Heat-assisted magnetic recording device incorporating laser diode temperature control using common-mode voltage
An apparatus comprises a slider configured to facilitate heat assisted magnetic recording. The slider comprises a plurality of bond pads including a first electrical bond pad, a second electrical bond pad, and a ground pad. A laser diode comprises an anode coupled to the first electrical bond pad and a cathode coupled to the second electrical bond pad. The laser diode is operable in a non-lasing state and a lasing state. A heater is coupled between the ground pad and at least one of the anode and cathode of the laser diode. The heater is configured to generate heat for heating the laser diode during the non-lasing state and the lasing state.
1. An apparatus, comprising:
a slider configured to facilitate heat assisted magnetic recording, the slider comprising a plurality of bond pads including a first electrical bond pad, a second electrical bond pad, and a ground pad;
a laser diode comprising an anode coupled to the first electrical bond pad and a cathode coupled to the second electrical bond pad, the laser diode operable in a non-lasing state and a lasing state; and
a heater coupled between the ground pad and at least one of the anode and cathode of the laser diode, the heater configured to generate heat for heating the laser diode during the non-lasing state and the lasing state.
2. The apparatus of claim 1 , wherein the heater is configured to heat the laser diode to avoid a temperature associated with power instability of the laser diode when in the lasing state during a write operation.
3. The apparatus of claim 1 , wherein the heater is configured to:
generate heat for pre-heating the laser diode during the non-lasing state; and
generate steering heat for heating the laser diode when in the lasing state during a write operation.
4. The apparatus of claim 1 , wherein the heater comprises a resistive element.
5. The apparatus of claim 1 , wherein the heater comprises a diode.
6. The apparatus of claim 1 , wherein the heater comprises:
a first resistive element coupled between the ground pad and the anode of the laser diode; and
a second resistive element coupled between the ground pad and the cathode of the laser diode.
7. The apparatus of claim 1 , wherein the heater comprises:
a first diode coupled between the ground pad and the anode of the laser diode; and
a second diode coupled between the ground pad and the cathode of the laser diode.
8. An apparatus, comprising:
a slider configured to facilitate heat assisted magnetic recording, the slider comprising a plurality of bond pads including a first electrical bond pad, a second electrical bond pad, and a ground pad;
a laser diode comprising an anode coupled to the first electrical bond pad and a cathode coupled to the second electrical bond pad, the laser diode operable in a lasing state in response to a first differential voltage supplied to the anode and the cathode, and the laser diode operable in a non-lasing state in response to a second differential voltage supplied to the anode and the cathode; and
a heater coupled between the ground pad and at least one of the anode and cathode of the laser diode, the heater configured to generate heat for heating the laser diode during the non-lasing state and the lasing state in response to a common-mode voltage developed between the ground pad and the at least one of the anode and cathode of the laser diode.
9. The apparatus of claim 8 , wherein the heater is configured to heat the laser diode to avoid a temperature associated with power instability of the laser diode when in the lasing state during a write operation.
10. The apparatus of claim 8 , wherein the heater is configured to:
generate heat for pre-heating the laser diode during the non-lasing state; and
generate steering heat for heating the laser diode when in the lasing state during a write operation.
11. The apparatus of claim 8 , wherein a magnitude of the common-mode voltage is independent of a magnitude of the differential voltage.
12. The apparatus of claim 8 , comprising a laser diode driver coupled to the first and second electrical bond pads, wherein the laser diode driver is configured to adjust a magnitude of the common-mode voltage while maintaining the differential voltage at a substantially constant magnitude.
13. The apparatus of claim 8 , wherein the heater comprises a resistive element.
14. The apparatus of claim 8 , wherein the heater comprises a diode.
15. The apparatus of claim 8 , wherein the heater comprises:
a first resistive element coupled between the ground pad and the anode of the laser diode; and
a second resistive element coupled between the ground pad and the cathode of the laser diode.
16. The apparatus of claim 8 , wherein the heater comprises:
a first diode coupled between the ground pad and the anode of the laser diode; and
a second diode coupled between the ground pad and the cathode of the laser diode.