منابع مشابه
Cavity-enhanced optical feedback-assisted photo-acoustic spectroscopy with a 10.4 lm external cavity quantum cascade laser
An ultra-sensitive photo-acoustic spectrometer using a 10.4 lm broadly tunable mid-IR external cavity quantum cascade laser (EC-QCL) coupled with optical feedback to an optical power buildup cavity with high reflectivity mirrors was developed and tested. A laser optical power buildup factor of 181 was achieved, which corresponds to an intra-cavity power of 9.6 W at a wavelength of 10.4 lm. With...
متن کاملA Hybrid Laser-driven E-beam Injector Using Photo-cathode Electron Gun and superconducting Cavity
A laser-driven photo-cathode electron gun capable of producing pulsed electron beams of 100 KeV with a duration of 35 ps was constructed as a continuing effort towards a high-brightness superconducting RF injector. Various species of photo-cathodes can be obtained either by ion implantation, CVD or ion enhanced deposition in the preparation chamber attached to the injector. A number of photo-ca...
متن کاملCharacterization of 2.3m GaInAsSb-based vertical-cavity surface-emitting laser structures using photo-modulated reflectance
We report angle dependent and temperature dependent (9 K–300 K) photo-modulated reflectance (PR) studies on vertical-cavity surface-emitting laser (VCSEL) structures, designed for 2.3 lm mid-infrared gas sensing applications. Changing the temperature allows us to tune the energies of the quantum well (QW) transitions relative to the VCSEL cavity mode (CM) energy. These studies show that this VC...
متن کاملGradual time reversal in thermo- and photo-acoustic tomography within a resonant cavity
Abstract Thermoand photo-acoustic tomography require reconstructing initial acoustic pressure in a body from time series of pressure measured on a surface surrounding the body. For the classical case of free space wave propagation, various reconstruction techniques are well known. However, some novel measurement schemes place the object of interest between reflecting walls that form a de facto ...
متن کاملFabrication, Treatment and Testing of a 1.6 Cell Photo- Injector Cavity for Hzb*
As an amendment to a CRADA (Cooperative Research and Development Agreement) between Forschungszentrum Dresden (FZD) and JLab we have fabricated and tested after appropriate surface treatment a 1.6 cell, 1300 MHz RRR niobium photo-injector cavity to be used in a demonstration test at HZB. Following a baseline test at JLab, the cavity received a lead spot coating of ~8 mm diameter deposited with ...
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ژورنال
عنوان ژورنال: Journal of the American Medical Association
سال: 1910
ISSN: 0002-9955
DOI: 10.1001/jama.1910.92550330001001k