1. A high pass filter, comprising:
a capacitor connected between an input port and an output port;
a first transistor having a first terminal connected to a first voltage source and a second terminal connected to the output port;
a second transistor having a first terminal connected to the second terminal of the first transistor and a second terminal connected to ground; and
a second voltage source coupled to a third terminal of the first transistor and the second transistor such that the first and the second transistors are operated as a large-resistance resistor, the second voltage source comprising:
a third transistor having a first terminal connected to the first voltage source, a second terminal connected to the third terminal of the first and the second transistor, and a third terminal connected to the second terminal thereof; and
a four transistor having a first terminal connected to the second terminal of the first transistor, a second terminal connected to ground, and a third terminal connected to the first terminal thereof.
2. The high-pass filter of claim 1, wherein the first transistor is an n-type transistor.
3. The high-pass filter of claim 1, wherein the second transistor is a p-type transistor.
4. The high-pass filter of claim 1, wherein the first and the second transistors are operated in a saturation mode.
5. A high-pass filter, comprising:
a capacitor connected between an input port and an output port;
a first transistor having a first terminal connected to a first voltage source and a second terminal connected to the output port;
a second transistor having a first terminal connected to the second terminal of the first transistor and a second terminal connected to ground; and
a second voltage source coupled to a third terminal of the first transistor and the second transistor such that the first and the second transistors are operated as a large-resistance resistor, the second voltage source comprising:
a third transistor having a first terminal connected to the first voltage source, a second terminal, and a third terminal;
a fourth transistor having a first terminal connected to the second terminal of the first transistor, a second terminal connected to ground, and a third terminal; and
an amplifier having a first input terminal connected to the second terminal of the first transistor, a second input terminal connected to a bias voltage source, and an output terminal connected to the third terminal of the first, the second, the third, and the fourth transistor.
6. The high-pass filter of claim 5, wherein the first transistor is an n-type transistor.
7. The high-pass filter of claim 5, wherein the second transistor is a p-type transistor.
8. The high-pass filter of claim 5, wherein the first and the second transistors are operated in a saturation mode.
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 laser system, comprising:
a source for producing input energy in response to an input drive signal;
a laser medium for receiving the input energy and converting the input energy to a circulating beam;
first and second mirrors disposed on opposing sides of the laser medium, the circulating beam reflecting between the first and second mirrors, the first mirror being an output mirror for releasing a pulsed laser beam;
a displacer disposed between the first and second mirrors and in a path of the circulating beam, the displacer splitting the circulating beam into an e-polarized wave and an o-polarized wave;
a Pockels cell disposed between the displacer and the second mirror, the Pockels cell being energized to change the polarization state of the polarized waves and deenergized to allow transmission of the waves without a polarization change; and
a control system coupled to the Pockels cell to switch between a first state allowing the release of the pulsed laser beam and a second state dispersing the circulating beam via the displacer preventing the release of the pulsed laser beam.
2. The laser system of claim 1, wherein the source includes a laser diode array.
3. The laser system of claim 1, further comprising a quarter waveplate disposed between the Pockels cell and the second mirror, wherein the first state is activated by energizing the Pockels cell and the second state is activated by deenergizing the Pockels cell.
4. The laser system of claim 1, wherein the first state is activated by deenergizing the Pockels cell and the second state is activated by energizing the Pockels cell.
5. The laser system of claim 1, wherein the first mirror is a coating on an end surface of the laser medium.
6. The laser system of claim 5, wherein the displacer is composed of a birefringent material from the group of yttrium vanadate, calcite, or rutile.
7. The laser system of claim 1, wherein the laser medium is a rod.
8. The laser system of claim 1 further comprising an aperture disposed between the displacer and the laser medium to block the circulating beam from the displacer.
9. The laser system of claim 1, further including an input device coupled to the control system, the input device for receiving commands from an operator to control the frequency of switching between the first and second state.
10. A method of generating a pulsed laser beam from a laser system including a source that produces input energy and a laser medium that receives the input energy, the laser medium converting the input energy to a circulating beam that reflects between first and second reflective surfaces, the method comprising:
displacing the circulating beam into an e-polarized wave and an o-polarized wave;
reflecting the e-polarized wave and o-polarized wave on the second reflective surface toward the first reflective surface; and
switching between (i) an off condition to disperse the reflected e-wave and o-wave; and (ii) an on condition to combine the reflected e-wave and o-wave into the circulating beam that passes through the laser medium and creates the pulsed laser beam.
11. The method of claim 10, wherein the source includes a laser diode array.
12. The method of claim 10, wherein the displacing the circulating beam is performed via a birefringement beam displacer.
13. The method of claim 12 further comprising positioning a quarter waveplate and a Pockels cell between the displacer and the second reflective surface, wherein the on condition is activated by energizing the Pockels cell and the off condition is activated by deenergizing the Pockels cell.
14. The method of claim 12, further comprising positioning a Pockels cell between the displacer and the second reflective surface wherein the on state is activated by deenergizing a Pockels cell and the off state is activated by energizing the Pockels cell.
15. The method of claim 12, wherein the laser medium is a rod.
16. The method of claim 12 further comprising positioning an aperture between the displacer and the laser medium to block the circulating beam from the displacer.
17. A laser system, comprising:
a source for producing input energy;
a laser medium for receiving the input energy and converting the input energy to a circulating beam;
first and second reflective surfaces for reflecting the circulating beam therebetween, at least one of the reflective surfaces releasing a pulsed laser beam having an energy level;
a displacer disposed between the first and second reflective surface to split the circulating beam into an e-polarized wave and an o-polarized wave reflected by the second reflective surface;
a Pockels cell disposed between the displacer and second reflective surface, the Pockels cell being made of material that has an optical property that is alterable in response to a voltage input; and
a control system coupled to the Pockels cell to control the frequency of an on condition wherein the reflected e-polarized wave and the o-polarized wave are combined into the circulating beam and an off condition wherein the e-polarized wave and o-polarized beam are dispersed.
18. The laser system of claim 17, further comprising a quarter waveplate disposed between the Pockels cell and the second reflective surface, wherein the on condition is activated by energizing the Pockels cell and the off condition is activated by deenergizing the Pockels cell.
19. The laser system of claim 17, wherein the on condition is activated by deenergizing the Pockels cell and the off condition is activated by energizing the Pockels cell.
20. The laser system of claim 19, wherein the reflective surfaces are located on mirrors positioned away from the laser medium.
21. The laser system of claim 19 further comprising an aperture disposed between the displacer and the laser medium to block the circulating beam from the displacer.