Applied Optics

Femtosecond off-axis digital holography for monitoring dynamic surface deformation

Linwei Zhu, Changhe Zhou, Tengfei Wu, Wei Jia, Zhongwei Fan, Yunfeng Ma, Gang Niu
We present a femtosecond off-axis digital holography for investigating the dynamic reversible surface change of a metal film induced by femtosecond laser pulses with fluences near the ablation threshold. A reflection Michelson interferometer (RMI) and a transmission Mach–Zehnder ... [Appl. Opt. 49, 2510-2518 (2010)]

North American Symposium on Laser-Induced Breakdown Spectroscopy: introduction to the feature issue

Jagdish P. Singh, Jose R. Almirall, Steven J. Rehse
This feature issue highlights the topics presented at the 2009 North American Symposium on Laser-Induced Breakdown Spectroscopy, in New Orleans, Louisiana, held 13–15 July 2009. [Appl. Opt. 49, LIBS1-LIBS2 (2010)]

Propagation properties of a Lorentz beam array

Pu Zhou, Xiaolin Wang, Yanxing Ma, Zejin Liu
A Lorentz beam array presents a good model to study a coherent diode laser array, which is an efficient radiation source for high-power beaming use. We present a detailed study of the propagation properties of a Lorentz beam array. Closed-form intensity distribution in the spatial frequency domain ... [Appl. Opt. 49, 2497-2503 (2010)]

Calibrating the ChemCam laser-induced breakdown spectroscopy instrument for carbonate minerals on Mars

Nina L. Lanza, Roger C. Wiens, Samuel M. Clegg, Ann M. Ollila, Seth D. Humphries, Horton E. Newsom, James E. Barefield
The ChemCam instrument suite onboard the NASA Mars Science Laboratory rover includes the first laser-induced breakdown spectroscopy (LIBS) instrument for extraterrestrial applications. Here we examine carbonate minerals in a simulated martian environment to better understand the LIBS signature of ... [Appl. Opt. 49, C211-C217 (2010)]

Shack–Hartmann centroid detection method based on high dynamic range imaging and normalization techniques

Javier Vargas, Luis González-Fernandez, Juan Antonio Quiroga, Tomás Belenguer
In the optical quality measuring process of an optical system, including diamond-turning components, the use of a laser light source can produce an undesirable speckle effect in a Shack–Hartmann (SH) CCD sensor. This speckle noise can deteriorate the precision and accuracy of the wavefront ... [Appl. Opt. 49, 2409-2416 (2010)]

Effect of laser linewidth and fiber length on self-pulsing dynamics and output stabilization of single-mode Yb-doped double-clad fiber laser

Brahma�N. Upadhyaya, Antony Kuruvilla, Usha Chakravarty, Mangalpady�R. Shenoy, Krishna Thyagarajan, Shrikant�M. Oak
We report an experimental study of the effect of fiber length and laser linewidth on self-pulsing dynamics and output stabilization of a single-mode Yb-doped double-clad CW fiber laser. It is found that initiation of self-pulsing under low-level pumping conditions is due to relaxation oscillations ... [Appl. Opt. 49, 2316-2325 (2010)]

Numerical analysis of diameter influence on droplet fluorescence

Bruno Frackowiak, Cameron Tropea
Laser-induced fluorescence (LIF) is used in planar droplet sizing, assuming that the signal integrated over the droplet is proportional to its volume. Nevertheless, this assumption is rigorously valid in nonabsorbing mixtures. We performed an examination of the LIF signal with a fluorescence model, ... [Appl. Opt. 49, 2363-2370 (2010)]

Application of laser photofragmentation-resonance enhanced multiphoton ionization to ion mobility spectrometry

Jeffrey M. Headrick, Thomas A. Reichardt, Thomas B. Settersten, Ray P. Bambha, Dahv A. V. Kliner
We demonstrate detection of nitro-containing compounds with laser photofragmentation (PF) coupled with resonance enhanced multiphoton ionization (REMPI) and ion mobility spectrometry (IMS). In PF-REMPI, a laser dissociates the parent molecules, producing fragments that can then be ionized by ... [Appl. Opt. 49, 2204-2214 (2010)]

High-spatiotemporal-quality petawatt-class laser system

Hiromitsu Kiriyama, Mori Michiaki, Yoshiki Nakai, Takuya Shimomura, Hajime Sasao, Momoko Tanaka, Yoshihiro Ochi, Manabu Tanoue, Hajime Okada, Shuji Kondo, Shuhei Kanazawa, Akito Sagisaka, Izuru Daito, Daisuke Wakai, Fumitaka Sasao, Masayuki Suzuki, Hideyuki Kotakai, Kiminori Kondo, Akira Sugiyama, Sergei Bulanov, Paul R. Bolton, Hiroyuki Daido, Shunichi Kawanishi, John L. Collier, Cristina Hernandez-Gomez, Chris J. Hooker, Klaus Ertel, Toyoaki Kimura, Toshiki Tajima
We have developed a femtosecond high-intensity laser system that combines both Ti:sapphire chirped-pulse amplification (CPA) and optical parametric CPA (OPCPA) techniques and produces more than 30 J broadband output energy, indicating the potential for achieving peak powers in excess of 500 TW. ... [Appl. Opt. 49, 2105-2115 (2010)]

Phase errors due to speckles in laser fringe projection

Sara Rosendahl, Emil Hällstig, Per Gren, Mikael Sjödahl
When measuring a three-dimensional shape with triangulation and projected interference fringes it is of interest to reduce speckle contrast without destroying the coherence of the projected light. A moving aperture is used to suppress the speckles and thereby reduce the phase error in the fringe ... [Appl. Opt. 49, 2047-2053 (2010)]

Syndicate content