Imaging system including beam guiding element having high solarization resistance in the blue spectral range
An imaging system, includes: a laser light source having a wavelength from 380 nm to 490 nm; and a beam guidance element, the laser light source configured for generating an average surface power density of more than 10 W/cm 2 , the beam guidance element including a glass which has a quality factor F(436 nm)=S(436 nm)*(Abs 0 (436 nm)+Abs 1 (436 nm))/k, wherein S(436 nm) is a thermality at a wavelength of 436 nm, Abs 1 (436 nm) is an additional absorbance in comparison to Abs 0 (436 nm) at a wavelength of 436 nm after an irradiation with a power density of 345 W/cm 2 for 72 hours with a laser light having a wavelength of 455 nm, Abs 0 (436 nm) is an absorbance at a wavelength of 436 nm of a sample having a thickness of 100 mm without the irradiation, k is the thermal conductivity, and the quality factor F(436 nm) is <15 ppm/W.
1 . An imaging system, comprising:
at least one laser light source B having a wavelength λ B in a spectral range from 380 nm to 490 nm; and
a beam guidance element, the at least one laser light source B being configured for generating, in at least one point of the beam guidance element, an average surface power density of more than 10 W/cm 2 , the beam guidance element including a glass which has a quality factor F(436 nm)=S(436 nm)*(Abs 0 (436 nm)+Abs 1 (436 nm))/k, wherein S(436 nm) is a thermality at a wavelength of 436 nm, Abs 1 (436 nm) is an additional absorbance in comparison to Abs 0 (436 nm) at a wavelength of 436 nm of a sample having a thickness of 100 mm after an irradiation with a power density of 345 W/cm 2 for 72 hours with a laser light having a wavelength of 455 nm, Abs 0 (436 nm) is an absorbance at a wavelength of 436 nm of a sample having a thickness of 100 mm without the irradiation, k is the thermal conductivity, and the quality factor F(436 nm) is <15 ppm/W.
2 . The imaging system according to claim 1 , wherein the at least one laser light source B is a diode laser.
3 . The imaging system according to claim 1 , wherein the beam guidance element is a prism.
4 . The imaging system according to claim 1 , wherein the at least one laser light source is configured for generating, in the at least one point of the beam guidance element, an average surface power density of 20 W/cm 2 to 300 W/cm 2 .
5 . The imaging system according to claim 1 , wherein S(436 nm), S(546 nm), and S(644 nm) are at most 50 ppm/K.
6 . The imaging system according to claim 1 , wherein Abs 0 (436 nm), Abs 0 (546 nm), and Abs 0 (644 nm) are less than 0.01/cm.
7 . The imaging system according to claim 1 , wherein Abs 1 (436 nm), Abs 1 (546 nm), and Abs 1 (644 nm) are less than 0.009/cm.
8 . The imaging system according to claim 1 , wherein the thermal conductivity k is more than 0.005 W/(cm*K).
9 . The imaging system according to claim 1 , wherein an average do/dT at a wavelength of at least one of 436 nm, 546 nm, and 644 nm in a temperature range from 20° C. to 40° C. is in a range from 0.1 to 8.0 ppm/K.
10 . The imaging system according to claim 1 , wherein the imaging system is configured for being used in a projector or in a materials processing.
11 . An imaging system, comprising:
at least one laser light source B having a wavelength λ B in a spectral range from 380 nm to 490 nm;
at least one laser light source G having a wavelength λ G in a spectral range from >490 nm to 585 nm;
at least one laser light source R having a wavelength λ R in a spectral range from >585 nm to 750 nm; and
a beam guidance element, the laser light source B, the laser light source G, and the laser light source R being configured for generating, in at least one point of the beam guidance element, an average surface power density of more than 10 W/cm 2 , the beam guidance element including a glass which has an induced absorbance Abs 1 (RGB)=Abs 1 (436 nm)+Abs 1 (546 nm)+Abs 1 (644 nm), wherein Abs 1 (RGB) is <0.03/cm.
12 . A beam guidance element, comprising:
a glass which has at least one of the following properties:
(a) a quality factor F(436 nm)=S(436 nm)*(Abs 0 (436 nm)+Abs 1 (436 nm))/k, wherein F(436 nm) is <15 ppm/W;
(b) a quality factor F(RGB)=F(436 nm)+F(546 nm)+F(644 nm)=S(436 nm)*(Abs 0 (436 nm)+Abs 1 (436 nm))/k+S(546 nm)*(Abs 0 (546 nm)+Abs 1 (546 nm))/k+S(644 nm)*(Abs 0 (644 nm)+Abs 1 (644 nm))/k, wherein F(RGB) is <40 ppm/W;
(c) an induced absorbance Abs 1 (436 nm)<0.01/cm; and
(d) an induced absorbance Abs 1 (RGB)=Abs 1 (436 nm)+Abs 1 (546 nm)+Abs 1 (644 nm), wherein Abs 1 (RGB) is <0.03/cm.
13 . The beam guidance element according to claim 12 , wherein the beam guidance element is selected from at least one of lenses, prisms, aspheres, plane plates, freeforms, fast axis collimators, and light-guiding rods.
14 . A glass, comprising:
at least one of the following properties:
(a) a quality factor F(436 nm)=S(436 nm)*(Abs 0 (436 nm)+Abs 1 (436 nm))/k, wherein F(436 nm) is <15 ppm/W;
(b) a quality factor F(RGB)=F(436 nm)+F(546 nm)+F(644 nm)=S(436 nm)*(Abs 0 (436 nm)+Abs 1 (436 nm))/k+S(546 nm)*(Abs 0 (546 nm)+Abs 1 (546 nm))/k+S(644 nm)*(Abs 0 (644 nm)+Abs 1 (644 nm))/k, wherein F(RGB) is <40 ppm/W;
(c) an induced absorbance Abs 1 (436 nm)<0.01/cm; and
(d) an induced absorbance Abs 1 (RGB)=Abs 1 (436 nm)+Abs 1 (546 nm)+Abs 1 (644 nm), wherein Abs 1 (RGB) is <0.03/cm.