Mirrors dielectric

Fig. 15. Simplified diagram of scanning Fabry - Perot interferometer77 showing piezoelectric ceramic tube (P), multilayer dielectric mirrors (Mj, M2), micrometer adjustment for parallelism (X, Y). Mirror spacing (d) is adjustable...

VF. 25 Dielectric Mirrors from Newport Corporation, 1791 Degre Ave, Irvine, California 92714. 

Samples of 1 (200 mg) were sealed in evacuated Pyrex ampoules (inner diameter 4 mm) and immersed in a 500-mL Pyrex beaker filled with ice and water in such a way that no ice blocked the laser beam. The beam of an excimer laser (Lambda Physics, EMC 201 XeCl 17 ns pulses 50 Hz repetition rate 3 h X = 308 nm) was positioned vertically using two dielectric mirrors and focused to the desired intensity by a quartz-lens with a focal length of 20 cm. For low intensity irradiations, the ampoules were placed in front of a mercury arc at a distance of 5 cm. The product ratio depended on the light intensity. The compounds 1, 2, 3 and 4 were separated by gas chromatography or HPLC on RP18 and spectroscopically characterized after 93-97% conversion to 3 and 4. 

Fig. 19 PDLC-SLM. LC liquid crystal droplet M dielectric mirror A light absorption layer BSO photoconductive layer O optical cement PW writing beam PR reading beam.

Experiments were performed using a visible optical parametric amplifier based on noncollinear phase-matching in /3-barium borate, followed by a pulse compressor using chirped dielectric mirrors. This optical source provides ultrabroadband pulses, with bandwidth extending from 500 to 720 nm, compressed to an almost transform-limited duration of 5-6 fs. The pump-... 

Figure 2. Schematic representation of the experimental apparatus. Key CL, cylindrical lens DM, dielectric mirror SL, spherical lens and DF, neutral density filter.

The second setup used a Lumonics laser with an electrode set that yielded nominal 35 nsec pulses. The beam transmitted by a 98% reflecting dielectric mirror provided the reference both incident energy and transmittance were measured with a dual head Laser Precision pyroelectric joulemeter. The sample position was moved with respect to the focal plane of a 475mm focal length lens (between lens and focus) for small variations in intensity, and... 

Historically, polymers played a decisive role in the understanding of differences between laser treatment with nanosecond laser pulses and the fs domain [31, 32]. Another motivation for the investigation of the basics of laser-material interaction with nonabsorbing samples was the unwanted damage to optical elements (e.g., dielectric mirrors [39]) in the beam path of short-pulse lasers. The destruction of these components limits the performance of short-pulse oscillators and amplifiers. Additionally, frequency con-... 

Hart S. D., Maskaly G. R., Temelkuran B., Prideaux P. H., Joannopoulos J. D., Fink Y. External reflection from omnidirectional dielectric mirror fibers Science 296, 510 (2002). 

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