1. A laser frequency adjustment method, comprising the following steps:
(1) providing a primitive laser pulse;
(2) using a beam splitter to split the primitive laser pulse into a first sub-laser pulse and a second sub-laser pulse that are respectively transmitted in two directions;
(3) using a number of reflectors to reflect the first sub-laser pulse to the location where the second sub-laser pulse exits the beam splitter and making the first sub-laser pulse passing through an optical length extension device during the transmission of the first sub-laser pulse; and
(4) the first sub-laser pulse, after reflected by the beam splitter, being in the same transmission direction as the second sub-laser pulse so as to be superimposed on the second sub-laser pulse and using a compensator sheet to adjust the transmission direction of a laser pulse formed through the superimposition, wherein the first and second sub-laser pulses, after being superimposed, are spaced from each other by an interval to form two separate sub-laser pulses to achieve frequency adjustment.
2. The laser frequency adjustment method as claimed in claim 1, wherein the first sub-laser pulse is formed by a part of the primitive laser pulse reflected on a surface of the beam splitter and the second sub-laser pulse is formed by a part of the primitive laser pulse that transmits through the beam splitter and exits an opposite surface thereof, whereby energy ratios of the first sub-laser pulse and the second sub-laser pulse with respect to the primitive laser pulse are adjustable by adjusting reflectivity of the beam splitter.
3. The laser frequency adjustment method as claimed in claim 2, wherein energy of the first sub-laser pulse is 50% of energy of the primitive laser pulse and energy of the second sub-laser pulse is 50% of the energy of the primitive laser pulse.
4. The laser frequency adjustment method as claimed in claim 1, wherein the optical length extension device comprises: optical crystal and high-transmittance antireflective layers respectively arranged at two ends of the optical crystal, the first sub-laser pulse entering the optical crystal through the high-transmittance antireflective layer of an end thereof and exiting through the high-transmittance antireflective layer of another end of the optical crystal.
5. The laser frequency adjustment method as claimed in claim 4, wherein the optical crystal is an optical crystal that shows an electro-optic effect, the optical crystal having a refractive index that is greater than 3 for laser having a wavelength of 308 nm, the high-transmittance antireflective layers being made of MgF2 or Al2O3.
6. The laser frequency adjustment method as claimed in claim 1, wherein the number of the reflectors is four, being respectively first to fourth reflector, whereby the first sub-laser pulse exists the beam splitter and is then reflected by the first reflector to the third reflector, and then reflected by the third reflector to the optical length extension device and passing through the optical length extension device to reach the second reflector, and then reflected by the second reflector to the fourth reflector, so as to be reflected by the fourth reflector to project, at a predetermined angle, to the location where the second sub-laser pulse exits the beam splitter to be superimposed on the second sub-laser pulse.
7. The laser frequency adjustment method as claimed in claim 1, wherein the superimposition of the first sub-laser pulse and the second sub-laser pulse forms a laser pulse that is subjected to the adjustment by the compensator sheet to be set in the same transmission direction as the primitive laser pulse and at the same altitude.
8. A laser frequency adjustment method, comprising the following steps:
(1) providing a primitive laser pulse;
(2) using a beam splitter to split the primitive laser pulse into a first sub-laser pulse and a second sub-laser pulse that are respectively transmitted in two directions;
(3) using a number of reflectors to reflect the first sub-laser pulse to the location where the second sub-laser pulse exits the beam splitter and making the first sub-laser pulse passing through an optical length extension device during the transmission of the first sub-laser pulse; and
(4) the first sub-laser pulse, after reflected by the beam splitter, being in the same transmission direction as the second sub-laser pulse so as to be superimposed on the second sub-laser pulse and using a compensator sheet to adjust the transmission direction of a laser pulse formed through the superimposition, wherein the first and second sub-laser pulses, after being superimposed, are spaced from each other by an interval to form two separate sub-laser pulses to achieve frequency adjustment;
wherein the optical length extension device comprises: optical crystal and high-transmittance antireflective layers respectively arranged at two ends of the optical crystal, the first sub-laser pulse entering the optical crystal through the high-transmittance antireflective layer of an end thereof and exiting through the high-transmittance antireflective layer of another end of the optical crystal; and
wherein the optical crystal is an optical crystal that shows an electro-optic effect, the optical crystal having a refractive index that is greater than 3 for laser having a wavelength of 308 nm, the high-transmittance antireflective layers being made of MgF2 or Al2O3.
9. The laser frequency adjustment method as claimed in claim 8, wherein the first sub-laser pulse is formed by a part of the primitive laser pulse reflected on a surface of the beam splitter and the second sub-laser pulse is formed by a part of the primitive laser pulse that transmits through the beam splitter and exits an opposite surface thereof, whereby energy ratios of the first sub-laser pulse and the second sub-laser pulse with respect to the primitive laser pulse are adjustable by adjusting reflectivity of the beam splitter.
10. The laser frequency adjustment method as claimed in claim 9, wherein energy of the first sub-laser pulse is 50% of energy of the primitive laser pulse and energy of the second sub-laser pulse is 50% of the energy of the primitive laser pulse.
11. The laser frequency adjustment method as claimed in claim 8, wherein the number of the reflectors is four, being respectively first to fourth reflector, whereby the first sub-laser pulse exists the beam splitter and is then reflected by the first reflector to the third reflector, and then reflected by the third reflector to the optical length extension device and passing through the optical length extension device to reach the second reflector, and then reflected by the second reflector to the fourth reflector, so as to be reflected by the fourth reflector to project, at a predetermined angle, to the location where the second sub-laser pulse exits the beam splitter to be superimposed on the second sub-laser pulse.
12. The laser frequency adjustment method as claimed in claim 8, wherein the superimposition of the first sub-laser pulse and the second sub-laser pulse forms a laser pulse that is subjected to the adjustment by the compensator sheet to be set in the same transmission direction as the primitive laser pulse and at the same altitude.
13. A laser frequency adjustment system, comprising: an incidence port, a beam splitter, a number of reflectors, an optical length extension device, a compensator sheet, and an exit port, the beam splitter being arranged to correspond to the incidence port, the compensator sheet being arranged to correspond to the exit port, whereby a primitive laser pulse gets incident from the incidence port to the beam splitter and is split by the beam splitter into a first sub-laser pulse and a second sub-laser pulse that are respectively transmitted in two directions, the number of reflectors reflecting the first sub-laser pulse to reach, at a predetermined angle, the location where the second sub-laser pulse exits the beam splitter to be superimposed on the second sub-laser pulse and then subjected to adjustment of transmission direction by the compensator sheet to exit from the exit port, the optical length extension device being arranged on the optical path of transmission of the first sub-laser pulse, wherein the first and second sub-laser pulses, after being superimposed, are spaced from each other by an interval to form two separate sub-laser pulses to achieve frequency adjustment.
14. The laser frequency adjustment system as claimed in claim 13, wherein the first sub-laser pulse is formed by a part of the primitive laser pulse reflected on a surface of the beam splitter and the second sub-laser pulse is formed by a part of the primitive laser pulse that transmits through the beam splitter and exits an opposite surface thereof, whereby energy ratios of the first sub-laser pulse and the second sub-laser pulse with respect to the primitive laser pulse are adjustable by adjusting reflectivity of the beam splitter, energy of the first sub-laser pulse being 50% of energy of the primitive laser pulse and energy of the second sub-laser pulse being 50% of the energy of the primitive laser pulse; and
the optical length extension device comprising: optical crystal and high-transmittance antireflective layers respectively arranged at two ends of the optical crystal, the first sub-laser pulse entering the optical crystal through the high-transmittance antireflective layer of an end thereof and exiting through the high-transmittance antireflective layer of another end of the optical crystal, the optical crystal being an optical crystal that shows an electro-optic effect, the optical crystal having a refractive index that is greater than 3 for laser having a wavelength of 308 nm, the high-transmittance antireflective layers being made of MgF2 or Al2O3.
15. The laser frequency adjustment system as claimed in claim 13, wherein the number of the reflectors is four, being respectively first to fourth reflector, whereby the first sub-laser pulse exists the beam splitter and is then reflected by the first reflector to the third reflector, and then reflected by the third reflector to the optical length extension device and passing through the optical length extension device to reach the second reflector, and then reflected by the second reflector to the fourth reflector, so as to be reflected by the fourth reflector to project, at a predetermined angle, to the location where the second sub-laser pulse exits the beam splitter to be superimposed on the second sub-laser pulse.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A programmable logic device (PLD), comprising:
a control circuitry;
a body-bias generator coupled to the control circuitry, the body-bias generator configured to set a body bias of a transistor within the programmable logic device (PLD); and
a variable impedance device coupled to the control circuitry, the variable impedance device configured to control power dissipation of a first circuit within the programmable logic device (PLD), wherein the first circuit comprises a circuit unused in an electronic circuit implemented by the programmable logic device (PLD).
2. The programmable logic device (PLD) according to claim 1, wherein the variable impedance device comprises a field-effect transistor (FET).
3. The programmable logic device (PLD) according to claim 2, wherein the body-bias generator is configured to set the body bias of the transistor so as to avoid thermal runaway within the programmable logic device (PLD).
4. The programmable logic device (PLD) according to claim 2, wherein the body-bias generator is further configured to adjust the body bias of the transistor so as to trade off performance and power consumption of the transistor.
5. The programmable logic device (PLD) according to claim 4, wherein the body-bias generator is further configured to adjust the body bias of the transistor so as to optimize the tradeoff between the performance and power consumption of the transistor.
6. The programmable logic device (PLD) according to claim 1, wherein the variable impedance device is further configured to shut down the first circuit by interrupting a supply of power to the first circuit.
7. The programmable logic device (PLD) according to claim 6, wherein the supply of power to the first circuit is provided by a supply-voltage circuit within the programmable logic device (PLD).
8. A programmable logic device (PLD), comprising:
a temperature sensor, the temperature sensor configured to sense a temperature of a first circuit in the programmable logic device (PLD);
a body-bias generator configured to set a body bias of a set of transistors in response to a control signal; and
a control circuit coupled to the temperature sensor and the body-bias generator, the control circuit configured to provide the control signal in response to a signal received from the temperature sensor.
9. The programmable logic device (PLD) according to claim 8, wherein the control circuit is further configured to provide the control signal so as to avoid thermal runaway in the set of transistors.
10. The programmable logic device (PLD) according to claim 8, wherein the control circuit is further configured to provide the control signal so as to trade off performance and power consumption of the set of transistors.
11. The programmable logic device (PLD) according to claim 10, wherein the control circuit is further configured to provide the control signal so as to optimize the tradeoff between the performance and power consumption of the set of transistors.
12. The programmable logic device (PLD) according to claim 8, wherein the set of transistors resides in the first circuit.
13. The programmable logic device (PLD) according to claim 8, wherein the control circuit is further configured to derive the control signal from a reference signal and a signal received from the temDerature sensor.
14. A programmable logic device (PLD), comprising:
means for deriving a body-bias signal from at least one parameter related to the programmable logic device (PLD); and
means for providing the body-bias signal to a transistor in a first circuit within the programmable logic device (PLD) in response to an input signal provided by a configuration memory (CRAM), wherein the at least one parameter comprises either a temperature level or control information provided by a source external to the programmable logic device (PLD).
15. A programmable logic device (PLD), comprising:
means for deriving a body-bias signal from at least one parameter related to the programmable logic device (PLD); and
means for providing the body-bias signal to a transistor in a first circuit within the programmable logic device (PLD) in response to an input signal, wherein the at least one parameter comprises either a temperature level or control information provided by a source external to the programmable logic device (PLD), wherein the first circuit comprises a controller.