Laser diode with integrated temperature control unit for a heat-assisted magnetic recording device

Patent metadata

Field	Value
Publication number	US-10283151-B1
Application number	US-201815933721-A
Country	US
Kind code	B1
Filing date	Mar 23, 2018
Priority date	May 2, 2017
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

An apparatus comprises a first electrical contact, a second electrical contact, and a semiconductor device disposed between the first and second electrical contacts. The semiconductor device comprises a laser diode and a temperature control unit. The laser diode comprises p-type semiconductor material and n-type semiconductor material. The temperature control unit comprises p-type semiconductor material, n-type semiconductor material, and a resistor coupled to the laser diode. One of the p-type semiconductor material and the n-type semiconductor material is shared by the laser diode and the temperature control unit.

First claim

What is claimed is:

1. An apparatus, comprising:
a first electrical contact;
a second electrical contact; and
a semiconductor device disposed between the first and second electrical contacts, the semiconductor device comprising:
a laser diode comprising p-type semiconductor material and n-type semiconductor material; and
a temperature control unit comprising p-type semiconductor material, n-type semiconductor material, and a resistor or a shunt coupled to the laser diode;

wherein one of the p-type semiconductor material and the n-type semiconductor material is shared by the laser diode and the temperature control unit.

2. The apparatus of claim 1 , wherein the n-type semiconductor material is shared by the laser diode and the temperature control unit.

3. The apparatus of claim 1 , wherein the p-type semiconductor material is shared by the laser diode and the temperature control unit.

4. The apparatus of claim 1 , wherein:
the laser diode is configured to activate and the temperature control unit is configured to deactivate in response to application of a first differential voltage to the first and second electrical contacts; and
the laser diode is configured to deactivate and the temperature control unit is configured to activate in response to application of a second differential voltage opposite in polarity to the first differential voltage to the first and second electrical contacts.

5. The apparatus of claim 1 , wherein the resistor is configured to generate heat to warm the laser diode when the temperature control unit is activated and the laser diode is deactivated.

6. The apparatus of claim 1 , wherein the temperature control unit is configured to sense a temperature of the laser diode when the temperature control unit is activated and the laser diode is deactivated.

7. The apparatus of claim 1 , wherein:
the laser diode comprises:
first p-type semiconductor material in contact with the first electrical contact;
shared n-type semiconductor material in contact with the second electrical contact; and
an active region between the first p-type semiconductor material and the shared n-type semiconductor material; and

the temperature control unit comprises:
second p-type semiconductor material in contact with second n-type semiconductor material;
the shared n-type semiconductor material in contact with the second electrical contact;
an active region between the second p-type semiconductor material and the shared n-type semiconductor material; and
an electrical shunt between the shared n-type semiconductor material and the second p-type semiconductor material.

8. The apparatus of claim 1 , wherein:
the laser diode comprises:
first n-type semiconductor material in contact with the first electrical contact;
shared p-type semiconductor material in contact with the second electrical contact; and
an active region between the first n-type semiconductor material and the shared p-type semiconductor material; and

the temperature control unit comprises:
second n-type semiconductor material in contact with second p-type semiconductor material;
the shared p-type semiconductor material in contact with the second electrical contact;
an active region between the second n-type semiconductor material and the shared p-type semiconductor material; and
an electrical shunt between the shared p-type semiconductor material and the second n-type semiconductor material.

9. The apparatus of claim 1 , wherein:
the laser diode comprises:
first p-type semiconductor material in contact with the first electrical contact;
first n-type semiconductor material;
an active region between the first p-type semiconductor material and the first n-type semiconductor material;
shared n-type semiconductor material in contact with the second electrical contact;
an electrically insulating layer between the first n-type semiconductor material and the shared n-type semiconductor material; and
a first electrical shunt between the first n-type semiconductor material and the shared n-type semiconductor material; and

the temperature control unit comprises:
second p-type semiconductor material;
second n-type semiconductor material;
an active region between the second p-type semiconductor material and the second n-type semiconductor material;
shared n-type semiconductor material in contact with the second electrical contact;
an electrically insulating layer between the second n-type semiconductor material and the shared n-type semiconductor material; and
a second electrical shunt between the shared n-type semiconductor material and the second p-type semiconductor material;

wherein an electrical insulator is disposed between the first n-type semiconductor material of the laser diode and the second n-type semiconductor material of the temperature control unit.

10. The apparatus of claim 1 , wherein:
the laser diode comprises:
first n-type semiconductor material in contact with the first electrical contact;
first p-type semiconductor material;
an active region between the first n-type semiconductor material and the first p-type semiconductor material;
shared p-type semiconductor material in contact with the second electrical contact;
an electrically insulating layer between the first p-type semiconductor material and the shared p-type semiconductor material; and
a first electrical shunt between the first p-type semiconductor material and the shared p-type semiconductor material; and

the temperature control unit comprises:
second n-type semiconductor material;
second p-type semiconductor material;
an active region between the second n-type semiconductor material and the second p-type semiconductor material;
shared p-type semiconductor material in contact with the second electrical contact;
an electrically insulating layer between the second p-type semiconductor material and the shared p-type semiconductor material; and
a second electrical shunt between the shared p-type semiconductor material and the second n-type semiconductor material;

wherein an electrical insulator is disposed between the first p-type semiconductor material of the laser diode and the second p-type semiconductor material of the temperature control unit.

11. An apparatus, comprising:
a slider configured for heat-assisted magnetic recording, the slider comprising a writer, a near-field transducer, and an optical waveguide configured to communicate light through the slider; and
a semiconductor device integral or coupled to the slider, the semiconductor device disposed between a first electrical contact and a second electrical contact and comprising:
a laser diode coupled to the waveguide and comprising p-type semiconductor material and n-type semiconductor material; and
a temperature control unit comprising p-type semiconductor material, n-type semiconductor material, and a resistor or a shunt coupled to the laser diode;

wherein one of the p-type and n-type semiconductor materials is shared by the laser diode and the temperature control unit.

12. The apparatus of claim 11 , wherein the n-type semiconductor material is shared by the laser diode and the temperature control unit.

13. The apparatus of claim 11 , wherein the p-type semiconductor material is shared by the laser diode and the temperature control unit.

14. The apparatus of claim 11 , wherein:
the laser diode is configured to activate and the temperature control unit is configured to deactivate in response to application of a first differential voltage to the first and second electrical contacts; and
the laser diode is configured to deactivate and the temperatur

Assignees

• Seagate Technology Llc

Inventors

• Wessel James Gary
• Olson Scott Eugene

Classifications

• H01S5/04254

  characterised by the shape · CPC title

• H01S5/026

  Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers (stabilisation of output H01S5/06) · CPC title

• G11B2005/0021

  Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal · CPC title

• H01S5/02453

  Heating, e.g. the laser is heated for stabilisation against temperature fluctuations of the environment (H01S5/0612 takes precedence, for monolithically integrated heaters see also H01S5/0261) · CPC title

• G11B5/4866 Primary

  the arm comprising an optical waveguide, e.g. for thermally-assisted recording · CPC title