Acousto optic modulator book

An aom consists of a piezoelectric transducer pzt bonded to an optical medium glass or crystalline. In our experiment, the acoustooptic interaction length of the aom designed primarily for operation in such a mode was 2 mm. Part i operation of the acousto optic modulator simple analysis of acousto optic deflection. An acousto optic modulator aom is a device which can be used for controlling the power of a laser beam with an electrical drive signal. A bulk electrooptic amplitude modulator consists of a voltagetunable wave plate followed by a polarizer. Table 1 is a summary of the most common materials used for brimroses acousto optic modulators. Free space acousto optic modulators the brimrose free space acousto optic modulator aom with rf driver is used to vary and control laser beam intensity. This barcode number lets you verify that youre getting exactly the right version or edition of a book. We present to the reader the mathematical formalism used to describe this phenomena as well as the common. Schematic setup of a nonresonant acoustooptic modulator. A is a world leader in the manufacturing of quality acousto optic and radio frequency devices. Acousto optics is a phenomenon which deals with the interaction of light optics and sound acoustics. Acoustooptic application note modulator model 3000 series this data sheet is issued to provide outline information only and crystal technology, inc.

It is electronically programmable using a microprocessor connected to the brimrose rf driver unit. Liquid crystal modulators it is possible to modulate the polarization of light by applying a voltage to a liquid crystal material, and to obtain intensity modulation by adding a polarizer. Npl scientists have furthered their development of a novel acoustooptic laserbased measurement technique for mapping how sound radiates from. An introduction to electrooptic devices sciencedirect.

A guide to acoustooptic modulators nickerson devices. The existence of an interaction between light and sound was discovered by brillouin in the. Rf driver power supply for the rf driver function generator or other variable voltage source for controlling the rf driver function generator square wave at modulation frequency dc power 24 v, 0. A is a world leader in the manufacturing of quality acoustooptic and radio frequency devices. For materials with a fixed acoustic velocity, the acoustic wavelength is a function of the frequency of the drive signal. The maximum modulation frequency or modulation bandwidth df can be roughly calculated with the rise time t. Interesting alternative that can be used to scan the beam is the acoustooptical modulator or a socalled bragg cell. Free space acoustooptic modulators the brimrose free space acoustooptic modulator aom with rf driver is used to vary and control laser beam intensity. Develops the underlying theory of acoustooptics from first principles, formulating results suitable for subsequent calculations and design.

Acousto optic modulator aom uses a sound wave to modulate an incoming beam of light to optimize optical systems and devices. Aa optoelectronic offers its customers solutions from prototype design to large volume manufacturing thanks to its internal resources. The driver maximum output power is factory preset to the specified level 1 watt. The maximum modulation frequency or modulation bandwidth df can be roughly calculated with the rise time. Read this book about acousto optic devices and applications. Meggitt, in instrumentation reference book fourth edition, 2010. Theory and implementation, second edition optical science and engineering 9780824789251. Our modulators are optimized for low scatter and high laser damage threshold.

Acousto optic modulators are devices that use sound waves to modify the amplitude, frequency, or phase of light passing through an acousto optic material. An introduction to acoustooptics scott e pollack physics 7810 fundamentals of optics and lasers university of colorado, boulder december, 2002 abstract this paper is a brief introduction to acoustooptic phenomena. Special attention is given to design procedures for the entire range of acoustooptic devices and a wide variety of applications for these devices is also described. Develops the underlying theory of acousto optics from first principles, formulating results suitable for subsequent calculations and design. The book provides the necessary background in classical crystal optics. The laser output 200 fs pulses, 840 nm, 80 khz repetition was magnified by a first telescope to fit the aperture of the acousto optic elements. Electrooptic modulation eom is an essentially important optical manipulation for onchip photonics, optical communication and optical sensing. Free space acoustooptic modulators mhz electronics. A device utilizing acoustooptic interaction ultrasonically to vary the amplitude or the phase of a light beam. For simple gray level control, the best approach is to characterize the transfer function and apply the appropriate. Theoretical and experimental analysis of the nearbragg acoustooptic effect. Acoustooptic modulators aoms naturally modulate the optical power both of the diffracted beam and the transmitted nondiffracted beam. A transducer generates a sound wave, at which a light beam is partially diffracted. Acoustooptical modulator an overview sciencedirect topics.

Within these devices incoming light bragg di racts o acoustic wavefronts which propagate through a crystal. It is perfect for anyone starting out in the field of ao and wishing to obtain handson material. Fast spatial beam shaping by acoustooptic diffraction for 3d. With emerging demands on efficient, broadband electrooptic modulation, the highperformance, integrated electrooptic modulation becomes indispensable. Acoustooptic material selection a variety of different acousto optic materials are used depending on the laser parameters such as l aser wavelength optical transmission range, polarization, and power density. Acoustooptic modulators are devices that use sound waves to modify the amplitude, frequency, or phase of light passing through an acoustooptic material. The acousto optic modulator the acousto optic modulator is based on the elasto optic effect, in which a material strain causes a change in the refraction index of the material. An introduction to electrooptic devices 1st edition elsevier. Rp photonics encyclopedia intensity modulators, acousto. It promises high performance applications in biomedical. This angle is in the plane of deflection and relative to a normal from the input optical surface. Osa detailed analysis of the longitudinal acoustooptical.

Each aom model has an rf driver made specifically for it. The scheme of acoustooptic modulation is illustrated in the upper panel of fig. Optical setups require extreme precision, and researchers must often implement modulators to adjust the frequency, amplitude, wavelength, and direction of their laser beam. For those already in the field, it is a handy reference. An acoustooptic modulator aom is a device which can be used for controlling the power of a laser beam with an electrical drive signal. How an aom works an aom is a crystal connected to a piezoelectric transducer. In this paper, 3d finite element and transfer matrix methods allow investigating the electrical, mechanical and optical resonances of an. It is shown that the aom design can be considerably simplified and its size can be minimized if the ramannath diffraction mode is the dominant diffraction mode of aom. Jan 17, 20 npl scientists have furthered their development of a novel acousto optic laserbased measurement technique for mapping how sound radiates from acoustic sources through collaboration with pmc ltd. They are used in lasers for qswitching, telecommunications for signal modulation, and in spectroscopy for frequency control. Table 1 is a summary of the most common materials used for brimroses acousto. Optics fundamentals of photonics wiley online library. Design and fabrication of acoustooptic devices optical. When the strain is generated by an acoustic compression or rarefaction, an aom is formed.

Acoustooptic modulation for sound transmission youtube. Acousto optic modulators aoms naturally modulate the optical power both of the diffracted beam and the transmitted nondiffracted beam. Rf load, if it is desired to measure the modulator rf output power. Applying a radiofrequency electrical drive to the pzt launches a highfrequency traveling sound wave in the medium. This approach utilizes an acoustooptic bragg cell frequency modulator device to provide the required highfrequency carrier signal. Thus, the modulation of the intensity is a sin2 function. Basic acousto optic modulator and driver rf 1st order output 0th order input laser beam intensity modulation sep bragg modulator driver ao modulator key parameters. Acoustooptic modulation of photonic bound state in the. Introduction to acoustooptic modulators by olen rambow september 20 omycroft. With zero acoustical signal applied, the full incident power is transmitted in the nondiffracted beam. Mccarron december 7, 2007 1 introduction acousto optic modulators aoms are useful devices which allow the frequency, intensity and direction of a laser beam to be modulated. This work offers detailed discussions on all aspects of acoustooptic deflectors, modulators and tunable filters, emphasizing handson procedures for design, fabrication and testing.

Theoretical and experimental analysis of the nearbragg acousto optic effect. Acoustooptic modulators selection guide engineering360. A acousto optic modulator has a nonlinear transfer function, and as a result, care must be exercised when applying an analog modulation signal to a acousto optic modulator. D displacement vector d width of the electrooptic crystal. Acousto optic modulator news newspapers books scholar jstor december 2009. The refractive index of an optical medium is altered by the presence of sound. Also known as bragg cell explanation of acoustooptic modulator. Acoustooptic modulator driven by surface acoustic waves. It contains previously unpublished treatments of acoustooptic device design and impedance matching, permitting the a. This excerpt gives a succinct example of an acoustooptic modulator bragg cell. It contains previously unpublished treatments of acoustooptic device design and impedance matching, permitting the actual design of real devices and devicematching circuits. The rf driver features all the necessary components to drive the modulator with analog or.

Acoustooptical effects principles and applications. Part of the springer series in optical sciences book series ssos, volume 33. This acts like a phase grating, traveling through the crystal at the acoustic velocity of the material and with an acoustic wavelength dependent on the frequency of the rf. Acoustooptics and applications acoustooptic modulator driven by surface acoustic waves s. An acoustooptic modulator aom, also called a bragg cell, uses the acoustooptic effect to diffract and shift the frequency of light using sound waves usually at radiofrequency. Buy a discounted hardcover of acoustooptic signal processing online from australias leading online bookstore. Sound therefore modifies the effect of the medium on light. Model h401d acoustooptic modulator driver allows flexible operation of the h400 series devices in either rf phase modulation mode or in conventional rf pulse onoff am modulation mode model h903 acoustooptic wideband uv deflectormodulator allows light from an ultraviolet uv optical source to be deflected over a range of angles. The achievable extinction ratio can be more than 50 db, i. The interaction frequencies between longitudinal acoustic waves and fiber bragg grating are numerically and experimentally assessed. For the love of physics walter lewin may 16, 2011 duration. Design and fabrication of acoustooptic devices crc.

Acoustooptic modulator bragg cell spie digital library. Rp photonics encyclopedia acoustooptic modulators, aom. Part i operation of the acoustooptic modulator simple analysis of acoustooptic deflection. Adjustment of the rf output power is best done with the series 230 driver connected to the acousto optic modulator. Mccarron december 7, 2007 1 introduction acoustooptic modulators aoms are useful devices which allow the frequency, intensity and direction of a laser beam to be modulated. Connect the rf output bnc jack to an acoustooptic modulator or a 50q, rf load, if it is desired to measure the modulator rf output power. Fast spatial beam shaping by acoustooptic diffraction for. Acoustooptic modulators aoms are useful devices which allow the fre quency, intensity and direction of a laser beam to be modulated. Applying a radiofrequency electrical drive to the pzt launches a. Acoustooptic signal processing, theory and implementation. The material showed one example of having a laser beam shinning on the intensitymodulated acoustooptic modulator which is driven by a rf signal of some frequency e. Sep 05, 20 for the love of physics walter lewin may 16, 2011 duration.

Part of the advanced texts in physics book series adtp. Since the grating modulation depends on the acoustic drive, the combined analysis provides a more efficient operation. Finally, acoustooptic and magnetooptic modulators are briefly discussed and compared with electrooptic modulators. Kaminow, microwave modulation of the electrooptic effect in kh2p04, phys. An acousto optic modulator aom can be used to slowly or rapidly modulate the intensity of a laser beam for example, a variation of this component is specifically designed for use as a qswitch inside a laser cavity. Schematic setup of a nonresonant acousto optic modulator. Acoustooptic modulators aom allow the intensity of light to be controlled and modulated at rates that far exceed mechanical shutters, even up to 70 mhz. The aom q switched fiber laser is modulated by low voltage, so it can abtain highpower pulse with. Acoustooptic modulator article about acoustooptic modulator. Kakio interdisciplinary graduate school of medicine and engineering, university of amanashi,y kofu 4008511, japan in this paper, an introduction to the design, fabrication, evaluation, and application of. Theory and implementation, second edition optical science and engineering 2nd edition by berg author isbn. Interesting alternative that can be used to scan the beam is the acousto optical modulator or a socalled bragg cell. Fast spatial beam shaping by acoustooptic diffraction for 3d nonlinear microscopy article pdf available in optics express 2322. There is a limitation to the modulation frequency mainly because of the finite velocity of the acoustic wave.

Sound is a dynamic strain involving molecular vibrations that take the form of which travel at a velocity characteristic of the medium the velocity of sound. Booktopia has acoustooptic signal processing, theory and implementation, second edition by berg. A linear polarizer lpvisb100 or lpnir100 placed after the source ensured the polarization of the input light was at a 45 angle to the optic axis of the eoamnrc1 electrooptic amplitude modulator. Connect the rf output bnc jack to an acousto optic modulator or a 50q, rf load, if it is desired to measure the modulator rf output power. By manipulating phase or amplitude of optical field, optical information will be codedmodulated. A acoustooptic modulator has a nonlinear transfer function, and as a result, care must be exercised when applying an analog modulation signal to a acoustooptic modulator. Special attention is given to design procedures for the entire range of acousto optic devices and a wide variety of applications for these devices is also described. Adjustment of the rf output power is best done with the series 230 driver connected to the acoustooptic modulator. When used as a light modulator, an acousto optic crystal is crossed by a modulated elastic wave. In our experiment, the acousto optic interaction length of the aom designed primarily for operation in such a mode was 2 mm.