Virtual Journal of Laser

Andrew J. Lee, Jipeng Lin, Helen M. Pask
We report the first cw intracavity crystalline Raman laser operating at the second-Stokes wavelength. Approximately 950mW emission is obtained at 1308nm from a Nd:GdVO_4 self-Raman laser, with an overall (diode to 1308nm) conversion efficiency of 6.8%. By intracavity sum-frequency mixing the first- ... [Opt. Lett. 35, 3000-3002 (2010)]

Jae Hee Sung, Seong Ku Lee, Tae Jun Yu, Tae Moon Jeong, Jongmin Lee
We report on the generation of 1.0PW, 30fs laser pulses at a 0.1Hz repetition rate from a chirped-pulse amplification Ti:sapphire laser system. The energy of the laser pulses is amplified up to 47J in a final three-pass booster amplifier having 96J pump energy. To the best of our knowledge, this is ... [Opt. Lett. 35, 3021-3023 (2010)]

A. A. Lagatsky, X. Han, M. D. Serrano, C. Cascales, C. Zaldo, S. Calvez, M. D. Dawson, J. A. Gupta, C. T. A. Brown, W. Sibbett
We report, for the first time to our knowledge, femtosecond-pulse operation of a Tm,Ho:NaY(WO_4)_2 laser at around 2060nm. Transform-limited 191fs pulses are produced with an average output power of 82mW at a 144MHz pulse repetition frequency. Maximum output power of up to 155mW is generated with a ... [Opt. Lett. 35, 3027-3029 (2010)]

Edward D. Farnum, J. Nathan Kutz
We propose a model that is valid for ultrafast pulse propagation in a mode-locked laser cavity in the few-femtosecond pulse regime, thus deriving the equivalent of the master mode-locking equation for ultrashort pulses that has dominated mode-locking theory for two decades. The short-pulse equation ... [Opt. Lett. 35, 3033-3035 (2010)]

Frithjof Haxsen, Dieter Wandt, Uwe Morgner, Joerg Neumann, Dietmar Kracht
We report on chirped-pulse amplification of an ultrafast thulium-doped fiber laser. Pulses with an energy of 3.3nJ and a bandwidth-limited pulse duration of 195fs could be amplified to 151nJ, which corresponds to an average power of 5.7W at 37.6MHz pulse repetition rate. The maximum output power ... [Opt. Lett. 35, 2991-2993 (2010)]

Ravitej Uppu, Sushil Mujumdar
We report on intensity fluctuations of a coherent random laser based on incoherent feedback via nonresonant multiple scattering. We quantify the spectral line shape fluctuations in terms of correlations of an individual spectrum with the ensemble-averaged spectrum, which infers the signature of the ... [Opt. Lett. 35, 2831-2833 (2010)]

Walter Lubeigt, Gerald M. Bonner, Jennifer E. Hastie, Martin D. Dawson, David Burns, Alan J. Kemp
Continuous-wave operation of a diamond Raman laser is demonstrated. Low-birefringence synthetic single-crystal diamond is used and is intracavity pumped by a Nd:YVO_4 laser. A cw output power of 200mW is achieved at the Raman wavelength (1240nm), and 1.6W of on-time output power is obtained in ... [Opt. Lett. 35, 2994-2996 (2010)]

Guangmin Ouyang, Zhaomin Tong, M. Nadeem Akram, Kaiying Wang, Vladimir Kartashov, Xin Yan, Xuyuan Chen
Speckle reduction by moving diffuser has been previously studied in display systems with coherent light sources, such as lasers. In this Letter, we propose a motionless diffractive optical element (DOE) for speckle reduction. The DOE was designed based on finite-element method simulations, ... [Opt. Lett. 35, 2852-2854 (2010)]

Jonathan D. Suter, Wonsuk Lee, Daniel J. Howard, Eric Hoppmann, Ian M. White, Xudong Fan
Optofluidic lasers are of particular interest for lab-on-a-chip-type devices, with broad spectral tunability, convenient microfluidic integration, and a small footprint. Optofluidic ring resonator (OFRR) lasers are advantageous in terms of size but typically generate nondirectional emission that is ... [Opt. Lett. 35, 2997-2999 (2010)]

Hong Cai, Andrew W. Poon
We demonstrate optical manipulation and transport of 1μm sized polystyrene particles on silicon nitride microring-resonator-based add–drop devices in an integrated optofluidic chip. By tuning the input laser wavelength and upon certain resonance quality factors, we observe ... [Opt. Lett. 35, 2855-2857 (2010)]