We developed a 1.5 μm eye-safe wavelength high-gain and high-average power laser amplifier using an Er,Yb:glass planar waveguide for coherent Doppler LIDAR. Applying the planar waveguide structure, high-average output power with near single transverse mode was realized. Consequently, high-gain and high-efficient operation were achieved by multi-bounce optical path configuration. Amplifying the ...

We experimentally demonstrate generation of bright sub-Poissonian light by means of parametric deamplification in a phase-sensitive fiber amplifier that is based on a balanced nonlinear Sagnac interferometer. On direct detection, the photocurrent noise falls below the shot-noise limit by (0.6 +/- 0.2) dB (1.4 dB when corrected for detection losses). To observe the noise reduction we employed a ...

A new type of confocal fluorescence microscope with an unprecedented resolution is proposed. Calculations demonstrate that an axial resolution on the order of 100 nm can be achieved in a confocal microscope with enlarged aperture when two-photon excitation is applied. This axial resolution is up to four times higher than that ofa confocal fluorescence microscope. The proposed microscope yields ...

An optical parametric chirped pulse amplifier fully based on Yb lasers at 500 kHz is described. Passive optical-synchronization is achieved between a fiber laser-pumped white-light and a 515 nm pump produced with a 200 W picosecond Yb:YAG InnoSlab amplifier. An output power up to 19.7 W with long-term stability of 0.3% is demonstrated for wavelength tunable pulses between 680 nm and 900 nm and ...

This paper presents a dark current suppression technique for a light detector in a variable-temperature system. The light detector architecture comprises a photodiode for sensing the ambient light, a dark current diode for conducting dark current suppression, and a current subtractor that is embedded in the current amplifier with enhanced dark current cancellation. The measured dark current of ...

In present day society where communication technologies are advancing at spiral rate, the need for efficient integrated circuit design to transmit and receive signals at unlicensed frequency spectrum is inevitable. This study tries to shed new light on the latter topic by evaluating the issues associated with the design in advanced CMOS technologies of a critical RF building block, namely a sin...

We have developed an ultrabroad-band regenerative amplifier with a mirrorless cavity to eliminate the limitation of bandwidth of dielectric coats on cavity mirrors. A large amount of material dispersion in Pellin-Broca prisms which are used instead of the cavity mirrors is compensated using a hybrid technique of Brewster prism pairs in the regenerative amplifier and an adaptive phase controller...

A novel, pulse-modulated spectroscopic system for measuring fractional leghemoglobin oxygenation and infected cell O(2) concentration (O(i)) in intact attached nodules of soybean (Glycine max) is described. The system is noninvasive and uses a pulsed (1000 Hertz) light-emitting diode coupled to an optical fiber to illuminate the nodule with light at 660 nanometer. A second optical fiber receive...

We propose a source of multimode squeezed light that can be used for superresolving microscopy. This source is an optical parametric amplifier with a properly chosen diaphragm on its output and a Fourier lens. We demonstrate that such an arrangement produces squeezed prolate spheroidal waves that are the eigenmodes of the optical imaging scheme used in microscopy and discuss the conditions of t...

We demonstrate the use of a femtosecond pulse-shaping apparatus for electronically programmable phase filtering of amplified spontaneous emission from an erbium-doped fiber amplifier. Pulse shaping applied to a broadband incoherent light (noise) input results in reshaped noise, with a specially tailored electric field correlation function. Our experiments clearly reveal that phase filtering can...