摘要:
A system includes an optical parametric oscillator (OPO) device. The OPO device has an optical resonator, a first nonlinear optical element (NLO) and a second non-linear optical element (NLO). The first NLO can produce, via OPO of a first pump beam, a first output with a first frequency and a second output with a second frequency. The second frequency is lower than the first frequency. The second NLO can produce, via OPO of a second pump beam (with a higher frequency than the first), a third output with a third frequency and a fourth output with a fourth frequency. The fourth frequency is lower than the third frequency. The first frequency is the same, or at least substantially the same, as the fourth frequency. The OPO device is configured to resonate at the first frequency and the fourth frequency.
摘要:
A system includes a first light source (102) that includes a resonator with a continuous wave, multi longitudinal mode laser (116) and an external resonator(104) that includes a nonlinear optical element (122). The external resonator is configured to receive an output from the first light source. A free spectral range of the external resonator is coordinated with a mode spacing of the first light source such that at least a significant fraction of the modes in the output from the first light source enters the external resonator and resonates in the external resonator, thereby enhancing an intensity of the modes that enter the external resonator, which leads to an efficient frequency conversion of the modes that enter the external resonator at the nonlinear optical element of the external resonator.
摘要:
A laser-operated light source encompasses a chamber for accommodating a gaseous medium for generating a plasma, which emits radiation in response to the operation of the light source under the impact of the laser radiation. The light source encompasses a housing for accommodating the chamber. The invention provides for optical filter means, which are assigned to the housing and/or which are arranged downstream from the housing in the light path of emitted radiation. The optical filter means serve to spectrally filter the radiation emitted by the plasma in response to the operation of the light source.
摘要:
A contactless dental device 2 for determining tooth colors includes illuminating means for illuminating with ambient illumination light a tooth 6 to be examined. At least one color sensor 8 for acquisition and spectral examination of light reflected by the tooth 6 is inventively provided, wherein filtering means 16 are associated with the color sensor for at least partial separation of a signal component originating from the illumination light from the signal component originating from the ambient light. Evaluating means 18 for determining the tooth color based on the signal component originating from the illumination light are disposed downstream of the filtering means 16.
摘要:
Ein nichtpolarisierender Strahlteiler 2 weist wenigstens zwei Substrate 4, 4' auf, zwischen denen eine eine Schichtenfolge von Brechungsschichten 14, 16, 18 aufweisende Beschichtung 6 aufgenommen ist, wobei die Schichtenfolge jeweils wenigstens eine Schicht 14 aus niedrigbrechendem Material, wenigstens eine Schicht 16 aus mittelbrechendem Material und wenigstens eine Schicht 18 aus hochbrechendem Material aufweist, wobei die Brechungsschichten 14, 16, 18 aus dielektrischem Material bestehen. Erfindungsgemäß ist die Schichtenfolge 14, 16, 18 metallschichtfrei ausgebildet, wobei die Substrate 4, 4' die gleiche Brechzahl haben und die Brechzahl der Substrate > 1,55 ist.
摘要:
Ein nichtpolarisierender Strahlteiler 2 weist wenigstens ein Substrat 4, 4' auf, auf das eine teilreflektierende, eine Mehrzahl von Schichten 12, 14, 14', 16, 16' aufweisende Beschichtung 6 aufgebracht ist. Erfindungsgemäß weist die Schichtenfolge der Beschichtung 6 wenigstens eine Metallschicht 12, wenigstens zwei erste Brechungsschichten 14, 14' aus einem hoch-oder mittelbrechenden dielektrischen Material und wenigstens zwei zweite Brechungsschichten aus einem niedrig- oder mittelbrechenden dielektrischen Material auf.