A frequency electromagnetic radiation generation system including: a non linear crystal producing THz frequency electromagnetic radiation; a fundamental beam that interacts with the non linear crystal thereby emitting a THz frequency electromagnetic radiation emission; a silicon intermediary coupled to the non linear crystal for output channeling the THz frequency electromagnetic radiation emission to an output environment; the system utilising a fundamental beam which has a photon energy below the bandgap energy of silicon.

A laser assembly, including a first CW laser having a first fiber optic cable operationally connected thereto for directing a first CW laser output, a second QCW laser having a second fiber optic cable operationally connected thereto for directing a second QCW laser output, and a third Q-switched laser having a third fiber optic cable operationally connected thereto for directing a third Q-switched laser output. A fusion point is operationally connected to the first, second, and third fiber optic cables for combining the first, second, and third laser outputs into a composite output. A fourth fiber optic cable is connected to and extends from the fusion point for directing the composite output.

Described herein are light therapy devices for treating pain. The devices generally include a plurality of light sources configured to stimulate photobiomodulation in tissue, and may be equipped with a safety mechanism configured to stabilize power and current distribution. Methods for treating pain using the light therapy devices are also described herein.

A self-mixing interferometric, SMI, laser sensor comprises a vertical cavity surface emitting laser, VCSEL, configured to emit laser radiation, the VCSEL comprising a first distributed Bragg reflector, DBR, a second DBR and a cavity region including an active light generation region, wherein the cavity region is arranged in a layer structure between a front side of the first DBR and a back side of the second DBR. Therein at least one of the first and second DBR comprises a first contrast region and a second contrast region, the first contrast region having a first refractive index contrast n.sub.1 regarding an emission wavelength of the VCSEL and the second contrast region having a second refractive index contrast n.sub.2/n larger than the first refractive index contrast n.sub.1/n.

Disclosed are an ultrafast electric pulse generation and detection device and a use method thereof. The device includes a laser and an electric pulse generator. The electric pulse generator includes: a photoelectric material layer including an optically controlled switching region for responding to excitation light generated by the laser; an insulating layer formed on the photoelectric material layer, wherein a switch structure exists at a position of the insulating layer corresponding to the optically controlled switching region, so that the optically controlled switching region is partially exposed or completely exposed; transmission lines are formed on the insulating layer.

An optical fiber amplifier comprising a first optical fiber, a second optical fiber, a third optical fiber, and an excitation light source, is disclosed. Each optical fiber has cores and a cladding surrounding the cores. The third optical fiber transmits excitation light used for signal amplification in the second optical fiber. A rare-earth element is doped to the second optical fiber that amplifies an optical signal propagating therein by the excitation light. The third optical fiber includes a reduced-diameter portion. A distance between the cores of the third optical fiber in the reduced-diameter portion is shorter than a distance between the cores in other portion of the third optical fiber, and the excitation light entering from the excitation light source to one of the cores of the third optical fiber is mode-coupled with another core of the third optical fiber to distribute the excitation light in the reduced-diameter portion.

A single arm laser system comprising a first in-phase quadrature modulator, IQM. The first IQM is configured to receive a single frequency fibred laser beam from a frequency locked laser seed, generate a first single side-band frequency based on a carrier frequency of the single frequency fibred laser beam and suppress the carrier frequency, and output a first fibre laser beam having a single side-band suppressed carrier frequency. The single arm laser system also comprises a second IQM in line with the first IQM. The second IQM is configured to receive the first fibre laser beam from the first IQM, generate a second single side-band frequency based on the first single side-band frequency and maintain the first single side-band frequency as the carrier frequency, and output a second fibre laser beam having the first and second single side band frequencies.

A gas laser amplifier includes a housing, discharge electrode pairs, and an optical resonator. The housing includes an entrance window that allows entry of a first laser beam from outside and an exit window that allows exit of the first laser beam amplified. Each of the discharge electrode pairs excites a laser gas supplied between discharge electrodes facing each other in the housing. The optical resonator causes a second laser beam to oscillate with a gain of the excited laser gas in a non-incident state where the first laser beam from outside the housing does not enter the housing through the entrance window. In an incident state where the first laser beam enters the housing through the entrance window, the optical resonator suspends the oscillation of the second laser beam.

An ultraviolet laser device includes an oscillation stage laser outputting linearly polarized pulse laser light having an ultraviolet wavelength, an optical isolator arranged on an optical path between the oscillation stage laser and an amplifier, and a processor. The optical isolator includes a first polarizer, a first Faraday rotator rotating a polarization direction of the pulse laser light transmitted through the first polarizer in a first rotation direction, a second polarizer arranged so that the pulse laser light output from the first Faraday rotator is transmitted therethrough, a first actuator relatively moving the first magnet and the first Faraday material in an optical axis direction, and a first sensor measuring a power of pulse laser light reflected by the second polarizer among the pulse laser light output from the oscillation stage laser. The processor controls the first actuator based on a measurement result of the first sensor.

A high average and peak power single transverse mode laser system is operative to output ultrashort single mode (SM) pulses in femtosecond-, picosecond- or nanosecond-pulse duration range at a kW to MW peak power level. The disclosed system deploys master oscillator power amplifier configuration (MOPA) including a SM fiber seed, outputting a pulsed signal beam at or near 1030 nm wavelength, and a Yb crystal booster. The booster is end-pumped by a pump beam output from a SM or low-mode CW fiber laser at a pump wavelength in a 1000-1020 nm wavelength range so that the signal and pump wavelengths are selected to have an ultra-low-quantum defect of less than 3%.