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We propose a free-space terminator and ultra-broad-band interferometry in the microwave to infrared domains. The device is based on a ldquocoherent black-bodyldquo effect using an extremely thin metallic layer in a ring (Sagnac) interferometer.
We use a single supercontinuum laser source to simultaneously excite multiple types of fluorescent dyes and collect the entire emission spectrum ranging from visible to near infrared, without using band pass filters and dichroic mirrors.
We successfully demonstrated NO2 detection based on differential absorption cavity ringdown spectroscopy using a dual wavelength passively locked external cavity diode laser. Selective trace NO2 detection was achieved in a 2 ml compact ringdown cell.
We describe the fabrication of a novel type of saturable absorber mirrors based on polymer embedded carbon nanotubes and we demonstrate their performance in mode-locking an Er/Yb:glass laser: 68 fs (45fs Fourier limit) at 85 MHz repetition-rate.
A 5.1 nm thick film of high oscillator strength J-aggregated dye, which gives rise to strong optical coupling, critically couples to a single dielectric mirror, absorbing 97% of incident light (effective absorption coefficient of 6.9 times 106 cm-1).
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