Abstract: An all-fiber Q-switched laser including a laser resonant cavity and a loop optical system is provided. The loop optical system is disposed inside the laser resonant cavity, and the all-fiber Q-switched laser generates a pulsed laser through the loop optical system. The loop optical system includes a plurality of wavelength-division elements and a saturable absorber. One of the wavelength-division elements is coupled with another one of the wavelength-division elements through corresponding first connecting fibers. Two ends of the saturable absorber are respectively coupled to second connecting fibers of the wavelength-division elements, wherein the saturable absorber and the two wavelength-division elements form a loop such that an auxiliary unsaturated light source can be transmitted in the loop.

Abstract: A system and a method for driving light emitters of a liquid crystal display (LCD) backlight module is disclosed. The system drives the light emitters by supplying a constant current and a pulse width modulated current to an individual light emitter, the pulse width modulated current being determined in accordance with an optical output of the light emitter. Accordingly, the system can provide a desired amount of current to the light emitters, and individually control the optical output of the light emitters.

Abstract: A laser apparatus with all optical-fiber includes a plurality of pumping light sources in different wave bands and an optical-fiber laser system. The optical-fiber laser system includes an optical fiber at least doped with erbium (Er) element and doped with or not doped with ytterbium (Yb) element according to a need. The optical-fiber laser system outputs a laser light through the pumping light source.

Abstract: A laser apparatus with all optical-fiber includes a plurality of pumping light sources in different wave bands and an optical-fiber laser system. The optical-fiber laser system includes an optical fiber at least doped with erbium (Er) element and doped with or not doped with ytterbium (Yb) element according to a need. The optical-fiber laser system outputs a laser light through the pumping light source.

Abstract: A laser surgical apparatus is provided. The laser surgical apparatus includes a laser generator, a laser delivery module for delivering a laser beam to biological tissues, a fluid source, a fluid delivery module for delivering a fluid to the biological tissues, and a control module for controlling all the above units.

Abstract: An apparatus and a method are proposed for measuring displacement, surface profile and roughness of a moving object or an inner radius of a hollow cylinder. The apparatus includes a light emitting unit, a light dispersing unit for receiving light from the light emitting unit and focusing rays with different wavelengths into different focal points with different intervals, and a wavelength measuring unit for measuring wavelengths of the rays. When the moving object is moving within a dispersing range of the focal points, the rays with different wavelengths are reflected or scattered, and the displacement of the moving object is learned from variation of the wavelengths being measured by the wavelength measuring unit. Given that a reflecting component is disposed in the centre of an inner circle of the hollow cylinder, the inner radius of the hollow cylinder can be measured by the principle of the apparatus for measuring displacement.

Abstract: The system for stabilizing wavelength of LED (light emitting diode) radiation in backlight module of the LCD (liquid crystal display) comprises two photodiodes, a plurality of LEDs, a microprocessor unit (MCU) and a driver circuit, wherein two photodiodes have different photo sensitivities in response different wavelengths. A target value, associated with a ration of photo sensitivities of the two photodiodes under two different wavelength radiations, is stored to the MCU as a referred value. Thus, another wavelength (or wavelength variation) of LED radiation is derived by comparing another target value with the referred value. The MCU determines a correction constant based on a color match function of the derived wavelength, and outputs a compensation signal to compensate LED, wherein the compensation signal is equal to multiplication of the correction constant and an original light intensity compensation signal for compensating light intensity loss of the LED.

Abstract: A fiber side-coupling apparatus can be spliced with active fiber as a fiber-based side-coupler in series at both sides for distributively-pumped monolithic fiber lasers. This side-coupling apparatus includes a large-mode-area double-clad passive optical fiber. A cladding grating, formed on the cladding surface of the passive fiber, comprises a plurality of grating members and a reflection layer formed thereon. A laser diode bar array is disposed on one side of the optical fiber opposite the cladding grating. A collimation device, placed between the optical fiber and the laser diode bar array, is used to collect the pump beam to the cladding grating as much as possible in fast axis and collimate the pump beam to be incident to the cladding grating in slow axis as normally as possible. The collimated pump beams emitted from a laser diode bar array are normally incident to the cladding grating within the alignment tolerance of ±2 to ±4 degrees.

Abstract: A high power LED has at least a porous material layer, a thermal conductive layer and a chip. The thermal conductive layer is disposed on the surface of the porous material layer and the chip is disposed on the thermal conductive layer. Heat generated by the chip is conducted from the thermal conductive layer to the porous material layer, and convected outside via the porous material layer. Thereby, surface area in contact with the air is increased and high thermal conductivity and high heat convection are also achieved.

Abstract: An apparatus and a method are proposed for measuring displacement, surface profile and roughness of a moving object or an inner radius of a hollow cylinder. The apparatus includes a light emitting unit, a light dispersing unit for receiving light from the light emitting unit and focusing rays with different wavelengths into different focal points with different intervals, and a wavelength measuring unit for measuring wavelengths of the rays. When the moving object is moving within a dispersing range of the focal points, the rays with different wavelengths are reflected or scattered, and the displacement of the moving object is learned from variation of the wavelengths being measured by the wavelength measuring unit. Given that a reflecting component is disposed in the centre of an inner circle of the hollow cylinder, the inner radius of the hollow cylinder can be measured by the principle of the apparatus for measuring displacement.

Abstract: The system for stabilizing wavelength of LED (light emitting diode) radiation in backlight module of the LCD (liquid crystal display) comprises two photodiodes, a plurality of LEDs, a microprocessor unit (MCU) and a driver circuit, wherein two photodiodes have different photo sensitivities in response different wavelengths. A target value, associated with a ration of photo sensitivities of the two photodiodes under two different wavelength radiations, is stored to the MCU as a referred value. Thus, another wavelength (or wavelength variation) of LED radiation is derived by comparing another target value with the referred value. The MCU determines a correction constant based on a colour match function of the derived wavelength, and outputs a compensation signal to compensate LED, wherein the compensation signal is equal to multiplication of the correction constant and an original light intensity compensation signal for compensating light intensity loss of the LED.

Abstract: An apparatus and a method are proposed for measuring displacement, surface profile and roughness of a moving object or an inner radius of a hollow cylinder. The apparatus includes a light emitting unit, a light dispersing unit for receiving light from the light emitting unit and focusing rays with different wavelengths into different focal points with different intervals, and a wavelength measuring unit for measuring wavelengths of the rays. When the moving object is moving within a dispersing range of the focal points, the rays with different wavelengths are reflected or scattered, and the displacement of the moving object is learned from variation of the wavelengths being measured by the wavelength measuring unit. Given that a reflecting component is disposed in the centre of an inner circle of the hollow cylinder, the inner radius of the hollow cylinder can be measured by the principle of the apparatus for measuring displacement.

Abstract: An apparatus as a tuning filter is provided for tuning the wavelength of a laser or a filter between extensive bandwidths, including a reflecting element, an optical system and a movable mount set up in the same optical path in order. The optical system focuses light on the reflecting element that induces dispersion effect. The reflecting element moves along an optical path as a spatial filter. The reflecting element is set up on the movable mount that moves along the optical path to push/pull the reflecting element and then to adjust the moving range of the reflecting element.

Abstract: A light-emitting diode (LED) driver is provided to drive an LED. The LED driver includes a clock supply to periodically output a modulation period. A brightness controller is provided to receive brightness data corresponding to the desired brightness of the LED. The brightness controller generates a pulse-width-modulated (PWM) duty pulse within the modulation period, a width of the PWM duty pulse being based on the brightness data. The LED driver also includes a detection controller to receive detection data indicating whether the LED is to be detected during the modulation period. When the detection data indicate that the LED is to be detected during the modulation period, the detection controller generates a detection pulse within the modulation period. A driver output is provided to output the PWM duty pulse and the detection pulse to the LED within the modulation period.

Abstract: A method and a system for achieving a desired operation illumination condition for a plurality of light emitters are provided. The light emitters are divided into mutually distinctive groups. The groups of light emitters are sequentially activated while maintaining the rest of groups of the light emitters in an inactivated state. In this manner, the illumination condition of each group of light emitters are detected, so as to adjust a driving condition for the light emitters, thereby producing a light source with uniformly distributed white light spectra, and a homogeneous intensity distribution over the entire region of the light source.

Abstract: A system and a method for driving light emitters of a liquid crystal display (LCD) backlight module is disclosed. The system drives the light emitters by supplying a constant current and a pulse width modulated current to an individual light emitter, the pulse width modulated current being determined in accordance with an optical output of the light emitter. Accordingly, the system can provide a desired amount of current to the light emitters, and individually control the optical output of the light emitters.

Abstract: An apparatus and a method are proposed for measuring displacement, surface profile and roughness of a moving object or an inner radius of a hollow cylinder. The apparatus includes a light emitting unit, a light dispersing unit for receiving light from the light emitting unit and focusing rays with different wavelengths into different focal points with different intervals, and a wavelength measuring unit for measuring wavelengths of the rays. When the moving object is moving within a dispersing range of the focal points, the rays with different wavelengths are reflected or scattered, and the displacement of the moving object is learned from variation of the wavelengths being measured by the wavelength measuring unit. Given that a reflecting component is disposed in the centre of an inner circle of the hollow cylinder, the inner radius of the hollow cylinder can be measured by the principle of the apparatus for measuring displacement.

Abstract: A high power LED has at least a porous material layer, a thermal conductive layer and a chip. The thermal conductive layer is disposed on the surface of the porous material layer and the chip is disposed on the thermal conductive layer. Heat generated by the chip is conducted from the thermal conductive layer to the porous material layer, and convected outside via the porous material layer. Thereby, surface area in contact with the air is increased and high thermal conductivity and high heat convection are also achieved.

Abstract: An apparatus as a tuning filter is provided for tuning the wavelength of a laser or a filter between extensive bandwidths, including a reflecting element, an optical system and a movable mount set up in the same optical path in order. The optical system focuses light on the reflecting element that induces dispersion effect. The reflecting element moves along an optical path as a spatial filter. The reflecting element is set up on the movable mount that moves along the optical path to push/pull the reflecting element and then to adjust the moving range of the reflecting element.

Abstract: A wavelength meter is combined with optical elements to measure the wavelength in order to change communication channels by adjusting the wavelength. The wavelength meter has two wavelength-dependent interferometers with a lower sensitivity on large wavelength ranges and a higher sensitivity on small wavelength ranges, respectively. Each interferometer provides an output signal having an intensity that varies with wavelength. Using the interferometer with a lower sensitivity on large wavelength ranges to first determine a rough range of the wavelength of an incident optical signal, it then uses the interferometer with a higher sensitivity on small wavelength ranges to measure the accurate wavelength of the incident optical beam.