Miniaturized, high-power diode-pumped, Q-switched Nd:YAG laser oscillator-amplifier.

A miniaturized, passively Q-switched Nd:YAG laser oscillator-power amplifier is reported, which is axially pumped by a compact, fiber-coupled, high-power, quasi-cw diode laser module. The pumping intensity of the oscillator crystal can be adjusted independently of the pumping intensity of the amplifier. This ensures that the oscillator pulse enters the amplifier when its maximum population density is reached. Furthermore, pulse bursts can be generated with a definite, adjustable number of single pulses. Maximum pulse energies of 8.4 and 22 mJ were achieved for a single pulse and for a pulse burst, respectively, at a pumping power of 470 W. The pulse widths were 2 ns, whereas the beam quality corresponded to M2<1.5. The laser is appropriate for scaling the power to the 10 MW range. Operation by using a 100 m pumping fiber was demonstrated.

[1]  Wolfgang Schade,et al.  Pulsed laser surface fragmentation and mid-infrared laser spectroscopy for remote detection of explosives , 2006 .

[2]  P. Russell.  Photonic Crystal Fibers , 2003, Science.

[3]  H. Löhmannsröben,et al.  Application of laser-based ion mobility (IM) spectrometry for the analysis of polycyclic aromatic compounds (PAC) and petroleum products in soils. , 2003, Journal of environmental monitoring : JEM.

[4]  Binh T. Do,et al.  Power scaling of fiber-based amplifiers seeded with microchip lasers , 2008, SPIE LASE.

[5]  B. Köhler,et al.  High-power, longitudinally fiber-pumped, passively Q-switched Nd:YAG oscillator-amplifier. , 2006, Optics letters.

[6]  Energy-scavenging amplifiers for miniature solid-state lasers. , 2004 .

[7]  J. Rothhardt,et al.  Extended single-mode photonic crystal fiber lasers. , 2006, Optics express.

[8]  Jörg Neumann,et al.  High efficiency passively Q-switched Nd:YAG MOPA for spaceborne laser-altimetry , 2006, SPIE LASE.

[9]  Fabio Di Teodoro,et al.  1-mJ energy, 1-MW peak-power, 10-W average-power, spectrally narrow, diffraction-limited pulses from a photonic-crystal fiber amplifier. , 2005, Optics express.

[10]  Kai-Hsiu Liao,et al.  High Peak Power Pulse Amplification in Large-Core Yb-Doped Fiber Amplifiers , 2007, IEEE Journal of Selected Topics in Quantum Electronics.

[11]  Fabio Di Teodoro,et al.  Diffraction-limited, 300-kW peak-power pulses from a coiled multimode fiber amplifier. , 2002, Optics letters.

[12]  T. A. King,et al.  Compact all-solid-state high repetition rate tunable ultraviolet source for airborne atmospheric gas sensing , 2000 .

[13]  J. Streicher,et al.  A diode-pumped Nd: YAG lidar for airborne cloud measurements , 1993 .

[14]  Arlee V Smith,et al.  Peak-power limits on fiber amplifiers imposed by self-focusing. , 2006, Optics letters.