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  • Single Longitudinal Mode Blue-Violet Laser Diode for Data Storage
    blue-violet laser diode source with a long coherence length and some level of wavelength tuning. Prior approaches, such as external cavities with diffraction gratings [1], have been used to generate single longitudinal mode tunable lasers near 405 nm. Such cavities require a very low reflectivity
  • High-Performance Wavelength-Locked Diode Lasers (.pdf)
    . 2. VHG LOCKED DIODE LASERS. The optical lasing spectra of quantum well semiconductor lasers are closely related to the optical gain spectrum of the. active region. Standard broad area diode lasers do not employ wavelength-selective feedback or longitudinal mode. suppression mechanisms, resulting
  • Lasers Utilized to Perform Controlled Mechanical Bending
    . -. Surface buckling generates a longitudinal elongation in the heat affected zone. during laser heating which causes the tube to bend in the direction of the moving. laser. -. Height of the bulged surface increases with the laser power for the same scanned. speed. -. Bending angle oscillated significantly
  • Fiber Laser Welding of 100µm Thick Stainless Steel
    weld surfaces have been related to. examination. Transverse diametral cross-sections. excellent porosity-free welds. of several welds from each parameter setting. were prepared using conventional metallurgical. techniques. Figure 1 shows a transverse cross-sections and. figure 2 shows a longitudinal
  • A Novel Tunable Diode Laser Using Volume Holographic Gratings (.pdf)
    We have developed a self-aligned external cavity laser with a non-dispersive volume holographic grating (VHG) as the output coupler. The resulting external cavity is tunable by rotating the VHG. We have demonstrated tunable single mode longitudinal operation at 405 nm and 785 nm wavelength
  • Power Stabilization of the Dual-Mode Laser Using Volume Holographic Gratings (.pdf)
    mirrors. and. . The laser action in the counter-clockwise direction was. suppressed by a Faraday rotator acting as an isolator. The Ti:Sapphire ring cavity laser had a very wideband. gain profile and had many longitudinal modes. The sinusoidal. throughput of the birefringent filter, however, favored
  • Comparison of diode-side-pumped
    output, changed to a slab or disc concept. In the design of. the slab the generated laser radiation can be directed along longitudinal axes of the active medium or along the. "zig-zag" path ­ the laser beam traverses the slab using total internal reflection from the slab side faces.2, 3 All
  • Raman Spectroscopy
    focused with a stable spatial beam. More advanced systems require lasers to exhibit narrow frequency bands so that better resolutions can be reached and for this single longitudinal mode lasers are preferred. Popular wavelengths include 1064nm, 785nm and 532nm. There is also considerable interest

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