a lower reflective grating and a filter. The central frequency omega p of the pulse light source is close to and smaller than the optical frequency omega o to be obtained, the wavelength of laser output by the continuum light source is adjustable, a frequency omega cw satisfies omega o=omega p+n (omega cw-mega p), the zero dispersion wavelengths of the optical fibers are smaller than the pulse optical wavelength, central wavelengths of the high reflective grating and the lower reflective grating are equal to that of the obtained laser, the central wavelength of a WDM arm connected with the pulse light source is equal to that of the pulse light source, the central wavelength of an ram connected with the continuum light source is equal to that in output light of the continuum light source, and the central wavelength of the filter is equal to the obtained optical wavelength. According to the fiber laser, the output wavelength and the frequency interval are adjustable, the adjusting range of wavelengths is large, and the output wavelength is smaller than that of a pump.

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 discloses a 2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser, and belongs to the field of laser techniques and non-linear optics. The 2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser mainly comprises a laser pumping source, a wavelength division multiplexer, thulium-holmium codoped optical fiber, a circulator, an isolator, a saturable absorber, a saturable absorber mirror, a coupler, a polarization controller, a filter, passive optical fiber, and the like. As the thulium-holmium codoped optical fiber is taken as a gain medium and the saturable absorber and the saturable absorber mirror as passive mode-locking devices, and furthermore by changing the penetration wavelength of the tunable filter, output of 2-micro wave band, tunable wavelength and short pulse is achieved. Due to adoption of the whole structure of the 2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser, all-fiber welding is achieved, and the 2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser has the advantages of simple structure, good environment stability, high efficiency and the like, and is easy in industrial application.

The invention provides a narrow-linewidth tunable laser system and an operation method thereof. A tunable laser module of the system comprises a semiconductor laser, a driving circuit and a wavelength-tunable control submodule, wherein the driving circuit and the wavelength-tunable control submodule are connected with the semiconductor laser. A switch voltage stabilizer, connected with an inductor and a diode, of a power management submodule enables positive voltage to be converted into negative voltage so as to supply electricity to the system. A microcontroller connected with a host is connected with the driving circuit through digital-to-analog conversion to transmit instructions of the host and states of the laser. The microcontroller and a power failure detection submodule are used for detecting circuit voltage of the laser at regular time, and power is recovered in time when power failure is found out. The operation method of the narrow-linewidth tunable laser system includes the steps that after being initialized, the microcontroller transmits preset default data frames to the laser, the data frames returned by the laser are read, the situation that the data frames have no error is determined, whether power failure occurs or not is detected at regular time, updated instructions of the host are received and transmitted to the laser, and the current working state information of the laser is transmitted to the host. The system only needs to be powered up by a single power supply and can be used easily in an embedded mode. A tuning control interface of the host is simple and visual, and reliable operation is guaranteed through power failure self-detection.