|  | 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 (light sources per se Fulltext... Hierarchy... Expanded...F21, Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01J 61/00-H01J 65/00, Fulltext... Hierarchy... Expanded...H01K, Fulltext... Hierarchy... Expanded...H01L 33/00, Fulltext... Hierarchy... Expanded...H01S 3/00, Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H05B 31/00-H05B 35/00; optical-mechanical scanning systems Fulltext... Hierarchy... Expanded...G02B 27/17; control of position or direction of light sources Fulltext... Hierarchy... Expanded...G05D 3/02; control of light intensity in general Fulltext... Hierarchy... Expanded...G05D 25/00; 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 in which the controlling is effected by electric or magnetic means or by sound or like mechanical vibrations and 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) [2]

|  | G02F 1/02 - G02F 1/12 |
( covered by Fulltext... Hierarchy... Expanded...H01S 3/10, Fulltext... Hierarchy... Expanded...H05B )

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

|  | G02F 1/05 |
· · · | with ferro-electric properties (static storages per se Fulltext... Hierarchy... Expanded...G11C) [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 1/16 - G02F 1/42 |
( transferred to Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...G02F 1/01-G02F 1/39 )

|  | G02F 1/17 |
· · | by using variable absorption devices (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...G02F 1/03-G02F 1/13 take precedence) [2]

|  | G02F 1/19 |
· · | by using variable reflection or refraction (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...G02F 1/03-G02F 1/13 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; display panels 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 3/10) [2]

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

|  | 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 39/00, 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