Provided is a laser device capable of realizing the increased output and increased repeatability even when the surface roughness of the gain medium is large. The laser device includes: an excitation light source; a condensing optical system that condenses excitation light outputted from the excitation light source; a gain medium that receives the excitation light condensed by the condensing optical system and outputs emission light; a transparent member that has a smaller surface roughness than the gain medium and transmits the emission light outputted from the gain medium; a supersaturated absorber having a transmittance that increases as the emission light transmitted through the transparent member is absorbed; and a resonator that causes the emission light to resonate between the gain medium and the supersaturated absorber with the transparent member being interposed therebetween, wherein a dielectric multilayer film that reflects the excitation light and transmits the emission light is coated on the surface of the transparent member on the gain medium side.

There is provided a passive Q-switch pulse laser device including a laser medium, and a saturable absorber. The laser medium is disposed between a pair of reflection means included in an optical resonator. The laser medium is excited by specific excitation light to emit emission light. The saturable absorber is disposed on an optical axis of the optical resonator and on a downstream side of the laser medium between the pair of reflection means. The saturable absorber has a transmittance increased by absorption of the emission light. At least one of the pair of reflection means is a polarizing element. The polarizing element has different reflectances with respect to the respective pieces of emission light in polarization directions orthogonal to each other.

A laser system, comprising: a laser cavity, a gain medium positioned within the laser cavity, a pump source optically coupled to the gain medium, an input minor positioned at a first end of the laser cavity, an output coupler positioned at a second end of the laser cavity, a first etalon positioned within the laser cavity, and a q-switching element positioned within the laser cavity, wherein the laser system is configured to provide a laser beam at a selected wavelength ranging of 1700 to 3000 nm with a tunable spectral range of at least 10 nm. A method for using the laser system e.g., for producing a pulsed laser beam is further disclosed.

A laser system, comprising: a laser cavity, a gain medium positioned within the laser cavity, a pump source optically coupled to the gain medium, an input minor positioned at a first end of the laser cavity, an output coupler positioned at a second end of the laser cavity, a first etalon positioned within the laser cavity, and a q-switching element positioned within the laser cavity, wherein the laser system is configured to provide a laser beam at a selected wavelength ranging of 1700 to 3000 nm with a tunable spectral range of at least 10 nm. A method for using the laser system e.g., for producing a pulsed laser beam is further disclosed.

The invention relates to the field of laser technology and is intended for the provision of stable generation of ultrashort laser pulses. The proposed method and device are implemented in a unidirectional polarizing resonator, at a given level of optical amplification in the active fiber section of an amplifier. The resonator contains a non-linear optical element having two loops with passive thermal compensation by means of special placing together of the asymmetric sections of birefringent fiber. Both loops are thermostatically controlled. The selection and fixing of the temperatures of these two loops, at a given level of optical amplification in the optical amplifier, further ensures the optimal ratio of the linear and non-linear parts of the phase difference between the polarization components of the optical wave at the NOE output, by which there is stable ultrashort pulsing autogeneration with self-excitation at start up each time the laser is switched on.

The invention relates to the field of laser technology and is intended for the provision of stable generation of ultrashort laser pulses. The proposed method and device are implemented in a unidirectional polarizing resonator, at a given level of optical amplification in the active fiber section of an amplifier. The resonator contains a non-linear optical element having two loops with passive thermal compensation by means of special placing together of the asymmetric sections of birefringent fiber. Both loops are thermostatically controlled. The selection and fixing of the temperatures of these two loops, at a given level of optical amplification in the optical amplifier, further ensures the optimal ratio of the linear and non-linear parts of the phase difference between the polarization components of the optical wave at the NOE output, by which there is stable ultrashort pulsing autogeneration with self-excitation at start up each time the laser is switched on.

An electrodeless laser-driven light source includes a laser source that generates CW sustaining light. A pump laser generates pump light. A Q-switched laser crystal is positioned to receive the pump light and generates pulsed laser light in response to the generated pump light that propagates to a breakdown region in a gas filled bulb comprising an ionizing gas. A detector detects plasma light generated by a CW plasma located at least partly in a CW plasma region in the gas filled bulb comprising the ionizing gas and generates a detection signal. A controller generates control signals that control the pump light to the Q-switched laser crystal so as to extinguish the pulsed laser light within a time delay after the detection signal exceeds a threshold level.

An electrodeless laser-driven light source includes a laser source that generates CW sustaining light. A pump laser generates pump light. A Q-switched laser crystal is positioned to receive the pump light and generates pulsed laser light in response to the generated pump light that propagates to a breakdown region in a gas filled bulb comprising an ionizing gas. A detector detects plasma light generated by a CW plasma located at least partly in a CW plasma region in the gas filled bulb comprising the ionizing gas and generates a detection signal. A controller generates control signals that control the pump light to the Q-switched laser crystal so as to extinguish the pulsed laser light within a time delay after the detection signal exceeds a threshold level.

A femtosecond pulse laser apparatus includes a pump light source configured to provide a pump light, a gain medium configured to obtain a gain of a laser light using the pump light, a first curved mirror and a second curved mirror, which are provided at both sides of the gain medium, an output mirror configured to transmit a portion of the laser light and reflect the other portion of the laser light to the gain medium, a mode locking portion configured to generate a femtosecond pulse of the laser light, and an acoustic wave generator configured to provide an acoustic wave into the gain medium so as to adjust self-phase modulation of the laser light.

A femtosecond pulse laser apparatus includes a pump light source configured to provide a pump light, a gain medium configured to obtain a gain of a laser light using the pump light, a first curved mirror and a second curved mirror, which are provided at both sides of the gain medium, an output mirror configured to transmit a portion of the laser light and reflect the other portion of the laser light to the gain medium, a mode locking portion configured to generate a femtosecond pulse of the laser light, and an acoustic wave generator configured to provide an acoustic wave into the gain medium so as to adjust self-phase modulation of the laser light.