摘要:
A system for conversion or amplification using quasi-phase matched nonlinear optical wave-mixing includes a first radiation source for providing a pump radiation beam, a second radiation source for providing a signal radiation beam, a bent structure for receiving the pump radiation beam and the signal radiation beam, and an outcoupling radiation propagation portion for coupling out an idler radiation beam generated in the bent structure. A radiation propagation portion of the bent structure is made of a uniform three-dimensional material at least partly covered by a two-dimensional or quasi-two-dimensional material layer and has a dimension taking into account the spatial variation of the nonlinear optical susceptibility along the radiation propagation portion as experienced by radiation traveling along the bent structure for obtaining quasi-phase matched nonlinear optical wave-mixing in the radiation propagation portion. The dimension thereby is substantially inverse proportional with the linear phase mismatch for the nonlinear optical process.
摘要:
A pulsed laser system may include a Raman fiber that is configured to act as multiple wavelength Raman laser. The fiber is configured to receive a pulsed input beam from an input source and convert the input beam to an output beam having narrow band outputs at first and second frequencies v1 and v2.
摘要:
The inorganic optical filter of the invention consists of a NdF 3 single crystal. The optical element of the invention comprises a wavelength conversion element wherein incident light is subjected to wavelength conversion to twice the frequency by quasi-phase-matching using primary matching or tertiary matching, and emitted, and an inorganic optical filter situated in the optical path of light emitted from the wavelength conversion element, wherein the wavelength conversion element consists of a ferroelectric fluoride single crystal represented by Ba 1-y (Mg 1-x Zn x ) 1+ yF 4 (where 0 x ≤ 1, and -0.2 y ≤ 0.2), and the inorganic optical filter consists of a NdF 3 single crystal.
摘要:
Einrichtung (10) zur Erzeugung von polarisationsverschränkten Photonen mittels parametrischer Abwärtskonvertierung mit einer Wellenleiterstruktur, die in einem Substrat aus optisch nichtlinearem Material mit periodisch gepolten Bereichen ausgebildet ist, und die zwei Wellenleiter (26, 27) aufweist, wobei im Betrieb dem einen Wellenleiter (26) über einen Strahlteiler (30) ein Anteil α der Pumpphotonen (p) und dem anderen Wellenleiter (27) der restliche Anteil (1- α) der Pumpphotonen (p) zuführbar ist, wobei die Pumpphotonen (p) im einen Wellenleiter (26) in vertikal polarisierte und im anderen Wellenleiter (27) in horizontal polarisierte Signal- (s) und Idlerphotonen (i) zerfallen, die über eine Vereinigungsstrecke (31) einer Vorrichtung (34) zur spektralen Trennung von Signal- und Idlerphotonen zugeführt werden; zumindest dem anderen Wellenleiter (27) ist ein thermisches (40) und/oder elektrooptisches Abstimmelement (28, 29) zur Feineinstellung der Wellenlängenverhältnisse bei der Abwärtskonvertierung zugeordnet; zumindest dem einen Wellenleiter (26) ist eine elektrooptische Einrichtung (29, 39) zur Justierung der relativen Phasenlage zwischen den horizontal und vertikal polarisierten Zuständen, die an der Trennvorrichtung (34) zugeordneten Ausgängen (35, 36) anliegen, zugeordnet.
摘要:
When a wavelength of a first laser beam (23) with which a first recording medium (17) including a first recording layer is recorded and reproduced is indicated as lambda 1 (nm), a wavelength of a second laser beam (24) with which a second recording medium (18) including a second recording layer is recorded and reproduced as lambda 2 (nm), the relationship between the wavelength lambda 1 and the wavelength lambda 2 is set to be expressed by 10
摘要:
Adjacent non-linear optical layers in a stack of at least two such layers are joined by a glass layer to form a device such as a parametric oscillator, frequency doubler or birefringent phase matched device. The indices of the layers and glass are preferably matched within 30%, and for non-linear infra-red or thermally sensitive materials such as gallium arsenide, zinc selenide, lithium niobate and ZnGeP2 the glass is preferably a low melting chalcogenide glass comprising GE, As, Se ant Te. The non-linear layers may comprise a grating, e.g. striated or periodically poled.
摘要:
A non-linear optical device such as a frequency changer, parametric amplifier or mixer comprises a stack of grating layers (1, 2, 3 )of non-linear optical material. Each grating layer comprises at least one grating (5) and is bonded in spaced relation to adjacent grating layers (4), preferably by a glass consisting essentially of germanium, arsenic, selenium and a relatively high proportion of tellurium. As described, the gratings (5) in a layer are spaced and formed by periodic electrical poling. The periodicity in adjacent layers may be the same or different. The layers may be of material useful in the infra-red. The layers may be formed of GaAs, ZnSe, ZnGeP2, lithium niobate, potassium, titanyl phosphate of rubidium titanyl arsenate.