公开(公告)号：CA1084151A

公开(公告)日：1980-08-19

申请号：CA277470

申请日：1977-05-03

Applicant: IBM

Inventor： GRISCHKOWSKY DANIEL R ,  HODGSON RODNEY T ,  SOROKIN PETER P

IPC: H01S3/30 ,  G02F1/35 ,  H01S3/09 ,  H01S3/10

Abstract: APPARATUS FOR PRODUCING TUNABLE INTENSE COHERENT RADIATION IN THE VICINITY OF 628 CM. -1 Apparatus for producing tunable intense coherent radiation at approximately 628 cm.-1 with a line width less than 0.1 cm.-1. The apparatus includes an optical cavity containing a vapor cell and pumping means including at least one optical pumping source for directing energy at the cavity. In one embodiment the cavity encloses a material capable of stimulated emission in response to said pumping. The material has at least three atomic energy level with at least a first and second atomic energy level separated by a particular energy quantum approximately equal to 628 cm-1; a transition from said first to said second atomic energy level favored over all other possible transitions from said first atomic energy level; said third atomic energy level, from which atoms can be pumped to said fist atomic energy level in response to said pumping means. While this is consistent with classical laser operation the apparatus disclosed herein can also be used for stimulated Raman scattering. Tunability is achieved by tuning the pumping sources in the case of stimulated Raman scattering, or with the aid of the Zeeman or Stark effects for classical laser operation. Typical materials are potassium or strontium vapors. Several pumping arrangements are also disclosed.

公开(公告)号：DE68923924T2

公开(公告)日：1996-04-18

申请号：DE68923924

申请日：1989-05-22

Applicant: IBM

Inventor： DULING III ,  GRISCHKOWSKY DANIEL R ,  HALBOUT JEAN-MARC ,  KETCHEN MARK B

IPC: H01L31/0248 ,  H01S3/00 ,  H03B11/00 ,  H04B10/00 ,  H04B10/02 ,  H04B10/10 ,  H04B10/118 ,  H04B10/22 ,  H04B10/43 ,  H04L27/04

Abstract: A communication system for transmitting and receiving terahertz signals has a emitter employing a resonant radiating antenna (5) connected to an ultrafast switch (6). The switch (6) is a subpicosecond photoconducting switch coupled to a coplanar transmission line (11) having a pair of approximately 1 micron wide A1 lines deposited on an SOS substrate. The transmission line (11) is separated from the tip of the antenna (5) by a photoconducting gap forming the switch and is driven by a laser pulse. Utilizing the gap excitation principle, the transmitting antenna (5) radiates a freely propagating signal that may be received by an identical structure either on the same or on different substrates.

公开(公告)号：DE68917228D1

公开(公告)日：1994-09-08

申请号：DE68917228

申请日：1989-05-31

Applicant: IBM

Inventor： GRISCHKOWSKY DANIEL R

IPC: H01S3/00 ,  G02F1/35 ,  H03K3/42 ,  H03K17/78 ,  H04B10/04 ,  H04B10/06 ,  H04B10/14 ,  H04B10/26 ,  H04B10/43

Abstract: A method of generating subpicosecond electrical pulses on a micron sized coplanar transmission line (10, 12) fabricated on an insulating, nonlinear optical substrate, by driving the line with focused ultrashort optical pulses. The pulses are generated directly on the transmission line by the optical rectification effect acting on the focal volume (16) between the two lines of the transmission line of the focused ultrashort laser pulses. In the second embodiment, the transmission line (10, 12) is charged and the electrical pulse is generated by changing the capacitance in the focal volume (16) between the two lines (10, 12) of the transmission line by the optical Kerr effect acting on the focused ultrashort optical pulses.

公开(公告)号：DE68923924D1

公开(公告)日：1995-09-28

申请号：DE68923924

申请日：1989-05-22

Applicant: IBM

Inventor： DULING III ,  GRISCHKOWSKY DANIEL R ,  HALBOUT JEAN-MARC ,  KETCHEN MARK B

IPC: H01L31/0248 ,  H01S3/00 ,  H03B11/00 ,  H04B10/00 ,  H04B10/02 ,  H04B10/10 ,  H04B10/118 ,  H04B10/22 ,  H04B10/43 ,  H04L27/04

Abstract: A communication system for transmitting and receiving terahertz signals has a emitter employing a resonant radiating antenna (5) connected to an ultrafast switch (6). The switch (6) is a subpicosecond photoconducting switch coupled to a coplanar transmission line (11) having a pair of approximately 1 micron wide A1 lines deposited on an SOS substrate. The transmission line (11) is separated from the tip of the antenna (5) by a photoconducting gap forming the switch and is driven by a laser pulse. Utilizing the gap excitation principle, the transmitting antenna (5) radiates a freely propagating signal that may be received by an identical structure either on the same or on different substrates.

公开(公告)号：FR2366718A1

公开(公告)日：1978-04-28

申请号：FR7716045

申请日：1977-05-17

Applicant: IBM

Inventor： BENNETT ROBERT J ,  GRISCHKOWSKY DANIEL R

IPC: G02F1/17 ,  G02F1/01 ,  G02F1/35 ,  G02F2/02 ,  H01S3/10

Abstract: A dark pulse is manifested when the intensity of a laser beam, for example, a continuous wave laser beam drops to zero and returns to its original intensity in a very short time period. A modulator for producing dark pulse outputs is disclosed which includes a two-photon absorption cell provided with two input laser beams: a continuous wave beam having a frequency omega 1 and a mode-locked laser beam having a frequency omega 2 selected such that omega 1 + omega 2 = OMEGA 12 where OMEGA 12 is also the two-photon absorption frequency of the vapor contained in the cell. The mode locked beam modulates the continuous wave beam to produce the desired dark pulses.

公开(公告)号：DE68917228T2

公开(公告)日：1995-03-09

申请号：DE68917228

申请日：1989-05-31

Applicant: IBM

Inventor： GRISCHKOWSKY DANIEL R

IPC: H01S3/00 ,  G02F1/35 ,  H03K3/42 ,  H03K17/78 ,  H04B10/04 ,  H04B10/06 ,  H04B10/14 ,  H04B10/26 ,  H04B10/43

Abstract: A method of generating subpicosecond electrical pulses on a micron sized coplanar transmission line (10, 12) fabricated on an insulating, nonlinear optical substrate, by driving the line with focused ultrashort optical pulses. The pulses are generated directly on the transmission line by the optical rectification effect acting on the focal volume (16) between the two lines of the transmission line of the focused ultrashort laser pulses. In the second embodiment, the transmission line (10, 12) is charged and the electrical pulse is generated by changing the capacitance in the focal volume (16) between the two lines (10, 12) of the transmission line by the optical Kerr effect acting on the focused ultrashort optical pulses.

公开(公告)号：FR2363211A1

公开(公告)日：1978-03-24

申请号：FR7711170

申请日：1977-04-05

Applicant: IBM

Inventor： GRISCHKOWSKY DANIEL R ,  HODGSON RODNEY T ,  SOROKIN PETER P

IPC: H01S3/30 ,  G02F1/35 ,  H01S3/09

公开(公告)号：DE2439536A1

公开(公告)日：1975-07-10

申请号：DE2439536

申请日：1974-08-17

Applicant: IBM

Inventor： ARMSTRONG JOHN A ,  GRISCHKOWSKY DANIEL R

IPC: G01N24/00 ,  G02F1/01 ,  G02F1/29

Abstract: A light controlled light modulator is disclosed wherein a low intensity, circularly polarized driving light beam can be used to modulate or switch a linearly polarized main light beam. The main beam can be as much as three orders of magnitude more powerful than the driving beam, yet the response time is measured in picoseconds. The modulator itself comprises a coherent rotator and a polarizer, and modulation is accomplished by rotating the plane of polarization of the main beam under the control of the driving beam. The coherent rotator is a completely passive device and is a light cell containing an alkali metallic vapor such as rubidium or potassium.