Acousto-optic

Caruso F, Jory M J, Bradberry G W, Sambies J R and Furiong D N 1998 Acousto-optic surface-piasmon resonance measurements of thin fiims on goid J. AppL Rhys. 83 1023-8... 

Figure B2.1.1 Femtosecond light source based on an amplified titanium-sapphire laser and an optical parametric amplifier. Symbols used P, Brewster dispersing prism X, titanium-sapphire crystal OC, output coupler B, acousto-optic pulse selector (Bragg cell) FR, Faraday rotator and polarizer assembly DG, diffraction grating BBO, p-barium borate nonlinear crystal.

Dugan M A, Tull J X and Warren W S 1997 High-resolution acousto-optic shaping of unamplified and amplified femtosecond laser pulses J. Opt. Soc. Am. B 14 2348-58... 

Acousto-optic Filters. The newest type of spectrometer to become commercially available is the acousto-optic tunable filter (AOTF). An AOTF is a sohd-state, electronically tunable bandpass filter based on the diffraction of optical waves by acoustic waves in an optically anisotropic crystal. 

Fig. 2. Stmctures of acousto-optic tunable filters (a) collinear and (b) noncollinear.

The 6 Nd YAG lasers pump the DM0, preamplifier and power amplifier (Fig. 19, Friedman et al., 1998). The YAG lasers are built from commercially available flashlamp/laser rod assemblies, acousto-optic Q-switches and frequency doubling crystals (LBO and KTP). Most of the mirror mounts and crystal holders are commercial. Nd YAGs are frequency doubled to 532 nm using a nonlinear crystal. The Nd YAG rod and nonlinear crystal are both in the pump laser cavity to provide efficient frequency conversion. The 532 nm light is coupled out through a dichroic and fed to multimode fibers which transport the light to the DM0 and amplifier dye cells. 

Figure 27. Layout of the cavity of the modeless oscillator. The acousto-optics frequency shifter prevents inlerrerenccs in the cavity, resulting in a bixuid coiiliu-uons spectral profile (Pique and Faiinotti, 2003).

Huang, Z., Munro N., Huhmer, A.F.R., and Landers, J.P, Acousto-optical deflection-based laser beam scanning for fluorescence detection on multichannel electrophoretic microchips, Anal. Chem. 71, 5309, 1999. 

Accelerator mass spectrometry Acousto-optical tuneable filter Acousto-optical tuneable spectrometer/scanning Atom probe... 

Acousto-Optic Signal Processing Theory and Implementation, edited by Norman J. Berg and John N. Lee... 

Electro-Optic and Acousto-Optic Scanning and Deflection, Milton Gottlieb, Clive L. M. Ireland, and John Martin Ley... 

Design and Fabrication of Acousto-Optic Devices, edited by Akis P. Goutzoulis and Dennis R. Pape... 

Acousto-Optics Second Edition, Adrian Korpel... 

In frequency-domain FLIM, the optics and detection system (MCP image intensifier and slow scan CCD camera) are similar to that of time-domain FLIM, except for the light source, which consists of a CW laser and an acousto-optical modulator instead of a pulsed laser. The principle of lifetime measurement is the same as that described in Chapter 6 (Section 6.2.3.1). The phase shift and modulation depth are measured relative to a known fluorescence standard or to scattering of the excitation light. There are two possible modes of detection heterodyne and homodyne detection. 

P. J. Treado, I. W. Levin, and E. N. Lewis, Near-infrared acousto-optic filtered spectroscopic microscopy A solid-state approach to chemical, Imaging. Appl. Sped. 46, 553-559 (1991). 

Figure 9.12. Block diagrams of fiberoptic sensing instrumentation Top externally modulated laser with an acousto-optic modulator. (From Ref. 20 with permission.) Bottom internally modulated laser, (From Ref. 21 with permission.)...

However, unlike diode lasers, an external acousto-optic or electro-optic modulator is required for phase-modulation lifetime fluorometry to be performed with a HeNe laser. 

Because NIR was initially used for food and agriculture products, it has evolved as a technique for complex matrices. Many types of hardware have become available for NIR work interference filters, gratings, interferometers, diode arrays, and acousto-optic tunable filters. And, as it was originally developed for complex mixtures, chemometrics has been an integral part of any NIR analysis for the last few decades. NIR practitioners are quite comfortable with multivariate equations and development of equations for complex matrices. 

The acousto-optic tunable filter (AOTF) analyzer... 

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