10 results about "Laser diode" patented technology

A method for preserving a mechanical alignment of a semiconductor laser (100) by use of a temperature control system (101). The semiconductor laser includes an optical mount (110) for mounting a semiconductor laser diode (131) and optical components (132,133). A thermal device (140) and a temperature sensor (180) are used for heating or cooling the optical mount and the semiconductor laser. The method includes adjusting the temperature of the semiconductor laser at a rate less than a predetermined temperature rate by use of the thermal device so as to minimise temperature-related faults, wherein the predetermined temperature rate is experimentally determined and is adapted to the semiconductor laser.

In a laser module (310), single-emitter laser diode chips (110) are positioned at different heights on opposite sides of the module's combined output beam (114). Each laser diode chip (110), and its corresponding fast and slow axis collimators (130, 134), and turning mirror (140) are positioned on a corresponding heat-dissipating surface region (340). High thermal stability and output power are obtained in some embodiments even if the modules are combined to obtain higher-level modules (310-2). Other features and embodiments are also provided.

This invention relates to automatic test field and to emulsion liquid concentration automatic testing system and its method, which comprises sensor, A/D conversion unit, CPU unit, and single machine and display unit. The invention is characterize by the following: the sensor comprises one 850nm infrared laser diode tube, scattering and transparent mode tester and electric meter; the sensor converts the concentration signals into relative analogue voltage signals to convert voltage signal into digital signals through A/D conversion unit to send the digital signals into single machine memory unit for data processing and displaying the results.

The invention discloses a novel microchip laser supporting optical fiber output, which belongs to the fields of laser technology and non-linear optics. The novel microchip laser mainly comprises a laser diode pumping source, an optical fiber output system, an optical collimation system, a laser light gain medium and optical elements, wherein pump light enters the optical collimation system for collimating after passing through the optical fiber output system, and is focused onto the gain medium; the film-plated optical elements are arranged in front of and behind the gain medium; the gain medium and the film-plated optical elements in front of and behind the gain medium construct a laser resonant cavity with a sandwich structure; laser light generated by the laser resonant cavity returns along the incident direction of the pump light, passes through the optical collimation system once again, and is output through the optical fiber output system. The novel microchip laser has the characteristics that optical fiber output is performed during the use of an optical fiber pump without any additional output device in a sandwich microchip structure, and a fiber-core pump or a cladding pump can be adopted, so that the flexibility of a system is improved greatly; and meanwhile, the structure can also be applied to pulse modulation of materials such as semiconductor saturable absorbing mirrors, single-wall carbon nanotubes or graphene and the like, and stable pulse output is realized.

The invention discloses a positioning device for electrocardio-electrode placement positioning. The positioning device comprises a body applied in a spot projection method, a transverse zooming lens, a longitudinal zooming lens and a regulation device, wherein the body comprises a spot projection device which comprises a light source power supply and a light source panel; a plurality of laser diodes are arranged on the light source panel; and relative positions among the laser diodes are in accordance with reference positions of a breastbone superior margin marker, a breastbone inferior margin marker, a left midaxilla marker and a colpus measurement electrode.

The invention discloses a circuit for reducing the power consumption of a TOSA. The circuit comprises a DC-DC power module. The feedback end of the DC-DC power module is connected with the ground through a third resistor and connected with a microcontroller through a second resistor. A first resistor is connected between the output end of the DC-DC power module and the second resistor in series. The output end of the DC-DC power module is connected with a collector of a triode. A base electrode of the triode is connected with an APC circuit, and an emitting electrode of the triode is connected with a laser diode of the TOSA through a fourth resistor. The microcontroller is connected with the two ends of the fourth resistor in parallel and used for monitoring the difference of the voltage across the two ends of the fourth resistor, and the output voltage of the DC-DC power module is gradually reduced according to the difference of the voltage. According to the circuit for reducing the power consumption of the TOSA, due to the fact that the output voltage of the DC-DC direct-current power module is gradually reduced, under the condition that the TOSA works stably, the power consumption of the TOSA is effectively reduced.

A laser diode device includes a red laser diode element, a green laser diode element and a blue laser diode element. The red, green and blue laser diode elements are arranged in a single package in a state of being connected to wires for supplying power independently. Additionally, the blue laser diode element is arranged between the red laser diode element and the green laser diode element as viewed from a laser beam-emitting direction.

The invention discloses an all-solid-state laser capable of obtaining single-frequency output at a wavelength of 558nm. The all-solid-state laser comprises a pumping source system and a Z type resonator device, wherein the pumping source system comprises a laser diode LD, an optical fiber and a focusing coupling lens system which are arranged on an optical path in sequence; the Z type resonator device comprises a rear mirror, a concave folding mirror, a yellow light output mirror and a total reflective mirror which are arranged in a Z type cavity in sequence; wave plates and a laser gain medium are arranged between the rear mirror and the concave folding mirror; a birefringent filter is arranged between the concave folding mirror and the yellow light output mirror; and a frequency doubling crystal is arranged between the yellow light output mirror and the total reflective mirror. According to the all-solid-state laser, the high power density of fundamental light in the cavity is fully utilized and the frequency doubling efficiency is improved by adopting the Z type cavity, so that the yellow light laser output at single longitudinal mode, low noise, high power and high energy is realized, and the defects of the laser in the prior art are successfully solved.

The invention belongs to the technical field of optics, and particularly relates to a grating external cavity feedback semiconductor laser and an adjusting method thereof. The grating external cavityfeedback semiconductor laser comprises a housing, a substrate, a grating frame, a laser diode, a plane mirror, a pressing plate, a backing ring, a feedback grating, piezoelectric ceramics, a Peltier and a gasket. The plane mirror, the pressing plate, the backing ring, the feedback grating and the piezoelectric ceramics are mounted on the grating frame; the grating frame is fixed in the substrate;and the substrate is fixed on the pedestal of the housing. According to invention, the structure that a laser diode, a feedback grating and a plane mirror in the prior art are arranged separately andindependently is integrated into a whole structure, so that the semiconductor laser has a wider tuning range, the adjustment of the semiconductor laser is simpler and more convenient, and a scheme isprovided for batch production.