Arbitrary manipulation of amplitude and phase of a set of highly discrete coherent spectra

We describe the attractive optical nature of highly discrete coherent spectra. We show that the relative amplitude and phase of such spectra can be almost arbitrarily manipulated by simply placing three fundamental optical elements—namely, a waveplate, polarizer, and dispersive plate—on an optical axis and then controlling their thicknesses. We also describe the relevant physical mechanism. Furthermore, as a typical application of this optical nature, we demonstrate arbitrary optical waveform generation in a numerical experiment, and we discuss its limitations as an optical-wave manipulation technology and how we can overcome these limitations

Hyperfine structure of molecular iodine measured using a light source with a laser linewidth at the megahertz level

The hyperfine structure of the absorption lines of molecular iodine at 531 nm was measured using a low-cost, coin-sized light source with a laser linewidth at the megahertz level. The measured hyperfine splittings were found to be systematically smaller than those measured using a narrow-linewidth diode laser. The theoretical fit of the measured hyperfine splittings to a four-term Hamiltonian, including the electric quadrupole, spin-rotation, tensor spin-spin, and scalar spin-spin interactions, does not clarify the observed systematic deviation in the measurement, but instead results in deviated hyperfine constants from reliable literature values beyond the uncertainties. Therefore, the theoretical fit, which is usually used to validate the measurement, does not provide the validation function in the case of megahertz level laser linewidths

A compact frequency-stabilized pump laser for wavelength conversion in long-distance quantum communication

We demonstrate a compact frequency-stabilized laser at 1064 nm using Doppler-free saturation absorption spectroscopy of molecular iodine. The achieved laser frequency stability and linewidth are 5.7 10-12 (corresponding to an uncertainty of the laser frequency of 1.6 kHz) and 400 kHz, respectively. The developed frequency-stabilized laser can be used as a pump laser for wavelength conversion from visible to telecom (or vice versa) to connect quantum memories utilizing nitrogen-vacancy centers in diamond at remote nodes in fiber-based quantum communication.Comment: 5 pages, 6 figures, JOSAB accepte

Dual-frequency injection-locked continuous-wave near-infrared laser

We report a dual-frequency injection-locked continuous-wave near-infrared laser. The entire system consists of a Ti:sapphire ring laser as a power oscillator, two independent diode-lasers employed as seed lasers, and a master cavity providing a frequency reference. Stable dual-frequency injection-locked oscillation is achieved with a maximum output power of 2.8 W. As fundamental performance features of this laser system, we show its single longitudinal/transverse mode characteristics and practical power stability. Furthermore, as advanced features, we demonstrate arbitrary selectivity of the two frequencies and flexible control of their relative powers by simply manipulating the seed lasers.Comment: 8 pages, 4 figure

超短パルス高強度レーザーによるコヒーレント回転分子からの高次高調波発生

京都大学0048新制・課程博士博士(エネルギー科学)甲第15500号エネ博第221号新制||エネ||48(附属図書館)27978京都大学大学院エネルギー科学研究科エネルギー応用科学専攻(主査)教授 宮崎 健創, 教授 大垣 英明, 教授 岸本 泰明学位規則第4条第1項該当Doctor of Energy ScienceKyoto UniversityDA

The Simplest Method for Generation of an Attosecond Pulse Train

We report an extremely simple approach to generate an attosecond pulse train from more than octave-spanning discrete spectrum by only positioning transparent materials into the optical path without spatially dispersing the frequency components