Virtual Journal of Laser

Laser wakefield electron acceleration for γ-ray radiography application

Sun, 10 Jun 2012 00:00:00 +0000

Yuchi Wu, Zongqing Zhao, Bin Zhu, Kegong Dong, Xianlun Wen, Yingling He, Yuqiu Gu, Baohan Zhang
An electron beam is obtained using laser wakefield electron accelerator, and
converted into a γ-ray source after undergoing bremsstrahlung radiation in a
dense material. A quasi-monoenergetic structure is observed when the length of the
... [Chin. Opt. Lett. 10, 063501- (2012)]

Enhanced photocatalytic activity of TiO_2 thin film coating on microstructured silicon substrate

Sun, 10 Jun 2012 00:00:00 +0000

Liwei Yang, Yulan Wang, Li Zhao
Photocatalytic TiO_2 thin film is prepared by sol-gel technique on
microstructured silicon substrate produced by femtosecond laser cumulative
irradiation. The photocatalytic activity is evaluated by the degradation of
methylene blue (MB) solution ... [Chin. Opt. Lett. 10, 063102- (2012)]

Method to identify time delay of chaotic semiconductor laser with optical feedback

Sun, 10 Jun 2012 00:00:00 +0000

Yuanyuan Guo, Yuan Wu, Yuncai Wang
We propose a power spectrum analysis method to directly identify the time
delay of a chaotic semiconductor laser with optical feedback. By measuring the radio
frequency (RF) power spectrum of the chaotic laser and performing an inverse Fourier
... [Chin. Opt. Lett. 10, 061901- (2012)]

Small signal gain and loss measurement of a CW Nd:YAG laser using an antiresonant ring interferometer

Sun, 10 Jun 2012 00:00:00 +0000

Saeed Ghavami Sabouri, Alireza Khorsandi
An antiresonant ring (ARR) interferometer configuration is introduced for the
characterization of a continuous wave (CW) Nd:YAG laser output. The output of the
ARR device is precisely characterized to determine the gain and loss of a laboratory
CW ... [Chin. Opt. Lett. 10, 061405- (2012)]

Quantum limit in low-loss ring laser gyros

Sun, 10 Jun 2012 00:00:00 +0000

Zhiguo Wang, Xingwu Long, Fei Wang
Contrary to expectations, a measurement of the random walk in the ring laser
gyro (RLG) as a function of laser power P shows that it is not consistent with the
P^1/2 rule. In the experiment, the random walk and laser power are tested and
recorded ... [Chin. Opt. Lett. 10, 061404- (2012)]

Dynamic lock-in compensation for mechanically dithered ring laser gyros

Sun, 10 Jun 2012 00:00:00 +0000

Zhenfang Fan, Hui Luo, Guangfeng Lu, Shaomin Hu
In ring laser gyros (RLGs), dynamic lock-in, which results from information
loss in the lock-in region, occurs when a constant sine bias is introduced. However,
sampling some signals in the lock-in region for a particular duration allows the
... [Chin. Opt. Lett. 10, 061403- (2012)]

High-efficiency hybrid brillouin/ytterbium fiber laser

Sun, 10 Jun 2012 00:00:00 +0000

Peng Zhang, Youen Jiang, Wei Wang, Xuechun Li
A high-efficiency hybrid Brillouin/ytterbium fiber laser (BYFL) is
demonstrated using a 41.5-cm-long highly ytterbium-doped fiber and a 10-m-long
single-mode optical fiber. The BYFL operates at 1 052.92 nm, and the difference
between it and the ... [Chin. Opt. Lett. 10, 061402- (2012)]

Large spot size and low-divergence angle operation of 917-nm edge-emitting semiconductor laser with an asymmetric waveguide structure

Sun, 10 Jun 2012 00:00:00 +0000

Jianxin Zhang, Lei Liu, Wei Chen, Anjin Liu, Wenjun Zhou, Wanhua Zheng
GaInAs/AlGaAs comprehensive-strained three-quantum-well lasers with
asymmetric waveguide are designed and optimized. With this design, the optical field
in the transverse direction is extended, and a semiconductor laser with large spot
is obtained. ... [Chin. Opt. Lett. 10, 061401- (2012)]

Co-registration method for photoacoustic imaging and laser speckle imaging

Sun, 10 Jun 2012 00:00:00 +0000

Yuan Gao, Yong Deng, Xiliang Tong, Hui Wang, Zilin Deng, Xiaoquan Yang, Yanyan Liu, Hui Gong, Qingming Luo
Combining photoacoustic (PA) imaging with laser speckle (LS) imaging (LSI)
can simultaneously determine total hemoglobin concentration (HbT), hemoglobin oxygen
saturation (SO2), and blood flow rates. Thus, the co-registration of PA and LS
images is ... [Chin. Opt. Lett. 10, 061101- (2012)]

Aligning a reflection cavity by Anderson’s method