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Passively Q-switched microchip lasers have proved to be ideal laser sources for efficient wavelength conversion. These lasers have several advantages, such as, simple construction, compact size and ease-of-use. They also provide very high peak powers that enable efficient wavelength conversion. Recently, we have used the sub-nanosecond ‘pulse-gap’ region of Nd:YAG/Cr4+:YAG passively Q-switched microchip...
A real-time displacement sensor based on a laser diode interferometer that has a coaxial structure is proposed and demonstrated. Several measurements indicate measurement accuracy of 0.1 mum.
This article suggests using filamentation effect of intense femtosecond pulses. Intensity of the light pulse becomes very high in filament, and interaction length for frequency conversion can be long. Here, efficient deep-ultraviolet (DUV) and mid- infrared (MIR) sub-20-fs pulse generation by four-wave mixing processes through filamentation in gases is demonstrated. For MIR pulse generation, air was...
We demonstrate a widely tunable ring-cavity tellurite fiber Raman laser covering the S+C+L+U band. A high optical signal-to-noise ratio of over 60 dB for almost all the tunable range is also obtained.
We demonstrate time-dependent polarization shaping with no ambiguity of femtosecond laser pulses using a reflective-type two-dimensional spatial light modulator, which can independently control the orthogonal phase and amplitude.
We generate a train of highly-stable ultrashort-pulses with a repetition-rate of 10.6 THz by synthesizing phase-coherent rotational-Raman-sidebands in para-hydrogen. We show full characterization of its temporal waveform based on a frequency-resolved-optical-gating method.
Summary form only given. We have demonstrated DUV pulses generated by non-degenerate four-wave mixing through filamentation in neon gas. The pulse energy easily reaches ten micro joule order or more. The generated spectra, centered at 267 nm and 200 nm, are broad enough to be 10-fs pulses. The 267 nm pulses were compressed down to 13 fs by a single-pass grating compressor and characterized by TG-FROG...
Near infrared emission with a bandwidth more than 450 nm which should be useful for ultra broadband optical amplifiers and tunable lasers for optical telecommunication, has been observed from Bi-doped lithium alumino silicate glass.
An optical method for evaluating the strength of general industrial products is proposed in this paper. In the method, a levitated mass encountering negligible friction is made to collide with a general industrial product under test. During the collision, the Doppler frequency shift of a laser beam reflecting from the mass is accurately measured using an optical interferometer. The velocity, position,...
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