Britten, J.

The dispenser's vade-mecum. Being a dictionary of the words used by physicians in prescribing. An interpreter of abbreviated words and sentences, and an expositor of the roots of inflected Latin words by J Britten ( Book )
2 editions published between 1857 and 1863 in English and held by 3 libraries worldwide

Precision damage tests of multilayer dielectric gratings for high-energy petawatt lasers ( Book )
1 edition published in 2004 in English and held by 2 libraries worldwide
The next generation of high-energy petawatt (HEPW)-class lasers will utilize multilayer dielectric diffraction gratings for pulse compression due to their high efficiency and high damage threshold for picosecond pulses. We have developed a short-pulse damage test station for accurate determination of the damage threshold of the optics used on future HEPW lasers. The design and performance of the damage test laser source, based on a highly stable, high-beam-quality optical parametric chirped-pulse amplifier, is presented. Our short-pulse damage measurement methodology and results are discussed. The damage initiation is attributed to multiphoton-induced avalanche ionization, strongly dependent on the electric field enhancement in the grating groove structure and surface defects. Measurement results of the dependence of damage threshold on the pulse width, angular dependence of damage threshold of diffraction gratings, and an investigation of short-pulse conditioning effects are presented. We report record >4 J/cm{sup 2} right section surface damage thresholds obtained on multilayer dielectric diffraction gratings at 76.5 incidence angles for 10-ps pulses.

Design and Test of Advanced Multi-Layer Dielectric Gratings for High Energy Petawatt ( Book )
1 edition published in 2003 in English and held by 2 libraries worldwide
In this paper we discuss recent work on the development of high damage threshold, high efficiency MLD (multilayer dielectric) diffraction gratings for use in high energy, petawatt laser systems. This effort involves a close integration between modeling, fabrication, and testing. The modeling work is used to identify grating designs that satisfy the constraints of high efficiency (>94%) and low field enhancement which is a necessary condition for high damage threshold. Subscale MLD gratings for test are being fabricated in an advanced ion-etch machine we have recently built. The testing effort is being conducted in a dedicated laboratory. The laser beam used to test the samples is based on an OPCPA (optical parametric chirped-pulse amplifier) and a compressor that can provide pulse energies up to 50mJ with pulse lengths variable from 0.3-20 ps. This test station is equipped with diagnostics to fully characterize both the spatial and temporal characteristics of the test beam at the plane of the sample. Initial results have demonstrated a dependence of damage threshold on incident angle that is in good agreement with the field enhancement calculations. We have demonstrated a grating design with a damage threshold of 3J/cm{sup 2} and are investigating manufacturability and reproducibility issues as well.

Short-pulse Laser Capability on the Mercury Laser System ( Book )
1 edition published in 2006 in English and held by 2 libraries worldwide
Applications using high energy ''petawatt-class'' laser drivers operating at repetition rates beyond 0.01 Hz are only now being envisioned. The Mercury laser system is designed to operate at 100 J/pulse at 10 Hz. We investigate the potential of configuring the Mercury laser to produce a rep-rated, ''petawatt-class'' source. The Mercury laser is a prototype of a high energy, high repetition rate source (100 J, 10 Hz). The design of the Mercury laser is based on the ability to scale in energy through scaling in aperture. Mercury is one of several 100 J, high repetition rate (10 Hz) lasers sources currently under development (HALNA, LUCIA, POLARIS). We examine the possibility of using Mercury as a pump source for a high irradiance ''petawatt-class'' source: either as a pump laser for an average power Ti:Sapphire laser, or as a pump laser for OPCPA based on YCa{sub 4}O(BO{sub 3}){sub 3} (YCOB), ideally producing a source approaching 30 J /30 fs /10 Hz--a high repetition rate petawatt. A comparison of the two systems with nominal configurations and efficiencies is shown in Table 1.

The plants of Milanji, Nyasa-Land ( Book )
1 edition published in 1894 in English and held by 1 library worldwide

Non-sewered sanitation for housing and institutional buildings ( Book )
1 edition published in 1992 in English and held by 1 library worldwide

Land and the rate of interest by J Britten ( Book )
1 edition published in 1862 in English and held by 1 library worldwide

International treaty reform by J Britten ( Book )
1 edition published in 1860 in English and held by 1 library worldwide

The plants of Milanji, Nyassa-land by J Britten ( Book )
1 edition published in 1893 in English and held by 1 library worldwide

The Sloan herbarium : an annotated list of the Horti Sicci composing it, with biological accounts of the principal contributors by J Britten ( Visual )
1 edition published in 1968 and held by 1 library worldwide