A laser oscillation amplifier includes a seed laser that can produce an input laser beam, a pumping source that can produce a pump light, a semiconductor laser shaping device that can receive the pump light and to produce a shaped pump light, a beam combiner that can combine the shaped pump light and the input laser beam, and a gain fiber coupled with the beam combiner. The gain fiber can absorb the pump light and amplifying the input laser beam to produce an output laser beam.

The invention relates to a quantum cascade laser emitting a TM polarized optical mode with a wavelength between 3 and 15 m, including a gain medium and a main waveguide. The latter includes a coupling section in contact with the gain medium, comprising a DFB diffraction grating. The coupling section has a width greater than or equal to a minimum width from which an antisymmetric supermode propagating in a laser guiding structure comprising the gain medium and the main waveguide, has a confinement factor in an active region of the gain medium strictly greater than those of the optical modes likely to be guided by the guiding structure. The main waveguide includes a core based on atoms from column IV A of the periodic table of elements and a SiN or chalcogenide confinement sublayer.

A deterrent apparatus, method and system including a laser configured to operate between 1000 nm and 2100 nm, a controller, and a detector. The controller is configured to instruct the laser to apply Q-switch pulses of laser to act as a deterrent to a subject. The laser may be a Thulium Fiber Laser, configured to operate between 1800 nm and 2100 nm. The laser may be a YAG Laser, configured to operate between 1000 nm and 2000 nm.

An ultraviolet laser apparatus includes: a semiconductor laser that emits an excitation laser light; a fiber laser medium to which the excitation laser light enters from the semiconductor laser and that causes laser oscillation; and an external resonator that: converts a wavelength of a laser light oscillated in the fiber laser medium, and outputs an ultraviolet region continuous wave of at least 0.1W.

The present invention provides a blue laser transmitter operating at the H-beta Fraunhofer line at 486.13 nm wavelength. The subject blue laser is based on pulsed lasing action in thulium doped into lutetium sesquioxide (Tm:Lu.sub.2O.sub.3). The laser wavelength is restricted by volume Bragg grating to the vicinity of 1944 nm wavelength. The laser is operated with a q-switch to generate high-energy pulses within the nanosecond regime. The output at the 1944 nm wavelength is then frequency quadrupled in a single pass through non-linear crystals to a wavelength near the center of the H-beta Fraunhofer line. The operation at the 1944 nm wavelength in Tm:Lu.sub.2O.sub.3 is very efficient because this wavelength is located on a shoulder of a substantially broad emission peak at 1945 nm. In addition, at the 1944 nm wavelength, Tm:Lu.sub.2O.sub.3 has only a modest saturation fluence of about 15 J/cm.sup.2, which allows for efficient energy extraction.

Proposed are an apparatus and a method for emitting multi-wavelength lasers. The apparatus for emitting multi-wavelength lasers includes a main body configured to perform overall control and operation, a handpiece which is operated by the control of the main body and is connected to the main body by wire, and a tip capable of being coupled to one side of the handpiece, wherein the main body includes a first power supply part, a display part, a control part, a laser generation part, a temperature control part, and a cooling part, wherein the laser generation part includes a first laser generator and a second laser generator which output lasers of different wavelengths, respectively, and the temperature control part includes a first temperature control part which controls a temperature of the first laser generator, and a second temperature control part which controls a temperature of the second laser generator.

A method and apparatus for inscribing a high-temperature stable Bragg grating in an optical waveguide, comprising the steps of: providing the optical waveguide; providing electromagnetic radiation from an ultrashort pulse duration laser, wherein the wavelength of the electromagnetic radiation has a characteristic wavelength in the wavelength range from 150 nanometers (nm) to 2.0 micrometers (m); providing cylindrical focusing optics; providing a diffractive optical element that when exposed to the focused ultrashort laser pulse, creates an interference pattern on the optical waveguide, wherein the irradiation step comprises irradiating a surface of the diffractive optical element with the focused electromagnetic radiation, the electromagnetic radiation incident on the optical waveguide, from the diffractive optical element, being sufficiently intensive to cause permanent (Type II) change in the index of refraction within multiple Bragg grating planes in the core of the optical waveguide resulting from at least one micropore.

Disclosed is a heater/dryer that includes an array of one or more vertical cavity surface emitting lasers (VCSELs) disposed on a substrate. A lens assembly or array including at least one lens per VCSEL is disposed on the array of VCSELs opposite the substrate, wherein each lens is spherical or aspherical, with a convex side of the lens facing away from the array of VCSELs. The substrate may be a ceramic substrate. A side of the substrate opposite the one or more VCSELs may be coupled to an underlying substrate which may be a metal core printed circuit board (MCPCB) and/or a water cooled chiller plate. Also disclosed is a method of using the heater/dryer.