A fiber laser oscillator comprises an active fiber for providing a lasing light having a selected wavelength band, a saturable absorber assembly coupled to a first end of the active fiber, a pump source for providing a pump light having wavelengths except the selected wavelength band, an optical component coupled to the second end of the active fiber and the pump source. The optical component comprises a thin film filter for transmitting the lasing light for a first time and reflecting the pump light and a reflector for reflecting the lasing light transmitted for the first time through the thin film filter. The lasing light reflected by the reflector transmits through the thin film filter for a second time and overlaps with the pump light reflected by the thin film filter.

An electro-optic (EO) sensor and a method for detecting a local electric field strength, the EO sensor including: a first optical cavity; a gain medium within the first optical cavity; a mode locking element within the first optical cavity; and an EO material within the first optical cavity, an effective optical path length of the EO material being variable depending on the local electric field strength at the EO sensor, wherein the gain medium, the mode locking element, and the EO material are arranged in a common path of light within the first optical cavity, and wherein during operation, the EO sensor emits pulses of light at a repetition rate characteristic of an effective optical path length of the light within the first optical cavity, the effective optical path length varying depending on the electric field strength local to the EO sensor.

A laser system, comprised of: a laser cavity; a gain medium a pump, a saturable absorber (SA); a first mirror and a second mirror; wherein a ratio of an area of the laser beam within the gain medium to an area of the beam area within the SA is greater than 1, and wherein the beam generates a gain medium radius spot on the gain medium and a saturable absorber radius spot on the saturable absorber such that a ratio between the gain medium radius spot on the gain medium and a saturable absorber radius spot on the saturable absorber is within a range of 1.7-7 is disclosed. A method for using the laser system e.g., for producing a pulsed energy is further disclosed.

A high-power ytterbium-doped calcium fluoride laser system is disclosed herein which includes at least one pump source, at least one laser cavity formed by at least one high reflector and at least one output coupler, and at least one ytterbium-doped calcium fluoride optical crystal positioned within the laser cavity in communication with the pump source, the ytterbium-doped calcium fluoride optical crystal configured to output at least one output signal of at least 20 W, having a pulse width of 200 fs or less, and a repetition rate of at least 40 MHz.

A short-pulse laser system includes a first and a second resonator, and an amplification means for amplifying the electromagnetic pulses both in the first and in the second resonator. The first resonator supports precisely one first linear polarization state, and the second resonator supports precisely one second linear polarization state perpendicular to the first polarization state. The short-pulse laser system has first and second birefringent material sections. The first birefringent material section and/or the second birefringent material section is designed in such a way that a difference between the sum of the optical path length of the first resonator in the first birefringent material section and the optical path length of the first resonator in the second birefringent material section and the sum of the optical path length of the second resonator in the first birefringent material section and the optical path length of the second resonator in the second birefringent material section can be changed in an adjustable manner.

An apparatus for emitting pulsed electromagnetic laser radiation includes a laser gain element; an optical arrangement defining a laser resonator and arranged to re-direct radiation emitted by the gain element along a beam path back onto the gain element, the optical arrangement comprising an output coupler configured to couple a portion of the radiation in the laser resonator out of the laser resonator; and, a pump arrangement configured to pump the laser gain element. The optical arrangement includes a mode locker placed in the laser resonator in the beam path, and a birefringent element placed in the laser resonator in the beam path.

An optical plural-comb generator comprising a plurality of mode-locked lasers that are mechanically coupled and optically independent. The optical plural-comb generator comprises an optical combiner optically coupled to an output of each of the plurality of mode-locked lasers for combining a plurality of optical combs when generated by the plurality of mode-locked lasers.

The present disclosure discloses a saturable absorber mirror of a composite structure, including: a substrate; a buffer layer on the substrate; a distributed Bragg reflective mirror on the buffer layer; a quantum dot or quantum well saturable absorber body on the distributed Bragg reflective mirror; a graphene saturable absorber body on the quantum dot or quantum well saturable absorber body. In the present disclosure, the graphene saturable absorber body is composited with the quantum dot saturable absorber body or the quantum well saturable absorber body to be used as the saturable absorber body in the saturable absorber mirror of the present disclosure. A thermal damage threshold and an optical property stability of the saturable absorber body are improved, and an ultrafast laser pulse with high power and short pulse mode locking, a stable output repetition cycle, a narrow pulse width, and a short response time is implemented.

The present disclosure discloses a saturable absorber mirror of a composite structure, including: a substrate; a buffer layer on the substrate; a distributed Bragg reflective mirror on the buffer layer; a quantum dot or quantum well saturable absorber body on the distributed Bragg reflective mirror; a graphene saturable absorber body on the quantum dot or quantum well saturable absorber body. In the present disclosure, the graphene saturable absorber body is composited with the quantum dot saturable absorber body or the quantum well saturable absorber body to be used as the saturable absorber body in the saturable absorber mirror of the present disclosure. A thermal damage threshold and an optical property stability of the saturable absorber body are improved, and an ultrafast laser pulse with high power and short pulse mode locking, a stable output repetition cycle, a narrow pulse width, and a short response time is implemented.

An optical pulse generation device includes an optical resonator of mode-locked type, a light source, and a waveform controller. The optical resonator includes an optical amplification medium and generates, amplifies, and outputs laser light. The light source is optically coupled to the optical resonator and supplies excitation light to the optical amplification medium. The waveform controller is arranged in the optical resonator, and controls a time waveform of the laser light within a predetermined period to convert the laser light into an optical pulse train including two or more optical pulses within a period of the optical resonator. The optical resonator amplifies the optical pulse train after the predetermined period and outputs the optical pulse train having amplified as the laser light.