1. A method in an electronic device of facilitating access to the electronic device, the method comprising:
detecting at the electronic device an attempt to access the electronic device;
in response to detecting the attempt, prompting for password entry at the electronic device;
receiving an entered password at the electronic device;
performing at the electronic device a first determination whether the entered password corresponds to a stored electronic device password;
transmitting the entered password to a portable authenticator that is communicably coupled to the electronic device, in order for the portable authenticator to perform a second determination whether the entered password corresponds to a stored portable authenticator password;
receiving the second determination from the portable authenticator; and
controlling access to the electronic device in accordance with the first determination and the second determination.
2. The method as claimed in claim 1, wherein the first determination is that the entered password corresponds to the stored electronic device password and the second determination is that the entered password corresponds to the stored portable authenticator password, the method further comprising:
providing access to the electronic device.
3. The method as claimed in claim 2, further comprising:
maintaining access to the electronic device after detecting decoupling of the portable authenticator from the electronic device.
4. The method as claimed in claim 2, further comprising:
terminating access to the electronic device after detecting decoupling of the portable authenticator from the electronic device.
5. The method as claimed in claim 2, further comprising:
activating one or more security functions after detecting decoupling of the portable authenticator from the electronic device.
6. The method as claimed in claim 5, wherein the one or more security functions comprise clearing information from a display of the electronic device.
7. The method as claimed in claim 5, wherein the one or more security functions comprise erasing previously encrypted information that was decrypted and stored at the electronic device after providing access to the electronic device.
8. The method as claimed in claim 1, wherein the second determination is that the entered password does not correspond to the stored portable authenticator password, the method further comprising:
denying unrestricted access to the electronic device.
9. The method as claimed in claim 8, the method further comprising:
performing one or more error processing operations.
10. The method as claimed in claim 9, wherein the one or more error processing operations comprise erasing one or more data items stored at the electronic device or erasing one or more data items stored at the portable authenticator or both.
11. The method as claimed in claim 9, wherein the first determination is that the entered password corresponds to the stored electronic device password and wherein the error processing operations comprise providing access only to one or more low-security functions of the electronic device.
12. A method in an electronic device of facilitating access to the electronic device, the method comprising:
detecting an attempt to access the electronic device;
in response to detecting the attempt, prompting for entry of a first password and a second password at the electronic device;
receiving a first entered password and a second entered password at the electronic device;
performing at the electronic device a first determination whether the first entered password corresponds to a stored electronic device password;
transmitting the second entered password to a portable authenticator that is communicably coupled to the electronic device, in order for the portable authenticator to perform a second determination whether the second entered password corresponds to a first stored portable authenticator password;
receiving the second determination from the portable authenticator; and
controlling access to the electronic device in accordance with the first determination and the second determination.
13. The method as claimed in claim 12, wherein the first determination is that the first entered password corresponds to the stored electronic device password and the second determination is that the second entered password corresponds to the first stored portable authenticator password, the method further comprising:
providing access to the electronic device.
14. The method as claimed in claim 13, further comprising:
replacing the electronic device password with the second entered password.
15. The method as claimed in claim 13, wherein the electronic device stores a second stored portable authenticator password, the method further comprising:
receiving the first stored portable authenticator password from the portable authenticator; and
wherein the first stored portable authenticator password does not correspond to the second stored portable authenticator password, replacing the second stored portable authenticator password stored at the electronic device with the first stored portable authenticator password received from the portable authenticator.
16. An electronic device comprising:
a portable authenticator interface through which the electronic device is configured to be communicably coupled to a portable authenticator;
an input device through which the electronic device is configured to receive an entered password;
a processor communicably coupled to the portable authenticator interface and to the input device; and
a memory communicably coupled to the processor, the memory to store software arranged:
to prompt for password entry at the electronic device in response to detecting at the electronic device an attempt to access the electronic device;
to receive the entered password via the input device;
to perform at the electronic device a first determination whether the entered password corresponds to a stored electronic device password;
to transmit the entered password to the portable authenticator via the portable authenticator interface, in order for the portable authenticator to perform a second determination whether the entered password corresponds to a stored portable authenticator password;
to receive the second determination from the portable authenticator via the portable authenticator interface; and
to control access to the electronic device in accordance with the first determination and the second determination.
17. The electronic device as claimed in claim 16, wherein the first determination is that the entered password does not correspond to the stored electronic device password and the second determination is that the entered password corresponds to the stored portable authenticator password, the software further arranged:
to receive portable authenticator information from the portable authenticator via the portable authenticator interface; and
where a portion of the portable authenticator information matches a corresponding portion of portable authenticator information stored in the memory of the electronic device, to provide access to a subset of functions of the electronic device and to deny unrestricted access to the electronic device.
18. The electronic device as claimed in claim 16, wherein the first determination is that the entered password does not correspond to the stored electronic device password and the second determination is that the entered password corresponds to the stored portable authenticator password, the software further arranged:
to receive portable authenticator information from the portable authenticator via the portable authenticator interface; and
where the portable authenticator information matches portable authenticator information stored in the memory of the electronic device, to provide access to the electronic device.
19. An electronic device comprising:
a portable authenticator interface through which the electronic device is configured to be communicably coupled to a portable authenticator;
an input device through which the electronic device is configured to receive a first entered password and a second entered password;
a processor communicably coupled to the portable authenticator interface and to the input device; and
a memory communicably coupled to the processor, the memory to store software arranged:
to prompt for entry of a first password and a second password at the electronic device in response to detecting an attempt to access the electronic device;
to receive the first entered password and the second entered password via the input device;
to perform at the electronic device a first determination whether the first entered password corresponds to a stored electronic device password;
to transmit the second entered password to a portable authenticator via the portable authenticator interface, in order for the portable authenticator to perform a second determination whether the second entered password corresponds to a stored portable authenticator password;
to receive the second determination from the portable authenticator via the portable authenticator interface; and
to control access to the electronic device in accordance with the first determination and the second determination.
20. The electronic device as claimed in claim 19, wherein the first determination is that the first entered password corresponds to the stored electronic device password and the second determination is that the second entered password corresponds to the stored portable authenticator password, the software further arranged:
to provide access to the electronic device.
21. The electronic device as claimed in claim 19, wherein the second determination is that the second entered password does not correspond to the stored portable authenticator password, the software further arranged:
to deny unrestricted access to the electronic device.
22. The electronic device as claimed in claim 21, wherein the first determination is that the first entered password corresponds to the stored electronic device password, the software further arranged:
to provide access only to one or more low-security functions of the electronic device.
23. A computer readable medium able to be communicably coupled to a processor of an electronic device, the computer readable medium storing software arranged:
to prompt for password entry at the electronic device in response to detecting at the electronic device an attempt to access the electronic device;
to receive an entered password via an input device of the electronic device;
to perform at the electronic device a first determination whether the entered password corresponds to a stored electronic device password;
to transmit the entered password from the electronic device to a portable authenticator via a portable authenticator interface of the electronic device, in order for the portable authenticator to perform a second determination whether the entered password corresponds to a stored portable authenticator password;
to receive the second determination from the portable authenticator via the portable authenticator interface; and
to control access to the electronic device in accordance with the first determination and the second determination.
24. The computer readable medium as claimed in claim 23, wherein the first determination is that the entered password does not correspond to the stored electronic device password and the second determination is that the entered password corresponds to the stored portable authenticator password, the software further arranged:
to receive portable authenticator information from the portable authenticator via the portable authenticator interface; and
where a portion of the portable authenticator information matches a corresponding portion of portable authenticator information stored in the memory of the electronic device, to provide access to a subset of functions of the electronic device and to deny unrestricted access to the electronic device.
25. The computer readable medium as claimed in claim 23, wherein the first determination is that the entered password does not correspond to the stored electronic device password and the second determination is that the entered password corresponds to the stored portable authenticator password, the software further arranged:
to receive portable authenticator information from the portable authenticator via the portable authenticator interface; and
where the portable authenticator information matches portable authenticator information stored in the memory of the electronic device, to provide access to the electronic device.
26. A computer readable medium able to be communicably coupled to a processor of an electronic device, the computer readable medium storing software arranged:
to prompt for entry of a first password and a second password at the electronic device in response to detecting an attempt to access the electronic device;
to receive a first entered password and a second entered password via an input device of the electronic device;
to perform at the electronic device a first determination whether the first entered password corresponds to a stored electronic device password;
to transmit the second entered password from the electronic device to a portable authenticator via a portable authenticator interface of the electronic device, in order for the portable authenticator to perform a second determination whether the second entered password corresponds to a stored portable authenticator password;
to receive the second determination from the portable authenticator via the portable authenticator interface; and
to control access to the electronic device in accordance with the first determination and the second determination.
27. The computer readable medium as claimed in claim 26, wherein the first determination is that the first entered password corresponds to the stored electronic device password and the second determination is that the second entered password corresponds to the stored portable authenticator password, the software further arranged:
to provide access to the electronic device.
28. The computer readable medium as claimed in claim 26, wherein the second determination is that the second entered password does not correspond to the stored portable authenticator password, the software further arranged:
to deny unrestricted access to the electronic device.
29. The computer readable medium as claimed in claim 28, wherein the first determination is that the first entered password corresponds to the stored electronic device password, the software further arranged:
to provide access only to one or more low-security functions of the electronic device.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. An optical fourth-harmonic generation system comprising:
a resonant cavity configured to support electromagnetic radiation of a fundamental frequency;
a fourth-harmonic generator disposed within the resonant cavity configured to produce electromagnetic radiation of a fourth-harmonic frequency from an interaction with radiation of the fundamental frequency,
wherein the fundamental is characterized by a p-polarization that is complementary to an s-polarization that characterizes the fourth-harmonic radiation,
wherein the fourth-harmonic generator has an output facet oriented substantially at a Brewster’s angle with respect to the electromagnetic radiation of the fundamental frequency,
whereby radiation of the fundamental frequency and radiation of the fourth-harmonic frequency emerging from the output facet may be spatially separated as they emerge from the output facet.
2. The system of claim 1 wherein the output facet is substantially uncoated.
3. The system of claim 1 further comprising means disposed within the resonant cavity, for generating electromagnetic radiation of the fundamental frequency.
4. The system of claim 1 wherein the fourth-harmonic generator includes an input facet oriented substantially at a Brewster’s angle B with respect to electromagnetic radiation of the fundamental frequency.
5. The system of claim 4 wherein the input and output facets of the fourth-harmonic generator are substantially uncoated.
6. The system of claim 4 wherein the input and output facets of the fourth-harmonic generator are substantially parallel to each other.
7. The system of claim 4 wherein the input and output facets are out of parallel with respect to each other.
8. The system of claim 7 wherein the input and output facets deviate from being parallel to each other by approximately 1802 B.
9. The system of claim 1 wherein the fourth-harmonic generator is configured to produce electromagnetic radiation of the fourth-harmonic frequency by an interaction with radiation of the fundamental frequency and third-harmonic radiation having a frequency corresponding to a third-harmonic of the fundamental frequency.
10. The system of claim 9 further comprising a third-harmonic generator disposed within the resonant cavity and in optical communication with the fourth-harmonic generator,
wherein the third harmonic generator is configured to produce the third-harmonic radiation by an interaction with radiation of the fundamental frequency and second-harmonic radiation characterized by a frequency corresponding to a second-harmonic of the fundamental frequency.
11. The system of claim 1 wherein the resonant cavity is configured such that radiation of the fourth-harmonic frequency that emerges from the output facet exits the resonant cavity as an output radiation.
12. The system of claim 1 wherein the fourth-harmonic generator includes a crystal selected from the group of lithium triborate (LBO), beta-barium borate (BBO), cesium lithium borate (CLBO), KTP, isomorphs of KTP, ADA, ADP, CBO, DADA, DADP, DKDP, DLAP, DRDP, KABO, KDA, KDP, LB4, or LFM.
13. The system of claim 1 wherein the reaction that generates the fourth-harmonic radiation is phase matched in the fourth-harmonic generator.
14. An optical fourth-harmonic generation system comprising:
a resonant cavity configured to support electromagnetic radiation of a fundamental frequency;
a second-harmonic generator disposed within the resonant cavity, configured to produce electromagnetic radiation of a second-harmonic frequency from the radiation of the fundamental frequency;
a third-harmonic generator disposed within the resonant cavity and in optical communication with the second-harmonic generator, configured to produce electromagnetic radiation of a third-harmonic frequency from the second-harmonic frequency radiation and the radiation of the fundamental frequency, and
a fourth-harmonic generator disposed within the resonant cavity, configured to produce electromagnetic radiation of a fourth-harmonic frequency from the third-harmonic frequency radiation and the radiation of the fundamental frequency,
wherein the fundamental and third-harmonic radiation are characterized by a p-polarization that is complementary to an s-polarization that characterizes the second and fourth-harmonic radiation,
wherein the fourth-harmonic generator has an output facet oriented substantially at a Brewster’s angle with respect to the electromagnetic radiation of the fundamental frequency and the electromagnetic radiation of the third-harmonic frequency
whereby radiation of the fundamental frequency and radiation of the fourth-harmonic frequency emerging from the output facet may be spatially separated as they emerge from the output facet.
15. The system of claim 14 wherein the output facet is substantially uncoated.
16. The system of claim 14 wherein the output facet is resistant to optical damage caused by said radiation of the fourth or third-harmonic frequencies.
17. The system of claim 14 further comprising an optical gain medium situated within the resonant cavity.
18. The system of claim 17 wherein the fourth-harmonic generator is situated along an optical path between the active medium and the third-harmonic generator such that an input facet of the fourth-harmonic generator faces the third-harmonic generator and the output facet faces the active medium.
19. The system of claim 17 further comprising a Q-switch disposed within the resonant cavity.
20. The system of claim 14 wherein the fourth-harmonic generator includes an input facet oriented substantially at a Brewster’s angle with respect to electromagnetic radiation of the fundamental frequency and electromagnetic radiation of the third-harmonic frequency.
21. The system of claim 20 wherein the input and output facets of the fourth-harmonic generator are substantially uncoated.
22. The system of claim 20 wherein the third-harmonic generator includes an output facet disposed facing the input facet of the fourth-harmonic generator, wherein the output facet of the third-harmonic generator is oriented substantially at a Brewster’s angle B with respect to electromagnetic radiation of the fundamental frequency and electromagnetic radiation of the third-harmonic frequency.
23. The system of claim 22 wherein the input and output facets of the fourth-harmonic generator are substantially parallel with respect to each other.
24. The system of claim 22 wherein the input and output facets of the fourth-harmonic generator are out of parallel with respect to each other.
25. The system of claim 24 wherein the input and output facets deviate from being parallel to each other by approximately 1802 B.
26. The system of claim 22 wherein the input and output facets of the fourth-harmonic generator and the output facet of the third-harmonic generator are substantially uncoated.
27. The system of claim 14 wherein the fourth-harmonic generator includes a crystal selected from the group of lithium triborate (LBO), beta-barium borate (BBO), cesium lithium borate (CLBO), KTP, isomorphs of KTP, ADA, ADP, CBO, DADA, DADP, DKDP, DLAP, DRDP, KABO, KDA, KDP, LB4, or LFM.
28. The system of claim 27 wherein the wherein the reaction that generates the fourth-harmonic radiation is phase matched in the fourth-harmonic generator.
29. An optical fourth harmonic generation method, comprising:
resonating electromagnetic radiation of a fundamental frequency in a cavity;
generating radiation of a fourth-harmonic of the fundamental frequency using a fourth harmonic generator disposed within the cavity, wherein the fundamental radiation is characterized by a p polarization that is complementary to an s polarization that characterizes the fourth-harmonic radiation,
spatially separating the fundamental radiation from the fourth-harmonic radiation at an output facet of the fourth-harmonic generator that is oriented substantially at a Brewster’s angle with respect to the electromagnetic radiation of the fundamental frequency.
30. The method of claim 29 wherein generating the fourth-harmonic radiation includes an interaction between the fundamental radiation and radiation having a frequency corresponding to a third-harmonic of the fundamental frequency.
31. The method of claim 30 wherein the fourth-harmonic generator includes a crystal selected from the group of lithium triborate (LBO), beta-barium borate (BBO), cesium lithium borate (CLBO), KTP, isomorphs of KTP, ADA, ADP, CBO, DADA, DADP, DKDP, DLAP, DRDP, KABO, KDA, KDP, LB4, or LFM.
32. The method of claim 31 wherein the reaction that generates the fourth-harmonic radiation is phase matched in the fourth-harmonic generator.
33. The method of claim 29, further comprising generating electromagnetic radiation of the fundamental frequency.
34. An optical fourth harmonic generation system, comprising:
cavity means for resonating electromagnetic radiation of a fundamental frequency;
fourth harmonic generator means disposed within the cavity for generating radiation of a fourth-harmonic of the fundamental frequency, wherein the fourth-harmonic radiation is characterized by an s polarization that is complementary to a p polarization that characterizes the fundamental radiation,
means for spatially separating the fundamental radiation from the fourth-harmonic radiation at an output facet of the fourth-harmonic generator that is oriented substantially at a Brewster’s angle with respect to the electromagnetic radiation of the fundamental frequency
whereby radiation of the fundamental frequency and radiation of the fourth-harmonic frequency emerging from the output facet may be spatially separated as they emerge from the output facet.