Electronic cigarette with optical vaporisation system

1. An electronic cigarette comprising:

a main body comprising a vaporising light source;

a cartridge configured to be removably assembled to the main body, wherein the cartridge includes a liquid store for storing a vaporisable medium and an absorber configured to be heated by radiation emitted by the vaporising light source in order to vaporise the vaporisable medium; and

an enabling device adapted to enable propagation of radiation from the vaporising light source to the absorber only when the cartridge is assembled to the main body, such that the vaporising light source cannot propagate light outside the electronic cigarette when the cartridge is disassembled from the main body, and wherein the enabling device comprises a light guide connected to the cartridge, wherein, when the main body and the cartridge are assembled together the light guide is positioned to direct radiation emitted by the vaporising light source towards the absorber.

2. The electronic cigarette of claim 1 , wherein the vaporising light source is oriented away from the absorber and the light guide comprises a surface that reflects radiation emitted by the vaporising light source towards the absorber.

3. The electronic cigarette of claim 1 , wherein the vaporising light source is oriented in order to emit radiation in a direction that is transverse to a longitudinal axis of the electronic cigarette.

4. The electronic cigarette of claim 1 , wherein the enabling device further comprises a sensor, mounted in the main body, configured to detect the presence of the cartridge when it is assembled to the main body, and wherein the enabling device further comprises control electronics configured to enable or inhibit emission of radiation by the vaporising light source based on a signal received from the sensor.

5. The electronic cigarette of claim 4 , wherein the cartridge comprises encoded authentication information that can be read by the sensor when the cartridge is assembled to the main body, wherein the control electronics are configured to authenticate the encoded authentication information thereby to enable or inhibit emission of radiation by the vaporising light source.

6. The electronic cigarette of claim 4 , wherein the sensor is an optical sensor configured to detect the presence or absence of the cartridge.

7. The electronic cigarette of claim 6 , wherein the main body includes a sensing light source and a light detector, wherein light emitted by the sensing light source is only directed towards the light detector when the cartridge is assembled to the main body and wherein light from the sensing light source is directed away from the light detector when the cartridge is disassembled from the main body.

8. The electronic cigarette of claim 4 , wherein the sensor is one of a capacitive sensor, an antenna or a Hall Effect sensor, configured to detect the presence or absence of a corresponding component on the cartridge.

9. The electronic cigarette of claim 4 , wherein the sensor comprises an electrical circuit which is rendered open or closed depending on whether the main body is assembled to the cartridge or disassembled from the cartridge.

10. The electronic cigarette of claim 1 , wherein the enabling device further comprises a gate positioned in the main body, wherein the gate is configured to open when the cartridge is assembled to the main body and to close when the cartridge is disassembled from the main body, wherein the closed gate is positioned in order to block propagation of radiation from the vaporising light source to the absorber.

11. The electronic cigarette of claim 10 , wherein the gate is configured to be opened by the light guide that is connected to the cartridge.

12. The electronic cigarette of claim 1 , wherein the vaporising light source is a laser.

13. A cartridge for use in an electronic cigarette comprising:

a liquid store;

an absorber configured to be heated by radiation emitted by a vaporising light source in a main body of the electronic cigarette in order to vaporise a vaporisable medium; and

an enabling device adapted to enable propagation of radiation from the vaporising light source to the absorber when the cartridge is assembled to the main body and to inhibit propagation of radiation from the vaporising light source to the absorber when the cartridge is disassembled from the main body, wherein the enabling device comprises a light guide, the light guide having a light input surface configured to be optically coupled with a light emitter and an output surface configured to be optically coupled with the absorber.

14. The cartridge according to claim 13 , wherein the light input surface has a tapered angle.

15. An electronic cigarette main body comprising:

a vaporising light source configured to emit radiation towards an absorber in a cartridge in order to vaporise a vaporisable medium; and

an enabling device adapted to enable propagation of radiation from the vaporising light source to the absorber when the cartridge is assembled to the main body and to inhibit propagation of radiation from the vaporising light source to the absorber when the cartridge is disassembled from the main body.

16. The electronic cigarette main body according to claim 15 , wherein the enabling device comprises a light guide.