摘要:
According to this disclosure a laser is suggested comprising: a resonator (4)having a first cavity (5) and a second cavity (6), an optically pumped gain element (2) arranged to generate fundamental electromagnetic radiation (17) at a fundamental frequency and located in the first cavity (5), and a periodically poled nonlinear optical crystal (3, 103, 123, 151, 152, 161) arranged to convert the fundamental electromagnetic radiation (17) into converted electromagnetic radiation (18, 126, 164) having a converted frequency and located in the second cavity (6), wherein the resonator (4)is resonant for the fundamental electromagnetic radiation (17), and wherein the first cavity (5) and the second cavity (6) are electromagnetically coupled.
摘要:
Grating mirror is provided, said grating mirror comprises a substrate having a first and a second surface on opposite sides thereof,a reflector arranged on the first surface of said substrate and comprising a stack of reflector layers with high refractive index layers and low refractive index layers stacked in alternating arrangement, a grating arranged on a side of said reflector opposite to said substrate,said grating comprising a stack of grating layers with at least one high refractive index grating layer and at least one low refractive index grating layer stacked in alternating arrangement, said stack of grating layers having grooves etched from a top surface into said stack of grating layers with an etching depth between 40nm or more and 300nm or less in order to obtain a waveguide grating structure.
摘要:
Embodiments comprise laser emitter devices that generate a collimated beam of light the intensity or amplitude of which may be varied so as to carry data signals at a high rate of efficiency, and that is less sensitive to alignment of the detector, and detector systems for detecting the same collimated beam and reading the data carried in the beam of light.
摘要:
A tunable lasing device including a vertical external cavity surface emitting laser, adapted to generate a fundamental laser beam in response to pumping from a pump source, said fundamental laser beam having a fundamental wavelength and a fundamental linewidth; a fundamental resonator cavity adapted to resonate the fundamental beam therein; a first optical element located within the fundamental resonator cavity for control of the fundamental linewidth of the fundamental beam; a Raman resonator located at least partially in said fundamental resonator adapted to receive the fundamental beam and comprising therein, a solid state Raman active medium located therein for generating at least a first Stokes beam from the fundamental beam wherein said Raman resonator cavity is adapted to resonate said Stokes beam therein and further adapted to emit an output beam; and further comprising a nonlinear medium located within the Raman resonator cavity for nonlinear frequency conversion of at least one of the beams present in the fundamental or the Raman resonator cavity; said tunable lasing device further comprising an output coupler adapted to emit an output beam, said output beam comprising at least a portion of said frequency converted beam being derived from at least one of the resonating beams in said fundamental or said Raman resonator cavities.
摘要:
An extra cavity harmonic generator system may produce a round, non-astigmatic third harmonic output beam from a nominally round, non-astigmatic, diffraction limited input fundamental beam. The system may include a second harmonic generation crystal. An input fundamental beam size is expanded in a non-walkoff direction for the SHG crystal at the SHG crystal input face. A higher harmonic generation crystal has an output face oriented at an oblique angle of incidence in a non-walkoff direction for the HHG crystal such that an output higher harmonic beam size is contracted in this direction. Expansion of the input fundamental beam at the SHG crystal input face exceeds reduction of third harmonic beam at the HHG crystal output face.
摘要:
High power lasers and high power laser systems that provide high power laser beams having preselected wavelengths and characteristics to optimize or enhance laser beam performance in predetermined environments, conditions and use requirements. In particular, lasers, methods and systems that relate to, among other things, Raman lasers, up conversion lasers, wavelength conversion laser systems, and multi-laser systems that are configured to match and create specific and predetermined wavelengths at specific points along an optical path having varying requirements along that path.
摘要:
The present invention relates to compact, low noise, ultra-short pulse sources based on fiber amplifiers, and various applications thereof. At least one implementation includes an optical amplification system having a fiber laser seed source producing seed pulses at a repetition rate corresponding to the fiber laser cavity round trip time. A nonlinear pulse transformer, comprising a fiber length greater than about 10 m, receives a seed pulse at its input and produces a spectrally broadened output pulse at its output, the output pulse having a spectral bandwidth which is more than 1.5 times a spectral bandwidth of a seed pulse. A fiber power amplifier receives and amplifies spectrally broadened output pulses. A pulse compressor is configured to temporally compress spectrally broadened pulses amplified by said power amplifier. Applications include micro-machining, ophthalmology, molecular desorption or ionization, mass-spectroscopy, and/or laser- based, biological tissue processing.
摘要:
Ein regenerativer Laserverstärker zur Verstärkung von Seedlicht weist einen Resonatorraum auf, eine polarisationsabhängige Ausgangskomponente (13; 23; 33, 32A), durch die Strahlung (S) aus dem Resonatorraum auskoppelbar ist und mindestens eine im Resonatorraum angeordnete und steuerbare Pockelszelle (PZ), wobei durch Ansteuerung der mindestens einen Pockelszelle (PZ) im Resonatorraum befindliche Strahlung (S) so polarisierbar ist, dass die Strahlung (S) durch die polarisationsabhängige Ausgangskomponente (13; 23; 33, 32A) aus dem Resonatorraum auskoppelbar ist. Ein polarisationsabhängiger Resonatorweg (PR-1; PR-2; PR-3) mit einem optischen Element (15; 25; 35) ist im Resonatorraum so angeordnet und derart ausgebildet, dass im Resonatorraum befindliche Strahlung (S) in Abhängigkeit von ihrer durch die mindestens eine Pockelszelle (PZ) steuerbare Polarisation entweder den polarisationsabhängigen Resonatorweg (PR-1; PR-2; PR- 3) unter einer ersten Wechselwirkung mit dem optischen Element (15; 25; 35) durchläuft oder den polarisationsabhängigen Resonatorweg (PR-1; PR-2; PR-3) ohne oder unter einer zweiten Wechselwirkung mit dem optischen Element (15; 25; 35) durchläuft. So kann z.B, die Pulsdauer des Laserpulses verlängert werden über die einstellbare Anzahl von Umläufen durch ein dispersives, optisches Element im Resonator während zur Auskopplung z.B. eine Frequenzkonversion in dem anderen Resonatorast erfolgt und deswegen kann dieser Laser für die Materialbearbeitung eingesetzt werden.
摘要:
A laser device capable to simultaneously generate light at multiple wavelengths that are independently (and, optionally, simultaneously) tunable without a limit of how small a spectral separation between such wavelengths can be made is enabled with the use of a laser-cavity network that (i) contains multiple spatially-distinct laser cavity portions all of which have at least one spatial region of the cavity network in common and (ii) is defined by such optical elements that prevent the intracavity amplification of light at first and second of multiple wavelengths at the expense of the same laser gain medium. Each of the distinct cavity portions contains a dedicated laser chip supporting the generation of light at a corresponding wavelength. In a special case, at least two of the multiple lasing wavelengths in the output of the device can be simultaneously and independently tuned to become equal.