Constant-voltage red light semiconductor laser module with stable output power and preparation method and application thereof

Abstract

The application relates to a constant-voltage red light semiconductor laser module with stable power output and a preparation method and application thereof. The module comprises a heat sink, a red light LD chip, a photodiode, a feedback circuit chip and a matching resistor; the heat sink is centrally provided with a first metal area, and a fourth metal area is arranged below the first metal area; a second metal area is arranged on one side of the first metal area, and a U-shaped third metal area is arranged on the other side of the first metal area, and a fifth metal area is arranged in the U-shaped structure; the red light LD chip is arranged on the first metal area, and the photodiode is arranged directly below the red light LD chip; the feedback circuit chip is arranged on the fourth metal area; and the matching resistor is arranged at two ends of the third metal area and the fifth metal area. The photodiode feedback current is used to adjust the working current of the laser by the feedback circuit chip, the influence of temperature on the light power is effectively avoided, and the laser cutting, laser lighting, laser marking, printing and other work can provide a continuous and stable positioning indication function.

Description

Technical Field

[0001] This invention relates to a constant-voltage red semiconductor laser module with stable power output, its fabrication method and application, belonging to the field of semiconductor laser application technology. Background Technology

[0002] Fiber-coupled semiconductor lasers are widely used due to their flexibility in semiconductor laser pumping, fiber laser pumping, laser cutting, laser illumination, laser marking, printing, and other fields. However, the main lasers currently used are generally near-infrared and invisible, requiring visible light for positioning and indication before or during operation. This indicator light is typically a milliwatt-level red semiconductor laser, coaxially output with the main laser via fiber optic or spatial beam combining to achieve high directivity. However, red semiconductor lasers have low operating currents, typically tens of milliamps, low damage thresholds, and high requirements for power supply stability; high current or overvoltage can cause device failure. Furthermore, the power of red semiconductor lasers is highly sensitive to temperature changes; higher temperatures result in lower output power, affecting the indicating function.

[0003] Chinese patent document CN205028901U discloses a voltage-regulating semiconductor diode, comprising an anode and a cathode conductor. The diode contains a first doped region connecting the anode conductor and a second doped region connecting the cathode conductor. A protective film made of silicon nitride is disposed on the diode's end face between the anode and cathode conductors. The first doped region comprises a nitride semiconductor and a metal layer, with an ohmic contact between them. A voltage regulator circuit chip can be connected to the outer end face of the diode in parallel. This voltage-regulating semiconductor diode results in a very low reverse leakage current when the protective film is present, reducing the forward startup voltage and conduction losses, ensuring that the current and voltage remain within the normal range, and extending the diode's lifespan. However, the voltage-regulating semiconductor diode proposed in this utility model is only suitable for working environments with constant temperature. Changes in ambient temperature will affect the changes in the thermistor in the voltage-regulating circuit, thereby affecting the circuit's judgment of current and thus affecting the brightness of the diode. Furthermore, the laser diode cannot be coupled into the optical fiber for precise positioning indication.

[0004] Chinese patent document CN102158083A proposes a BUCK converter for stabilizing the output luminous flux of an LED. This converter circuit consists of a photodiode with an internal amplifier, an operational amplifier, a comparator, and an external inductor. The resistance of the photodiode changes according to the received luminous flux from the LED, thus generating a feedback voltage. The BUCK converter circuit then modifies the current input to the LED, thereby adjusting the output luminous flux and achieving a stable output. However, this patent suffers from poor sensitivity and accuracy, and its large size makes it inconvenient to install in devices. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a constant-voltage red semiconductor laser module with stable power output, its fabrication method, and its applications. The purpose of this invention is to provide a stable constant-voltage indicator light for the operation of high-power non-visible light modules. The voltage of this semiconductor laser indicator light can be adjusted as needed, while the laser power remains stable, thus solving the problem of red light power being affected by heat. Furthermore, it is small in size and easily integrated into optical fibers.

[0006] The technical solution of the present invention is as follows:

[0007] A constant-voltage red semiconductor laser module with stable power output includes a heat sink, a red LD chip, a photodiode, a feedback circuit chip, and a matching resistor.

[0008] The heat sink has a first metal zone in the center and a fourth metal zone directly below it; a second metal zone is located on one side of the first metal zone and a U-shaped third metal zone is located on the other side of the first metal zone; a fifth metal zone is located within the U-shaped structure of the third metal zone.

[0009] The red light LD chip is disposed in the first metal region, and a photodiode is disposed directly below the red light LD chip;

[0010] The feedback circuit chip is located in the fourth metal region; the two ends of the matching resistor are located in the third metal region and the fifth metal region, respectively.

[0011] According to a preferred embodiment of the present invention, the heat sink is made of ALN ceramic, gold-plated copper block, or gold-plated circuit board.

[0012] According to a preferred embodiment of the present invention, the power of the red light LD chip is 1 to 100 mW.

[0013] More preferably, the parameters of the red light LD chip are 650nm / 10~20mW.

[0014] According to a preferred embodiment of the present invention, the feedback circuit chip is an IC integrated chip. The photodiode receives the leakage light from the back end of the red LD chip to form a feedback current. The magnitude of the feedback current of the photodiode causes the feedback circuit chip to adjust the current of the red LD chip, thereby making the light output power of the photodiode constant.

[0015] According to a preferred embodiment of the present invention, the matching resistor is a sliding resistor or a fixed resistor.

[0016] The fabrication method of the aforementioned constant-voltage red semiconductor laser module with stable power output includes the following steps:

[0017] Step 1: The red LD chip is encapsulated with its positive electrode facing down in the first metal area of ​​the heat sink, and then the positive electrode of the red LD chip is connected to the second metal area with a gold wire.

[0018] Step 2: Package the photodiode directly below the red LD chip, with the P electrode facing upwards, and then connect the N electrode of the photodiode to the second metal region using gold wires.

[0019] Step 3: Package the feedback circuit chip in the fourth metal region of the heat sink, and then connect it to the red LD chip and the P electrode of the photodiode with gold wires respectively.

[0020] Step 4: Encapsulate the matching resistor within the fifth and third metal regions of the heat sink, connecting one end to the third metal region and the other end to the fifth metal region to obtain a constant voltage red semiconductor laser module with stable power output.

[0021] According to a preferred embodiment of the present invention, in steps 1 to 4, the encapsulation is performed by fixing the material to a heat sink using conductive adhesive or metal solder.

[0022] The application of the aforementioned constant-voltage red semiconductor laser module with stable power output in beam shaping.

[0023] According to a preferred embodiment of the present invention, the specific application method is as follows: the positive terminal of the constant voltage power supply is connected to the third metal region, and the negative terminal is connected to the first metal region. The constant voltage power supply is turned on, and the fast axis and slow axis of the red light LD chip are collimated by a cylindrical lens. Then, the indicator light is made to coincide with the main optical path by a reflector, and the indicator light is coupled into the optical fiber by a focusing lens to provide indication for the infrared laser.

[0024] According to a preferred embodiment of the present invention, the voltage of the constant voltage power supply is 1 to 20V.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. The constant voltage red semiconductor laser module with stable power output provided by the present invention uses photodiode feedback current to enable the feedback circuit chip to adjust the working current of the laser. It has a low temperature, which effectively avoids the influence of temperature on optical power. It has high output power and can provide continuous and stable positioning indication function for laser cutting, laser lighting, laser marking, printing and other work.

[0027] 2. This invention uses photodiodes for LD power monitoring, which results in more accurate and sensitive responses. The integrated module is small in size, making it easy to integrate into devices that require indication. The indicator light is coupled into an optical fiber to provide indication for the infrared laser. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the constant voltage red semiconductor laser module with stable power output of the present invention.

[0029] Figure 2 This is a circuit diagram of the constant voltage red semiconductor laser module with stable power output of the present invention.

[0030] In the diagram: 1. Heat sink; 2. Red LED LD chip; 3. Photodiode; 4. Feedback circuit chip; 5. Matching resistor; 6. First metal region; 7. Second metal region; 8. Third metal region; 9. Fourth metal region; 10. Fifth metal region. Detailed Implementation

[0031] The present invention will be further described below with reference to the embodiments and accompanying drawings, but is not limited thereto.

[0032] Example 1

[0033] like Figures 1-2 As shown, a constant voltage red semiconductor laser module with stable power output includes a heat sink 1, a red LD chip 2, a photodiode 3, a feedback circuit chip 4, and a matching resistor 5.

[0034] The heat sink 1 has a first metal area 6 in the center and a fourth metal area 9 directly below the first metal area 6; a second metal area 7 is provided on one side of the first metal area 6 and a U-shaped third metal area 8 is provided on the other side of the first metal area 6; a fifth metal area 10 is provided inside the U-shaped structure of the third metal area.

[0035] The red light LD chip 2 is disposed in the first metal region 6, and a photodiode 3 is disposed directly below the red light LD chip 2;

[0036] The feedback circuit chip 4 is located in the fourth metal region 9; the two ends of the matching resistor 5 are respectively located in the third metal region 8 and the fifth metal region 10.

[0037] The heat sink 1 is made of ALN ceramic. The red light LD chip 2 has a power of 650nm / 20mW.

[0038] The feedback circuit chip 4 is an IC integrated chip. The photodiode 3 receives the leakage light from the back end of the red LD chip 2 to form a feedback current. The magnitude of the feedback current of the photodiode 3 causes the feedback circuit chip 4 to adjust the current of the red LD chip 2, thereby making the light output power of the photodiode 3 constant.

[0039] The matching resistor 5 is a sliding resistor.

[0040] Example 2

[0041] A constant voltage red semiconductor laser module with stable power output has the structure shown in Example 1, except that the heat sink 1 is made of gold-plated copper block and the red LD chip 2 has a power of 650nm / 10mW.

[0042] Example 3

[0043] A constant voltage red semiconductor laser module with stable power output has the structure shown in Example 1, except that the heat sink 1 is made of gold-plated circuit board and the matching resistor 5 is a fixed resistor.

[0044] Example 4

[0045] The fabrication method of the constant-voltage red semiconductor laser module with stable power output described in Example 1 includes the following steps:

[0046] Step 1: The red LD chip is encapsulated with its positive electrode facing down in the first metal area of ​​the heat sink, and then the positive electrode of the red LD chip is connected to the second metal area with a gold wire.

[0047] Step 2: Package the photodiode directly below the red LD chip, with the P electrode facing upwards, and then connect the N electrode of the photodiode to the second metal region using a gold wire.

[0048] Step 3: Package the feedback circuit chip in the fourth metal region of the heat sink, and then connect it to the red LD chip and the P-terminal of the photodiode with gold wires.

[0049] Step 4: Encapsulate the matching resistor within the fifth and third metal regions of the heat sink, connecting one end to the third metal region and the other end to the fifth metal region to obtain a constant voltage red semiconductor laser module with stable power output.

[0050] Example 5

[0051] The application of the constant-voltage red semiconductor laser module with stable power output described in Example 1 in beam shaping is as follows: Connect the positive terminal of the 20V constant voltage power supply to the fifth metal region and the negative terminal to the first metal region. Turn on the constant voltage power supply, use a cylindrical lens to collimate the fast axis and slow axis of the red LD chip respectively, and then use a reflector to make the indicator light coincide with the main optical path. Couple it into the optical fiber through a focusing lens to provide indication for the infrared laser.

Claims

1. A constant-voltage red semiconductor laser module with stable power output, characterized in that, This includes heat sinks, red LED chips, photodiodes, feedback circuit chips, and matching resistors; The heat sink has a first metal zone in the center and a fourth metal zone directly below it; a second metal zone is located on one side of the first metal zone and a U-shaped third metal zone is located on the other side of the first metal zone; a fifth metal zone is located within the U-shaped structure of the third metal zone. The red light LD chip is disposed in the first metal region, and a photodiode is disposed directly below the red light LD chip; The feedback circuit chip is located in the fourth metal region; the two ends of the matching resistor are located in the third metal region and the fifth metal region, respectively.

2. The constant-voltage red semiconductor laser module with stable power output as described in claim 1, characterized in that, The heat sink is made of ALN ceramic, gold-plated copper block, or gold-plated circuit board.

3. The constant-voltage red semiconductor laser module with stable power output as described in claim 1, characterized in that, The power of the red light LD chip is 1~100mW.

4. The constant-voltage red semiconductor laser module with stable power output as described in claim 3, characterized in that, The parameters of the red light LD chip are 650nm / 10~20 mW.

5. The constant-voltage red semiconductor laser module with stable power output as described in claim 1, characterized in that, The feedback circuit chip is an integrated IC chip.

6. The constant-voltage red semiconductor laser module with stable power output as described in claim 1, characterized in that, The matching resistor is a sliding resistor or a fixed resistor.

7. A method for fabricating a constant-voltage red semiconductor laser module with stable power output as described in any one of claims 1 to 6, characterized in that, The steps include the following: Step 1: The red LD chip is encapsulated with its positive electrode facing down in the first metal area of ​​the heat sink, and then the positive electrode of the red LD chip is connected to the second metal area with a gold wire. Step 2: Package the photodiode directly below the red LD chip, with the P electrode facing upwards, and then connect the N electrode of the photodiode to the second metal region using gold wires. Step 3: Package the feedback circuit chip in the fourth metal region of the heat sink, and then connect the red LD chip to the P-terminal of the photodiode with gold wires. Step 4: Encapsulate the matching resistor within the fifth and third metal regions of the heat sink, connecting one end to the third metal region and the other end to the fifth metal region to obtain a constant voltage red semiconductor laser module with stable power output.

8. The preparation method according to claim 7, characterized in that, In steps 1 to 4, the encapsulation is performed by fixing the material to a heat sink using conductive adhesive or metal solder.

9. The application of the constant voltage red semiconductor laser module with stable power output as described in any one of claims 1 to 6 in beam shaping.

10. The application as described in claim 9, characterized in that, The specific application method is as follows: Connect the positive terminal of the constant voltage power supply to the fifth metal region and the negative terminal to the first metal region. Turn on the constant voltage power supply, use a cylindrical lens to collimate the fast axis and slow axis of the red light LD chip respectively, then use a reflector to make the indicator light coincide with the main optical path, and use a focusing lens to couple the indicator light into the optical fiber to provide an indication for the infrared laser. The constant voltage power supply has a voltage of 1~20V.

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