2.70 μm CrEr: YSGG laser with high output energy and FTIR-Q-switch

Abstract We report on efficient operation of a flashlamp pumped CrEr: YSGG laser at the wavelength of 2.70 μm. A free running output pulse energy of more than 0.6 J at a slope efficiency of 0.36% has been achieved by using a specially-designed low-loss dispersive resonator. We will also report on efficient frustrated total internal reflection (FTIR) Q-switching of this laser. The wavelength of 2.70 μm is of particular interest for laser surgery because of its considerably better transmittance in fused silica fibers compared to well developed 2.79 μm CrEr: YSGG and 2.94 μm Er: YAG lasers.

[1]  V. Romano,et al.  A comparative study of laser tissue interaction at 2.94 μm and 10.6 μm , 1988 .

[2]  A. M. Prokhorov,et al.  ARTICLES: Spectral, luminescence, and lasing properties of a yttrium scandium gallium garnet crystal activated with chromium and erbium , 1986 .

[3]  T J Flotte,et al.  Er:YAG laser ablation of tissue: Effect of pulse duration and tissue type on thermal damage , 1989, Lasers in surgery and medicine.

[4]  Ian N. Court,et al.  Frustrated Total Internal Reflection and Application of Its Principle to Laser Cavity Design , 1964 .

[5]  Martin Frenz,et al.  Active and passive Q-switching of a 2.79 μm Er: Cr: YSGG laser , 1993 .

[6]  Heinz P. Weber,et al.  150 mW unsaturated output power at 3 µm from a single-mode-fiber erbium cascade laser , 1995 .

[7]  V. Lupei,et al.  On the dynamics of population inversion for 3 mu m Er/sup 3+/ lasers , 1993 .

[8]  M. Robinson,et al.  THERMAL SWITCHING OF LASER EMISSION OF Er3+ AT 2.69 μ AND Tm3+ AT 1.86 μ IN MIXED CRYSTALS OF CaF2:ErF3:TmF3 , 1967 .

[9]  H Lubatschowski,et al.  Q‐switched CTE:YAG (2.69 μm) laser ablation: Basic investigations on soft (corneal) and hard (dental) tissues , 1993 .

[10]  V. Fedorov,et al.  Absorption, luminescence, and stimulated emission investigations in Lu3Al5O12-Er3+ Crystals , 1977 .

[11]  F. Auzel,et al.  Multifrequency room‐temperature continuous diode and Ar* laser‐pumped Er3+ laser emission between 2.66 and 2.85 μm , 1989 .

[12]  Günter Huber,et al.  Laser pumping of Ho-, Tm-, Er-doped garnet lasers at room temperature , 1988 .

[13]  M. Birnbaum,et al.  Upconversion‐pumped 2.8–2.9‐μm lasing of Er3+ ion in garnets , 1991 .