K. Midorikawa, Y. Nagata, DiMaruro et al., "Spectroscopic investigations of an optical-field-ionized X-ray laser with a microcapillary target," Applications of High Field and Short Wavelength Sources, pp. 65-69, 1998.

K. Sugioka, "Report on the SPIE international symposium on LASE'98," J. Jpn. Soc. Laser Tech., vol. 23, no. 2, pp. 29-32, 1998(in Japanese).

K. Sugioka, Zhang Jie, S. Wada, H. Tashiro, and K. Toyoda, "Novel ablation of wide band-gap materials by multiwavelength excitation using a VUV-UV laser system," Nanotechnology, vol. 9, pp. 99-103, 1998.

A. Suda, Kien Fam　Le, and K. Midorikawa, "Attosecond pulse generation using high-order harmonics," Reports on Topical Meeting of the Laser Society of Japan, pp. 15-19, 1998(in Japanese).

H. Kumagai, "Novel soft X-ray multilayer mirrors through atomic layer deposition/epitaxy methods," HIKARI RYOSHI DEVICE KENKYUKAI SHIRYO, pp. 11-16, 1998(in Japanese).

K. Midorikawa and Y. Nagata, "Coherent soft X-Ray generation by subpicosecond, high intensity KrF laser pulses," J. Korean Phys. Soc., vol. 33, pp. 223-227, 1998.

K. Sugioka, S. Wada, and H. Tashiro, "Vaccum-ultra violet Raman laser and application to multiwavelength excitation process," Optronics, vol. 193, pp. 98-105, 1998(in Japanese).

K. Sugioka, Zhang Jie, S. Wada, H. Tashiro, K. Midorikawa, and K. Toyoda, "Precise microfabrication of wide band gap materials by VUV-UV multiwavelength ablation," Proc. SPIE-Int. Soc. Opt. Eng., vol. 3274, pp. 44-52, 1998.

Xu Shifa, Du Liren, K. Sugioka, K. Toyoda, and M. Jyumonji, "Preferred growth of epitaxial TiN thin film on silicon substrate by pulsed laser deposition," J. Mater. Sci.: Mater. Med., vol. 33, pp. 1777-1782, 1998.

K. Sugioka, Zhang Jie, S. Wada, H. Tashiro, and K. Midorikawa, "Precision laser ablation of wide band-gap materials using VUV-UV multiwavelength excitation," Proc. SPIE-Int. Soc. Opt. Eng., vol. 3683, pp. 108-117, 1998.

W. Sasaki and K. Sugioka, "Next generation processes by extremely short wavelength beams," OYO BUTURI, vol. 67, pp. 86-86, 1998(in Japanese).

K. Adachi, T. Ezaki, M. Obara, H. Kumagai, and K. Midorikawa, "Fabrication of waveguide laser crystals by laser ablation method:Toward the fabrication of laser crystals on Si substrates," The Review of Laser Engineering, vol. 26, pp. 415-420, 1998(in Japanese).

T. Hazegawa, K. Adachi, Y. Fukaya, M. Obara, H. Kumagai, and K. Midorikawa, "Fabrication of Cr⁴⁺: YAG and Yb³⁺: YAG optical waveguides by pulsed laser deposition," IEICE Tech. Rep., no. 16, pp. 7-12, 1998(in Japanese).

H. Kumagai, H. Matsuyama, Y. Iimura, K. Midorikawa, and M. Obara, "Development of soft x-ray multilayer mirrors for Water-Window" wavelengths through atomic layer control"," IEICE Tech. Rep., no. 19, pp. 25-30, 1998(in Japanese).

Kien Fam Le, K. Midorikawa, and A. Suda, "Attosecond pulse generation using high harmonics in the multicycle regime of the driver pulse," Phys. Rev. A, vol. 58, pp. 3311-3319, 1998.

Zhang Jie, K. Sugioka, S. Wada, H. Tashiro, and K. Midorikawa, "Study on high-speed deep etching of GaN film by UV laser ablation," Phys. Rev. A, vol. 189/190, pp. 725-729, 1998.

K. Mori, Y. Tamaki, M. Obara, and K. Midorikawa, "Second-harmonic generation of femtosecond high-intensity Ti:sapphire laser pulses," J. Appl. Phys., vol. 83, pp. 2915-2919, 1998.

Zhang Jie, K. Sugioka, and K. Midorikawa, "Direct fabrication of microgratings in fused quartz by laser-induced plasma-assisted ablation with a KrF excimer laser," Opt. Lett., vol. 23, pp. 1486-1488, 1998.

Zhang Jie, K. Sugioka, S. Wada, H. Tashiro, K. Toyoda, and K. Midorikawa, "Precise microfabrication of wide band gap semiconductors (SiC and GaN) by VUV-UV multiwavelength laser ablation," Appl. Surf. Sci., vol. 127/129, pp. 793-799, 1998.

K. Sugioka, Zhang Jie, Ruschin Schlomo, S. Wada, H. Tashiro, and K. Toyoda, "Vacuum-ultraviolet laser-induced refractive index change of fused silica," Appl. Surf. Sci., vol. 127/129, pp. 843-847, 1998.

Kien Fam　Le, K. Midorikawa, and A. Suda, "VAttosecond pulse generation using high harmonics of the KrF laser driver pulse," Jpn. J. Appl. Phys. Pt.2, vol. 37, pp. L733-L736, 1998.

Cho Sung-Hak, H. Kumagai, I. Yokota, K. Midorikawa, and M. Obara, "Observation of self-channeled plasma formation and bulk modification in optical fibers using high-intensity femtosecond laser," Jpn. J. Appl. Phys. Pt.2, vol. 37, pp. L737-L739, 1998.

Y. Tamaki, M. Obara, and K. Midorikawa, "Second-harmonic generation from intense, 100-fs Ti:sapphire laser pulses in potassium dihydrogen phosphate, cesium lithium borate and b-barium metaborate," Jpn. J. Appl. Phys. Pt.1, vol. 37, pp. 4801-4805, 1998.

Zhang Jie, K. Sugioka, and K. Midorikawa, "Laser-induced plasma-assisted ablation of fused quartz using the fourth harmonic of a Nd⁺:YAG laser," Appl. Phys. A, vol. 67, pp. 545-549, 1998.

Zhang Jie, K. Sugioka, and K. Midorikawa, "High-speed machining of glass materials by laser-induced plasma-assisted ablation using a 532-nm laser," Appl. Phys. A, vol. 67, pp. 499-501, 1998.

Y. Tamaki, K. Midorikawa, and M. Obara, "Phase-matched third-harmonic generation by nonlinear phase shift in a hollow fiber," Appl. Phys. B, vol. 67, pp. 59-63, 1998.