|  | G |
SECTION G — PHYSICS

INSTRUMENTS

|  | G02 |
OPTICS (making optical elements or apparatus Fulltext... Hierarchy... Expanded...B24B, Fulltext... Hierarchy... Expanded...B29D, Fulltext... Hierarchy... Expanded...C03, or other appropriate sub-classes or classes)

|  | G02F |
CONTROLLING THE INTENSITY, COLOUR, PHASE, POLARISATION, OR DIRECTION OF LIGHT BEAMS, e.g. SWITCHING, GATING, MODULATING, OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS (optical transfer means between sensing member and indicating or recording part in connection with measuring Fulltext... Hierarchy... Expanded...G01D 5/26; devices in which mathematical operations are carried out with optical elements Fulltext... Hierarchy... Expanded...G06G 9/00; electrical signal transmission systems using optical means to convert the input signal Fulltext... Hierarchy... Expanded...G08C 19/36; information-recording by electric or magnetic means and reproducing by sensing optical properties Fulltext... Hierarchy... Expanded...G11B 11/00; static stores using optical elements Fulltext... Hierarchy... Expanded...G11C 13/04; transmission systems employing electromagnetic waves other than radio waves, e.g. light, infra-red radiation, Fulltext... Hierarchy... Expanded...H04B 9/00; television Fulltext... Hierarchy... Expanded...H04N) [2]

|  | G02F 1/00 |
Controlling the intensity, colour, phase, polarisation or direction of light beams arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics (thermometers using change of colour or translucency Fulltext... Hierarchy... Expanded...G01K 11/12; indicating arrangements consisting of an association of separate light control cells Fulltext... Hierarchy... Expanded...G09F 9/00; arrangements or circuits for control of indicating devices using static means to present variable information Fulltext... Hierarchy... Expanded...G09G; control of light sources Fulltext... Hierarchy... Expanded...H01S 3/10, Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H05B 37/00-H05B 43/00) [2]

|  | G02F 1/00 |
Note(s) This main group includes only devices, e.g. cells, the optical operation of which is modified by changing the optical properties of the medium of the device by the influence or control of physical parameters, e.g. electric fields, electric current, magnetic fields, sound or mechanical vibrations, stress or thermal effects, and it includes devices in which the electric or magnetic field component of the light beams influences the optical properties of the medium, i.e. non-linear optics, and includes the control of light by electromagnetic waves, e.g. radio waves, or by electrons or other elementary particles. [2]

|  | G02F 1/01 |
· | Controlling the intensity, phase, polarisation or colour (Fulltext... Hierarchy... Expanded...G02F 1/29 takes precedence; polarizing elements per se Fulltext... Hierarchy... Expanded...G02B 5/30; static storage per se Fulltext... Hierarchy... Expanded...G11C; image tube screens acting as light valves by shutter operation Fulltext... Hierarchy... Expanded...H01J 29/12; such screen acting by discoloration Fulltext... Hierarchy... Expanded...H01J 29/14) [2]

|  | G02F 1/015 |
· · | by using semiconductor devices with at least one potential jump barrier, e.g. PN, PIN junction (Fulltext... Hierarchy... Expanded...G02F 1/03 takes precedence) [3]

|  | G02F 1/03 |
· · | by using electro-optical crystals, e.g. by Pockels or Kerr effect [2]

|  | G02F 1/05 |
· · · | with ferro-electric properties [2]

|  | G02F 1/07 |
· · | by using electro-optical liquids exhibiting Kerr effect [2]

|  | G02F 1/09 |
· · | by using magneto-optical devices, e.g. by Faraday effect [2]

|  | G02F 1/11 |
· · | by using acousto-optical devices, e.g. using diffraction by sound or like mechanical waves (acousto-optical deflection Fulltext... Hierarchy... Expanded...G02F 1/33) [2]

|  | G02F 1/13 |
· · | by using liquid crystals [2]

|  | G02F 1/133 |
· · · | Constructional arrangements; Operation of the cell; Circuit arrangements [3]

|  | G02F 1/135 |
· · · · | Liquid crystal cells structurally associated with a supplementary layer, e.g. a photoconducting or a ferro-electric layer, the properties of which can be electrically or optically varied [3]

|  | G02F 1/137 |
· · · | characterised by a particular electro- or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction, dynamic scattering [3]

|  | G02F 1/17 |
· · | by using variable absorption devices (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...G02F 1/015-G02F 1/137 take precedence) [2]

|  | G02F 1/19 |
· · | by using variable reflection or refraction (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...G02F 1/015-G02F 1/137 take precedence) [2]

|  | G02F 1/21 |
· · | by interference [2]

|  | G02F 1/23 |
· · | Controlling colour (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...G02F 1/03-G02F 1/21 take precedence) [2]

|  | G02F 1/25 |
· · · | as to hue or predominant wavelength [2]

|  | G02F 1/29 |
· | Controlling the position or the direction of light beams, i.e. deflection (optical-mechanical scanning in general Fulltext... Hierarchy... Expanded...G02B 27/17; indicating arrangements for variable information by selection or combination of individual elements Fulltext... Hierarchy... Expanded...G09F 9/00; static stores with electric or magnetic read-in and optical read-out Fulltext... Hierarchy... Expanded...G11C; lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted Fulltext... Hierarchy... Expanded...H01S 3/101) [2]

|  | G02F 1/31 |
· · | Digital deflection (Fulltext... Hierarchy... Expanded...G02F 1/33 takes precedence) [2]

|  | G02F 1/315 |
· · · | by using controlled total internal reflection [3]

|  | G02F 1/33 |
· · | Acousto-optical deflection [2]

|  | G02F 1/35 |
· | Non-linear optics (lasers using stimulated Brillouin or Raman effect Fulltext... Hierarchy... Expanded...H01S 3/30) [2]

|  | G02F 1/37 |
· · | for second-harmonic generation [2]

|  | G02F 1/39 |
· · | for parametric generation or amplification of light, infra-red, or ultra-violet waves (electrical parametric amplifiers Fulltext... Hierarchy... Expanded...H03F 7/00) [2]

|  | G02F 2/00 |
Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light (Fulltext... Hierarchy... Expanded...G02F 1/35 takes precedence; photoelectric detecting or measuring devices Fulltext... Hierarchy... Expanded...G01J, Fulltext... Hierarchy... Expanded...H01J 40/00, Fulltext... Hierarchy... Expanded...H01L 31/00; demodulating laser arrangements Fulltext... Hierarchy... Expanded...H01S 3/10; demodulation or transference of modulation of modulated electromagnetic waves in general Fulltext... Hierarchy... Expanded...H03D 9/00) [2]

|  | G02F 2/02 |
· | Frequency-changing of light, e.g. by quantum counters (luminescent materials Fulltext... Hierarchy... Expanded...C09K 11/00) [2]

|  | G02F 3/00 |
Optical logic elements (electro-optical circuits Fulltext... Hierarchy... Expanded...H03K 19/14)

|  | G02F 7/00 |
Optical analogue/digital converters