9 results about "Semiconductor Diode Lasers" patented technology

A method for sensing gases using a semiconductor diode laser is disclosed. The method comprises: applying an electrical current pulse to a semiconductor diode laser thereby to cause the laser to produce a laser output pulse, wherein the application of the electrical pulse to the semiconductor diode laser causes an increase in temperature such that the produced laser output pulse comprises a continuous wavelength chirp over a wavelength range; providing the produced laser output pulse to the gas sample region, wherein at least part of the wavelength range of the wavelength chirp is used as a wavelength scan; and detecting optical output from the gas sample region, wherein the wavelength chirp is caused, at least in part, by the increase in temperature of the laser induced by the applied electrical pulse, and wherein the electrical current pulse comprises an electrical pulse length, or duration, of at least 5 microseconds and / or wherein the length of the electrical current pulse causes the increase in temperature to slow over the length of the current pulse thereby causing the rate of change of the continuous wavelength chirp to continuously slow over the length of the pulse from a first initial rate to a second, slower rate, and wherein the detection and / or further sampling of the optical output is performed at the second, slower rate.

The application discloses a photosensitizer and tissue oxygen synchronous measurement device, and belongs to the technical field of photoelectric measurement. The application uses a semiconductor diode laser as an excitation source, the emission wavelength of which is determined according to the absorption characteristics of oxygen sensing material and photosensitizer, a laser beam is coupled into a detection optical fiber to form excitation light through optical components, so that the excitation light can excite the oxygen sensing material and the photosensitizer at the same time, the oxygen sensing material with near-infrared emission is used, the phosphorescence emission wavelength of which is far away from the fluorescence of the photosensitizer, the spectral intensity of near-infrared is used to determine the tissue oxygen concentration, the spectral intensity of red light is used to determine the concentration of the photosensitizer, in addition, the fluorescence and phosphorescence of the oxygen probe are both oxygen-dependent, so that the fluorescence intensity of the oxygen probe in the red light region can be accurately removed, thereby avoiding the influence of the fluorescence intensity of the oxygen probe on the detection of the photosensitizer fluorescence, and then realizing that the fluorescence for characterizing the photosensitizer concentration and the phosphorescence for characterizing the oxygen concentration are not overlapped, and realizing the synchronous measurement of the photosensitizer and the tissue oxygen.

A method of sensing a gas using a semiconductor diode laser, the method comprising applying a current pulse to the semiconductor diode laser, thereby causing the laser to generate a laser output pulse, where applying the electrical pulse to the semiconductor diode laser results in an increase in temperature, the generated laser output pulse comprises continuous wavelength chirp in a wavelength range; providing the generated laser output pulse to the gas sample region, wherein at least a portion of the wavelength range of the wavelength chirp is used as a wavelength scan; the wavelength chirp is at least partially caused by an increase in laser temperature caused by the applied electrical pulse, the current pulse comprises an electrical pulse length or duration of at least 5 microseconds, and / or the length of the current pulse causes the increase in temperature to slow over the length of the current pulse, the continuous wavelength chirp is continuously slowed over the length of the pulse from an initial first rate of change to a second, slower rate of change, and wherein the detection and / or further sampling of the light output takes place at the second, slower rate of change.

The disclosed high-index-contrast single spatial mode edge-emitter semiconductor diode laser includes a substrate a ridge structure on the substrate that has an optical guiding region containing a quantum well active region sandwiched between cladding layers. An oxide may surround the ridge structure. A thickness of the optical guiding region may be less than a thickness of the cladding layers such that an empty space around the optical guiding region is maintained. Various other methods, systems, and devices are also disclosed.

The application relates to the field of semiconductor optoelectronics, and aims to solve the problems of limited spectrum bandwidth and complex perturbation system of existing semiconductor diode lasers, and provides a chaotic laser generation device based on a transistor laser collector current feedback structure, which comprises a transistor laser, an adder, a current source, a voltage source and an optical output port.The base electrode of the transistor laser is connected with the output port of the adder, the emitter electrode is connected with the negative electrode of the voltage source and the input end of the current source, the collector electrode is connected with the positive electrode of the voltage source and the first input end of the adder, and the second input end of the adder is connected with the output end of the current source.The chaotic laser signal with a standard bandwidth of 50GHz and a flatness better than 3dB can be generated, and the chaotic laser signal can be applied to the fields of chaotic synchronization and secret optical communication, high-speed random number key generation, laser radar, fiber network fault detection, ultra-wideband technology and distributed fiber sensing.

The invention discloses preparation and application of an extracellular multi-ion real-time monitoring sensor capable of being used for detecting cell damage and ion change in a recovery process, and belongs to the technical field of biosensing. The preparation method of the multi-ion real-time monitoring sensor comprises the following steps: carrying out patterning treatment on a polyimide film through a semiconductor diode laser engraving system, and engraving a carbon electrode; connecting the obtained carbon electrodes in pairs by using a conductive copper wire, bonding the carbon electrodes by using conductive silver paste, and then coating the surface of the conductive silver paste with polydimethylsiloxane to serve as a passivation layer; bonding a hollow ring body, wherein the hollow ring body intersects with all the conductive copper wires, and half of the carbon electrode is contained in the hollow inner part of the hollow ring body; and finally, modifying the carbon electrode in the hollow ring body to obtain the multi-ion real-time monitoring sensor.

A method for sensing gases using a semiconductor diode laser, the method comprising: applying an electrical current pulse to a semiconductor diode laser thereby to cause the laser to produce a laser output pulse, wherein the application of the electrical pulse to the semiconductor diode laser causes an increase in temperature such that the produced laser output pulse comprises a continuous wavelength chirp over a wavelength range; providing the produced laser output pulse to the gas sample region, wherein at least part of the wavelength range of the wavelength chirp is used as a wavelength scan; and detecting optical output from the gas sample region, wherein the wavelength chirp is caused, at least in part, by the increase in temperature of the laser induced by the applied electrical pulse, wherein the electrical current pulse comprises an electrical pulse length, or duration, of at least 5 microseconds and / or wherein the length of the electrical current pulse causes the increase in temperature to slow over the length of the current pulse thereby causing the rate of change of the continuous wavelength chirp to continuously slow over the length of the pulse from a first initial rate to a second, slower rate, and wherein the detection and / or further sampling of the optical output is performed at the second, slower rate.

A method for producing light of a specified wavelength includes irradiating a dye solution present in a cuvette with a semiconductor diode laser source to emit laser light. A system for producing a light of a specified wavelength includes a semiconductor diode laser source, an optical chopper, a cylindrical lens, a dye preparation unit, a grating, and a dye solution pump. The dye preparation unit includes a rotator and a cuvette loaded with a dye solution, which includes a dye solution. The dye solution comprises a natural oil selected from moringa, avocado, almond, castor, pumpkin, lemon oils, or combinations thereof, with dissolved dye at concentrations of 1-3 μg / mL. This configuration enables enhanced amplified spontaneous emission intensity at elevated temperatures while maintaining photochemical stability.

The invention provides a escaping carbon emission AR imaging device, a gas leakage detection method and application, and belongs to the technical field of gas detection devices. The wearable device comprises a wearable device body which is provided with a communication device and an AR imaging device; and the tunable diode laser radar sensor is used for collecting and analyzing three-dimensional distribution and concentration information of the escape carbon emission gas in the surrounding space and transmitting the three-dimensional distribution and concentration information to the AR imaging device for display through the communication device. According to the tunable diode laser radar sensor, the tunable diode laser absorption spectrum technology is combined with differential absorption laser radar and time-dependent single photon counting, and long-distance spectrum detection and distance measurement of a low-power semiconductor diode laser are achieved. Based on the laser reflection theory and the spectral analysis method, the problem of limitation of the imaging distance range in the prior art is solved, the imaging range of the detection system is expanded, and the position and concentration of the gas are determined by utilizing the three-dimensional image of the gas and the physical environment occupied by the gas.