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Dye cassettes tune lasers
New products Ceramic Crystals
Graphite cone laser calorimeters
Capitalising on experience gained in growing rubies and other crystals, International Research & Development has extended its activities and is producing individual ceramic single crystals for specialised research purposes.
Large aperture, graphite cone calorimeters, manufactured by cilas of.France for use with lasers, are available from Hadron.
Beam diameters of 16, 32, 45 and 64 mm are covered in four models which have sensitivites of 30 mV j-1 Crystals available include calcium, (64 mm) to 150 mV j-1 (16 mm) and barium and strontium aluminates; maximum input energies of 16 J lanthanum, lanthanum/strontium and (64 mm) to2 J (16 mm). Pulses at lanthanum/lead manganites; and power levels up to 101:W can be calcium tungstates. These crystals can measured. The calorimeters each have be doped with neodymium or chromium an input cone and a reference cone, ions when required. Electro-optic single which reduces zero drift caused by crystals, such as lithium niobate and changes in ambient temperature and barium sodium niobate for non-linear stray radiation. Hadron lnc, 800 Shames optical devices have also been produced. Drive, Westbury, N. Y. 11590, USA. The crystals are grown by the Czochralski technique which yields single crystals of high optical purity and chemical homogeneity.
International Research & Development Co. L td., Fossway, Newcastle-uponTyne, NE6 2YD, UK.
Neodymium laser used to monitor smoke density A smoke density monitor, available now from Siemens, uses a neodymium laser, with a peak power of 1 MW and a 20 ns pulse time. The 1.06/am pulse of light is reflected from encountered smoke and dust clouds, and the returning light is intercepted by a condensing lens which focuses the beam onto a germanium Growing crystals at I RD. photodiode. The data from the photodiode is analysed and displayed on an oscilloscope. The device can Dye cassettes tune lasers also be used to measure general atmospheric haze and visibility. Siemens claim Dye cassettes are now available from that it is well within the bounds of Avco-Everett Research Laboratory possibility that it could also be to tune the series of pulsed nitrogen modified to determine the chemical lasers at repetition rates up to 500 nature of air contaminants by using pulses per second. There are ten cassettes different wavelengths. to cover the range from 360-670 nm and to offer average power of 50 mW. Siemens A G., D. 8540 Erlangen 2,
A vco Everett Research Laboratory, Everett, Mass. 02149, USA.
Postfach 325, Federal Republic of Germany.
Smoke density momtor
Piezo-optical polariser A piezo-optical device for modulating the polarization state of light has been developed by Morvue Electronic Systems. It operates from 180-2600 nm with a fused silica optical element. A 0.130-9.5 p.rn version is available which uses a calcium fluoride element. Significant features include an aperture of 1.65 cm and large angular acceptance. Modulation is sinusoidal at 50 kHz. Modulation amplitude is now calibrated from + 0.005 wavelengths to + 0.5 wavelengths retardation at 1/am. Amplitude and phase reference outputs have improved stability. Various specific applications inciude use as a periodic shutter; dichroism measurements - both linear and circular; light measurement of the polarization of an arbitrary light beam; and precise measurement of strain in windows and transparent materials.
Hinds lnternational lnc., P.O. Box 4192, Portland, Oregon 97208, USA.
Twyman-Green interferometer Tropel has developed a laser interferometer of the Twyman-Green type, designed to test convex, concave, and flat surfaces. The interferometer, which has an output wavelength of 632.8 nm is termed the SMI. A high quality focusing lens in one arm of the interferometer produces a spherical wavefront. First, the wavefront is made to match the nominal curvature of the surface under test. In
Optics and Laser Technology
April 1972
93
Graphite cone laser calorimeters
Capitalising on experience gained in growing rubies and other crystals, International Research & Development has extended its activities and is producing individual ceramic single crystals for specialised research purposes.
Large aperture, graphite cone calorimeters, manufactured by cilas of.France for use with lasers, are available from Hadron.
Beam diameters of 16, 32, 45 and 64 mm are covered in four models which have sensitivites of 30 mV j-1 Crystals available include calcium, (64 mm) to 150 mV j-1 (16 mm) and barium and strontium aluminates; maximum input energies of 16 J lanthanum, lanthanum/strontium and (64 mm) to2 J (16 mm). Pulses at lanthanum/lead manganites; and power levels up to 101:W can be calcium tungstates. These crystals can measured. The calorimeters each have be doped with neodymium or chromium an input cone and a reference cone, ions when required. Electro-optic single which reduces zero drift caused by crystals, such as lithium niobate and changes in ambient temperature and barium sodium niobate for non-linear stray radiation. Hadron lnc, 800 Shames optical devices have also been produced. Drive, Westbury, N. Y. 11590, USA. The crystals are grown by the Czochralski technique which yields single crystals of high optical purity and chemical homogeneity.
International Research & Development Co. L td., Fossway, Newcastle-uponTyne, NE6 2YD, UK.
Neodymium laser used to monitor smoke density A smoke density monitor, available now from Siemens, uses a neodymium laser, with a peak power of 1 MW and a 20 ns pulse time. The 1.06/am pulse of light is reflected from encountered smoke and dust clouds, and the returning light is intercepted by a condensing lens which focuses the beam onto a germanium Growing crystals at I RD. photodiode. The data from the photodiode is analysed and displayed on an oscilloscope. The device can Dye cassettes tune lasers also be used to measure general atmospheric haze and visibility. Siemens claim Dye cassettes are now available from that it is well within the bounds of Avco-Everett Research Laboratory possibility that it could also be to tune the series of pulsed nitrogen modified to determine the chemical lasers at repetition rates up to 500 nature of air contaminants by using pulses per second. There are ten cassettes different wavelengths. to cover the range from 360-670 nm and to offer average power of 50 mW. Siemens A G., D. 8540 Erlangen 2,
A vco Everett Research Laboratory, Everett, Mass. 02149, USA.
Postfach 325, Federal Republic of Germany.
Smoke density momtor
Piezo-optical polariser A piezo-optical device for modulating the polarization state of light has been developed by Morvue Electronic Systems. It operates from 180-2600 nm with a fused silica optical element. A 0.130-9.5 p.rn version is available which uses a calcium fluoride element. Significant features include an aperture of 1.65 cm and large angular acceptance. Modulation is sinusoidal at 50 kHz. Modulation amplitude is now calibrated from + 0.005 wavelengths to + 0.5 wavelengths retardation at 1/am. Amplitude and phase reference outputs have improved stability. Various specific applications inciude use as a periodic shutter; dichroism measurements - both linear and circular; light measurement of the polarization of an arbitrary light beam; and precise measurement of strain in windows and transparent materials.
Hinds lnternational lnc., P.O. Box 4192, Portland, Oregon 97208, USA.
Twyman-Green interferometer Tropel has developed a laser interferometer of the Twyman-Green type, designed to test convex, concave, and flat surfaces. The interferometer, which has an output wavelength of 632.8 nm is termed the SMI. A high quality focusing lens in one arm of the interferometer produces a spherical wavefront. First, the wavefront is made to match the nominal curvature of the surface under test. In
Optics and Laser Technology
April 1972
93