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LASER MICROBEAM AND MEDICAL PROGRAM (LAMMP) SEMINARS

Recent progress in Quantum Cascade Lasers as a mid-infrared laser source

Tatsuo Dougakiuchi, PhD and Yu Takiguchi, MS

Dr. Dougakiuchi:
Quantum cascade (QC) lasers are promising light sources for a variety of spectroscopic applications in the mid-infrared spectral range, which is commonly known as the molecular fingerprint region. In 1994, the first laser radiation of a QC laser in pulsed operation at cryogenic temperature was observed by J. Faist and co-workers at Bell Labs. After two decades, QC lasers have been known as the most suitable light sources for high-accuracy gas detection because of their inherently narrow line width with a distributed feedback technique, high output power in continuous wave (cw) operation at room temperature, and their compact module.
In this talk, from fundamental principle of operation of QC laser to recent progress in broadband property is introduced. Additionally, spectroscopic applications of QC lasers are also introduced.
Mr. Takiguchi's Title
Liquid Crystal Spatial Light Modulator and its Applications

Mr. Takiguchi's Abstract
Phase-only Spatial light modulator (SLM) technology is more than four decades old but its potential remains largely untapped. We have successfully developed a Liquid Crystal on Silicon (LCOS) type SLM using liquid crystal and thin-layer technologies specialized for wavefront control. It features excellent phase modulation linearity, so diffracted laser light generates an accurate beam pattern corresponding to the computer generated hologram (CGH) written onto the LCOS-SLM device. The resulting beam configuration can be used to drill, cut, and weld materials in a variety of complex patterns. LCOS-SLM devices also have high light-utilization efficiency features, which offer big advantages for high power laser or very weak optical detection in biological applications, such as optical tweezers, adaptive optics and aberration correction. We are now focusing attention on aberration correction for deep live cell imaging with confocal laser scanning microscope in a thick biological specimen.


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