Abstract:
A system and method for performing four dimensional multicolor nanotomography with high harmonics and attosecond pulses to attain spectrally resolved absorption data about the three-dimensional volumetric structure of a sample are disclosed. Also disclosed are embodiments of the system and method that have been adapted to perform four dimensional multicolor nanotomography absorption and index of refraction data about the three- dimensional volumetric structure of a sample, to perform five dimensional multicolor nanotomography with high harmonics and attosecond pulses to obtain spectrally resolved absorption data about the three-dimensional volumetric structure and temporal dynamics of the sample, to perform five dimensional multicolor nanotomography to obtain spectrally resolved absorption and index of refraction data about the three-dimensional volumetric structure and temporal dynamics of the sample, and to perform Fourier-domain Optical Coherence Tomography.
Abstract:
Briefly, methods and/or systems, are described for a wavelength-dispersive mode-locked fiber-ring laser, which generates an Airy beam profile for stable optical pulses.
Abstract:
Die Erfindung betrifft eine Ultrakurzpulspumpquelle (1) mit mindestens einer Seedpulsquelle (2) zur Erzeugung eines Seedpulslaserstrahls (3) wenigstens einem Laserverstärkungsmedium (4) zur Verstärkung des Seedpulslaserstrahls, sowie einer Strahlführungsoptik (5) zur Führung des Seedpulslaserstrahls (3) über das Laserverstärkungsmedium (4). Die Ultrakurzpulspumpquelle zeichnet sich dadurch aus, dass die Ultrakurzpulspumpquelle (1) wenigstens eine zweite Seedpulsquelle (6) zur Erzeugung eines zum ersten Seedpulslaserstrahls (3) synchronen zweiten Seedpulslaserstrahls (7), und ferner einen Strahlkombinierer (8) zur räumlichen Überlagerung des ersten und zweiten Seedpulslaserstrahls (3,7) im Laserverstärkungsmedium (4) umfasst.
Abstract:
The present invention relates to a device and a method for pulse modulation of laser pulses of tunable laser sources. The invention relates specifically to an arrangement for spectral and/or temporal laser beam manipulation of tunable lasers using nonlinear wave interaction. By using a variable, lens based beam forming section it is possible to manipulate a laser pulse provided by a tunable laser source (i.e. tunable in pulse energy, temporal pulse length and/ or wavelength) or different laser sources (i.e. different with respect to pulse energy, temporal pulse width and/ or wavelength) in such a manner, that nonlinear wave interaction can occur in the most efficient way. The beam forming section according to the invention allows for adjusting the waist of the laser beam and the focal position of the laser beam inside a cell comprising a nonlinear medium.
Abstract:
A wavelength separating element is provided for separating a converted beam from a fundamental beam in an NLFC device, wherein the converted beam has a wavelength different from a wavelength of the fundamental beam. The wavelength separating element includes a first mirror surface and a second mirror surface opposite to the first mirror surface. The first and second mirror surfaces may have a high reflectivity of the converted beam relative to a reflectivity of the fundamental beam, and the first and second mirror surfaces are configured such that the fundamental and converted beams undergo multiple reflections between the first mirror surface and the second mirror surface to separate the converted beam from the fundamental beam. The fundamental and converted beams undergo at least three reflections at the first and second mirror surfaces, and/or undergo at least two reflections at one of the first mirror surface or the second mirror surface.
Abstract:
A system for generating an optical frequency standard is described. The system comprises a first laser source for generating a first laser output at a first frequency, a first second harmonic generator receiving as an input the first laser output to generate a frequency-doubled first laser output at a doubled first frequency, a second laser source for generating a second laser output at a second frequency different from the first frequency and a second harmonic generator receiving as an input the second laser output to form a frequency-doubled second laser output at a doubled second frequency. The system further includes a two-colour stabilisation arrangement to stabilise a sum of the doubled first and the doubled second frequencies that includes an interaction region incorporating a laser active material having a two-photon transition from a first energy level to a second energy level which receives as an input the frequency-doubled first laser output and the frequency-doubled second laser output where these outputs are selected to together cause the two-photon transition from the first energy level to the second energy level using an intermediate energy level to enhance the two-photon transition rate. The system also includes a detector to detect an indicator of the two-photon transition occurring in the interaction region which generates a frequency stabilisation signal for modifying either the first laser output or the second laser output to stabilise the sum of the doubled first frequency and the doubled second frequency to the two-photon transition based on the indicator and a stabilised optical output generator that includes a sum frequency generator receiving as an input the first laser output and the second laser output to generate a stabilised optical output with a frequency corresponding to the optical frequency standard.
Abstract:
본 발명은 레이저 모듈 제작방법 및 레이저 모듈 패키지에 관한 것으로서, 레이저 모듈 제작방법은, 광학소자를 마운트 지그에 부착하는 (a)단계; 상기 마운트 지그를 광학 정렬 시스템에 고정하는 (b)단계; 상기 광학 정렬 시스템이 고정된 마운트 지그를 베이스 부재의 상측에 배치하는 (c)단계; 상기 광학소자를 상기 광학 정렬 시스템으로 정렬하는 (d)단계; 상기 마운트 지그와 상기 베이스 부재가 밀착되도록 하는 (e)단계; 상기 마운트 지그와 상기 베이스 부재가 고정되도록 레이저 웰딩을 수행하는 (f)단계; 및 상기 광학 정렬 시스템을 제거하는 (g)단계;를 포함하며, 다축 미세 정렬을 필요로 하는 광학소자를 일일이 수작업으로 정렬하여 나사와 같은 고정수단으로 고정하는 종래의 방식과 달리 자동화 장치로 정밀하게 정렬하고, 부품 고정을 위해 레이저 웰딩을 수행함으로써, 신속성과 정밀성 및 제작된 모듈의 고신뢰성을 가질 수 있는 효과가 있다.
Abstract:
A method and a pulse compressor (1) for compressing an optical pulse, wherein the pulse compressor comprising a bulk quadratic nonlinear medium (2) adapted for generating a negative nonlinear phase variation on the optical pulse and having a negative group-velocity dispersion, and a dispersive unit (3) with a net positive dispersion. Furthermore, the net positive dispersion in the dispersive unit at least partially compensates for the negative nonlinear phase variation and the negative group-velocity dispersion produced by the bulk quadratic nonlinear medium when the optical pulse passes through the bulk quadratic nonlinear medium and subsequently through the dispersive unit thereby generating a temporally compressed optical pulse. For 1 micron lasers second-harmonic generation at high intensities yields spectral broadening due to self-defocusing by the Kerr-nonlinearity which can subsequently be compressed by providing normal dispersion. As KDP crystals can be glued together, large apertures of the pulse compressor are possible making this method suitable for pulse compression in Joule-class lasers.