| Patent application number | Description | Published |
|---|
| 20080279234 | Alignment of lasing wavelength with wavelength conversion peak using modulated wavelength control signal - According to one embodiment of the present invention, a programmable light source comprises one or more semiconductor lasers, a wavelength conversion device, and a laser controller. The controller is programmed to operate the semiconductor laser using a modulated feedback control signal. The wavelength control signal is adjusted based on the results of a comparison of a detected intensity signal with a feedback signal to align the lasing wavelength with the conversion efficiency peak of the wavelength conversion device. Laser controllers and projections systems operating according to the control concepts of the present invention are also provided. | 11-13-2008 |
| 20090022188 | Frequency modulation in the optical alignment of wavelength-converted laser sources - Methods of controlling semiconductor lasers are provided where the semiconductor laser generates a wavelength-modulated output beam λ | 01-22-2009 |
| 20090168818 | Systems and methods for polarization modulation of an optical signal - According to one embodiment of the present invention, a method of operating a laser source is provided. The laser source comprises a laser configured to generate an optical signal, and a polarization split and delay unit that is coupled to the optical signal. The polarization split and delay unit is configured to split the optical signal into a first and second orthogonally polarized component, create an optical path difference ΔL between the first and second orthogonally polarized components and combine the first and second orthogonally polarized components into a combined signal. The method comprises modulating the optical signal by applying a wavelength modulation signal to the laser such that the modulated optical signal comprises at least a first wavelength λ | 07-02-2009 |
| 20090252187 | Minimizing Power Variations In Laser Sources - The present invention relates generally to semiconductor lasers and laser projection systems. According to one embodiment of the present invention, a projected laser image is generated utilizing an output beam of the semiconductor laser. A gain current control signal is generated by a laser feedback loop to control the gain section of the semiconductor laser. Wavelength fluctuations of the semiconductor laser are narrowed by incorporating a wavelength recovery operation in a drive current of the semiconductor laser and by initiating the wavelength recovery operations as a function of the gain current control signal or an optical intensity error signal. Additional embodiments are disclosed and claimed. | 10-08-2009 |
| 20100002736 | Wavelength normalization in phase section of semiconductor lasers - Particular embodiments of the present invention relate generally to semiconductor lasers and laser projections systems and, more particularly, to schemes for controlling semiconductor lasers. According to one embodiment of the present invention, a laser having a gain section, a phase section and a wavelength selective section is configured for optical emission of encoded data. The optical emission is shifted across a plurality of laser cavity modes by applying a quasi-periodic phase shifting signal I/V | 01-07-2010 |
| 20100098116 | Optimized signal control in frequency-doubled laser sources - The present disclosure relates generally to semiconductor lasers and laser projection systems. According to one embodiment of the present disclosure, a method of operating a laser projection system is provided. According to the method, the laser projection system is utilized to display a sequence of pixelized image frames comprising an alternating sequence of relatively high intensity active projection periods Mod | 04-22-2010 |
| 20100103967 | CORRECTION OF POWER VARIATIONS IN LASER SOURCES - The present invention relates generally to semiconductor lasers and laser projection systems. According to one embodiment of the present invention, a method of correcting output power variations in a semiconductor laser is provided. According to the method, an output power feedback loop is utilized to generate optical intensity feedback signals representing actual output power of the laser source for discrete portions V | 04-29-2010 |
| 20100150185 | MULTI-VARIABLE CONTROL METHODS FOR OPTICAL PACKAGES - According to one embodiment of the present invention, an optical package comprises one or more semiconductor lasers coupled to a wavelength conversion device with adaptive optics. The optical package also comprises a package controller programmed to operate the semiconductor laser and the adaptive optics based on modulated feedback control signals supplied to the wavelength selective section of the semiconductor laser and the adaptive optics. The wavelength control signal supplied to the wavelength selective section of the semiconductor laser may be adjusted based on the modulated wavelength feedback control signal such that the response parameter of the wavelength conversion device is optimized. Similarly, the position control signals supplied to the adaptive optics may be adjusted based on the modulated feedback position control signals such that the response parameter of the wavelength conversion device is optimized. | 06-17-2010 |
| 20100166028 | LASER APPARATUS AND OUTPUT CONTROL METHOD OF LASER APPARATUS - A laser apparatus includes: a laser light source; an output member for receiving and transmitting a laser light flux generated by the laser light flux, and outputting a laser light flux; an optical aligning member for positioning the laser light flux generated by the laser light source to the output member; a drive for driving the optical aligning member; a drive controller; an output detector for outputting a detected output representing an intensity of a laser light flux outputted from the output member; and an output controller. The drive controller controls the drive to drive the optical aligning member and the output controller changes a power of the laser light flux generated by the light source, based on the detected output. | 07-01-2010 |
| 20100303107 | Methods for Obtaining Stabilized Output Beams from Frequency Converted Light Sources and Frequency Converted Light Sources Utilizing the Same - A method for operating a frequency converted light source includes sweeping a wavelength control signal of a semiconductor laser over an initial signal range and measuring an optical power of an output beam emitted from a wavelength conversion device coupled to the semiconductor laser. The wavelength control signal of the semiconductor laser may then be swept over at least one truncated signal range and the optical power of the resulting output beam is measured. The at least one truncated signal range may be centered on a point corresponding to a maximum power of the output beam of the sweep of the wavelength control signal over the preceding signal range. An operational signal range for the wavelength control signal is determined such that a midpoint of the operational signal range corresponds to the maximum optical power of the resulting output beam of the sweep over the preceding signal range. Closed-loop feedback control of the wavelength control signal in the operational signal range may then be initiated. | 12-02-2010 |
| 20100322272 | Minimizing power variations in laser sources - The present invention relates generally to semiconductor lasers and laser projection systems. According to one embodiment of the present invention, a projected laser image is generated utilizing an output beam of the semiconductor laser. A gain current control signal is generated by a gain current feedback loop to control the gain section of the semiconductor laser. Wavelength fluctuations of the semiconductor laser are narrowed by incorporating a wavelength recovery operation in a drive current of the semiconductor laser and by initiating the wavelength recovery operations as a function of the gain current control signal or an optical intensity error signal. Additional embodiments are disclosed and claimed. | 12-23-2010 |
