Carl-zeiss-stiftung

Boreal Laser Inc.

Canadian Patents & Dev. Limited

Dickey, Dwayne J.

Tulip, John

Moore, Ronald D.

John Tulip

Herb J Seguin

Kyong H Nam

Dwayne J Dickey

Ronald D Moore

A method of suppressing retroreflector fringe noise in TDL spectrometers (TDLS) that use a laser and retroreflector. The path between the laser and each retroreflector element is changed mechanically for example by using a movable support for the retroreflector. The phase of light reaching the retroreflectors is very sensitive to the pathlength. A pathlength change of a fraction of the light wavelength will significantly change the phase of the light. In this method the pathlength to each retroreflector is modulated by mechanical means and this modulation is both stronger and faster than atmospheric effects on phase. If mechanical modulation occurs at a sufficiently high frequency retroreflector fringe noise can be averaged by integration of the spectrometer output over a reading period of typically one second.

Laser gas analyzer

A thermal stabilization system for a packaged diode laser. An outer thermoelectric cooler (TEC) stabilizes the temperature of the laser package and an inner TEC stabilizes the temperature of the laser diode element of the packaged laser. The inner and outer TECs may be controlled by electronics which is also stabilized in temperature, for example using resistive heating. The packaged laser may be mounted on a heat spreader mounted on the outer TEC and may be surrounded by an insulated covering on all sides other than the surface mounted on the heat spreader. There may also be a thermally conductive cap over the packaged laser, with the insulation arranged outside the cap if both are present.

Packaged laser thermal control system

A neodymium laser provides output at about 1.44 .mu.m, by selection of a neodymium doping level of between about 0.3 and 0.7N, preferably at 0.4N with reflectivity of the output mirror at about 90% for 1.44 .mu.m output. Selection of the reflectivity of the output mirror is adjusted to ensure that the excess of the gain over the absorption and transmission losses is maximized.

Long wavelength NdYAG laser

A long wavelength NdYAG laser which is operable either in a surgical cutting mode where the wavelength of laser radiation is about 1.44 micrometers, or in a therapeutic coagulating mode where the wavelength of laser radiation is about 1.06 micrometers. The NdYAG laser combines the use of frequency selective laser mirrors together with a repetitively pulsed high peak current lamp to produce high laser power at both 1.44 micrometers and 1.06 micrometers. The NdYAG laser beam may also be coupled to and transmitted by a flexible fiber optic quartz cable so that both the coagulating 1.06 micrometer beam and the cutting 1.44 micrometer beam may be transmitted through the same fiberoptic cable.

A cathode structure for gas lasers comprising a flat plate of non-conducting material positioned in the laser in spaced relation to the laser anode to define a discharge region therebetween, a two-dimensional array of metal sub-electrode rods passing through the plate and having their upper ends lying flush with the surface of the plate, a block of dielectric material positioned below the plate and containing a series of transverse channels therein, electric current conductors lying in the channels and adapted for connection to a power supply, the lower ends of the said rods passing through openings in the block into the channels to define a predetermined uniform gap between the ends of the rods and the electrical conductor, and a liquid electrolyte solution filling the channels and electrically connecting the sub-electrode rods and the conductors.

Growing community of inventors

Edmonton, Canada

John Tulip