Abstract:
A broad line red light generator is configured with a single mode (SM) pulsed ytterbium ("Yb") fiber laser pump source outputting pump light in a fundamental mode ("FM") at a pump wavelength which is selected from a 1030 - 1120 nm wavelength range. The disclosed generator further includes a SM fiber Raman converter spliced to an output of the Yb fiber laser pump source. The Raman converter induces an "n" order frequency Stokes shift of the pump light to output the pump light at a Raman-shifted wavelength within 1220 and 1300 nm wavelength range with a broad spectral line of at least 10 nm. The disclosed light generator further has a single pass second harmonic generator ("SHG") with a lithium triborate ("LBO") nonlinear optical crystal having a spectral acceptance linewidth which is sufficient to cover the broad spectral line of the pump light. The SHG generates a SM pulsed broad-line red light with a broad spectral line of at least 4 nm.
Abstract:
Apparatus (1) is configured to provide output light. The apparatus (1) comprises a first optical parametric oscillator (2) to produce first signal light (S1) and first idler light (I2) in response to pump light (P). The first optical parametric oscillator (2) comprises a first cavity (4) and a first nonlinear optical element (5) in the first cavity (4). The first cavity (4) is configured to resonate one (S1) of the first signal light (S1) and first idler light (I1). The apparatus (1) also comprises a second optical parametric oscillator (3) to produce second signal light (S2) and second idler light (I2) in response to the resonated one (S1) of the first signal light (S1) and first idler light (I2), wherein at least one of the second signal light (S2) and second idler light (12) corresponds to the output light. The second optical parametric oscillator (3) comprises a second cavity (7) and a second nonlinear optical element (8) in the second cavity (7). The second nonlinear optical element (8) is also in the first cavity (4).
Abstract:
A terahertz image beam is upconverted by a nonlinear optical process (e.g., sum- or difference-frequency generation with a near IR upconverting beam). The upconverted image is acquired by a near IR image detector. The terahertz image beam and upconverting beam comprise trains of picosecond pulses. The bandwidths and center wavelengths of the terahertz image beam and the upconverting beam are such that wavelength filtering can be employed to permit an upconverted image beam to reach the detector while blocking or substantially attenuating the upconverting beam.
Abstract:
A tunable coherent radiation source comprises a pump laser which outputs a pump beam and a non-linear optical medium having a tuning pattern to provide tuning across a wavelength range. A translation system is arranged such that the pump beam is translated across the tuning pattern. The scanning pattern is formed such that translation of the pump beam across the tuning pattern provides one or more discontinuities in tuning across the wavelength range. A spectroscopic system and a hyperspectral imaging system comprising such a tunable coherent radiation source are described, as is a non-linear optical medium adapted for use in such a source. A method of providing coherent radiation tuned over a wavelength range is also described.
Abstract:
Die Erfindung betrifft eine Anordnung (1) zur Frequenzkonversion von Laserstrahlung, umfassend: einen ersten nichtlinearen Kristall (5), in dem aus einem ersten, eintretenden Laserstrahl (2) mit einer ersten Wellenlänge (λ 1 ) durch Frequenzverdopplung ein zweiter Laserstrahl (6) mit einer zweiten Wellenlänge (λ 2 ) erzeugt wird, der kollinear zum ersten Laserstrahl (2) verläuft, einen zweiten nichtlinearen Kristall (9), in dem aus dem ersten und zweiten Laserstrahl (2, 6) durch Frequenzmischung ein dritter Laserstrahl (10) mit einer dritten Wellenlänge (λ 3 ) erzeugt wird, sowie eine zwischen dem ersten und dem zweiten nichtlinearen Kristall (5, 9) angeordnete Optik (7, 8) zur räumlichen Separation des ersten Laserstrahls (2) vom zweiten Laserstrahl (6). Die Optik weist mindestens eine Linse (7, 8) auf, durch die der erste und zweite Laserstrahl (2, 6) versetzt und/oder verkippt zur optischen Achse (7a, 8a) hindurchtreten, um die räumliche Separation zu bewirken. Die Erfindung betrifft auch ein zugehöriges Verfahren zur Frequenzkonversion.
Abstract:
Described herein is a method for determining second- order nonlinear optical coefficients of a material. The method envisages the steps of providing a specimen (1;35) made at least in part of the material, causing a first optical signal (Si1) and a second optical signal (Si2) having, respectively, a first pulsation and a second pulsation, and a first polarization state and a second polarization state, to impinge upon the specimen in such a way that the specimen generates a second-harmonic optical signal (su3) having a third pulsation equal to the sum of the first and second pulsations, and a third polarization state that is a function of the first and second polarization states. The method further envisages the step of determining a plurality of measurements of power corresponding to the second-harmonic optical signal, and the step of determining the second-order nonlinear optical coefficients on the basis of the plurality of measurements of power. In addition, the method envisages performing a plurality of measurements of power of the second-harmonic optical signal as the first polarization state and the second polarization state vary.
Abstract:
Described herein is a method for determining second- order nonlinear optical coefficients of a material. The method envisages the steps of providing a specimen (1;35) made at least in part of the material, causing a first optical signal (S i1 ) and a second optical signal (S i2 ) having, respectively, a first pulsation and a second pulsation, and a first polarization state and a second polarization state, to impinge upon the specimen in such a way that the specimen generates a second-harmonic optical signal (s u3 ) having a third pulsation equal to the sum of the first and second pulsations, and a third polarization state that is a function of the first and second polarization states. The method further envisages the step of determining a plurality of measurements of power corresponding to the second-harmonic optical signal, and the step of determining the second-order nonlinear optical coefficients on the basis of the plurality of measurements of power. In addition, the method envisages performing a plurality of measurements of power of the second-harmonic optical signal as the first polarization state and the second polarization state vary.
Abstract:
An apparatus for producing coherent, pulsed ultraviolet light with pulse durations that range between 1 ps and 1 microsecond includes one or more source lasers in the visible or near-infrared frequency range. The apparatus also includes one or more FC stages, at least one of the one or more FC stages including a nonlinear FC device and one or more optical elements. The optical elements include a reflector, a focusing element, a polarization controlling optic, a wavelength separator, or a fiber optic component. The FC device includes a huntite-type aluminum double borate nonlinear optical material configured to produce FC light having a wavelength between 190 and 350 nm. The nonlinear optical material is characterized by an optical transmission greater than 70% over the wavelength range of 190 to 350 nm.
Abstract:
A method for generating a fourth harmonic solid laser, generating a second harmonic by interacting a high power fundamental wavelength with a second harmonic nonlinear optical crystal (9), generating a fourth harmonic by entering the second harmonic into a fourth harmonic nonlinear optical crystal (12). A method is used that the second harmonic is reflected time after time in a cavity or out a cavity so as to generate an accumulative fourth harmonic. Therefore, the method can attain high efficiency and the stabilizing output frequency. The nonlinear optical crystal has long life.