What Are The Benefits Of Fiber-coupled Semiconductor Lasers?

The laser beam directly output by the semiconductor laser light-emitting unit is an elliptical asymmetric Gaussian beam with a large divergence angle and extremely uneven spot. In some application fields, it is necessary to shape and homogenize the spot.

Through fiber coupling, the spot output by the optical fiber is a circular symmetrical spot with good uniformity, and the beam quality is improved; at the same time, fiber coupling is an important means to achieve flexible laser transmission, which greatly enhances the flexibility and operability of semiconductor lasers, and is more flexible and convenient to use in medical, processing and other fields. JTBYShield focuses on fiber coupling and mainly provides fiber-coupled semiconductor lasers.

Fiber-coupled semiconductor lasers are a device that combines semiconductor lasers with optical fibers to achieve efficient transmission of laser signals through optical fibers. It uses the interaction of the electrical and optical properties of semiconductor materials to generate lasers, and then transmits optical signals over long distances and stably through optical fibers.

The basic principle of fiber-coupled semiconductor lasers is to focus the laser beam in the semiconductor laser chip to the end of the optical fiber through a coupling lens to achieve coupling between the laser and the optical fiber. This process requires ensuring that the beam diameter is smaller than the core diameter of the optical fiber and the divergence angle is smaller than the angle corresponding to the numerical aperture of the optical fiber.

The structure of a fiber-coupled semiconductor laser includes a laser chip, a coupling lens, an optical fiber, and optical fiber connection components. The laser chip is the core component, and current is injected through electrodes. The coupling lens is used to focus the laser beam to the end of the optical fiber, and the optical fiber connection components are used to fix and protect the optical fiber.

Fiber-coupled semiconductor lasers have the advantages of simple structure, stable performance, easy integration, and wide application. Their small size, high efficiency, and low power consumption make them widely used in communications, industrial manufacturing, and medical fields. At the same time, the manufacturing process is mature and the cost is low.

Classification
1. Classification by wavelength
Depending on the wavelength of the output laser, fiber-coupled semiconductor lasers can be divided into multiple types such as near-infrared, mid-infrared and far-infrared. Each wavelength type of laser has unique advantages in specific application fields.
2. Classification by power
Fiber-coupled semiconductor lasers can be divided into three categories according to the output power: low power, medium power and high power. Low-power lasers are often used in communications and sensing, medium-power lasers are suitable for industrial processing, and high-power lasers are widely used in medical beauty and scientific research.
3. Classification by packaging form
The packaging form of fiber-coupled semiconductor lasers is mainly divided into bare chip packaging, TO packaging and module packaging. Different packaging forms affect the heat dissipation performance, stability and application scenarios of the laser.

Application
1. Optical communication field
Fiber-coupled semiconductor lasers play an important role in optical communication as the pump source of fiber amplifiers and lasers. Its high efficiency, low power consumption and small size make it an ideal choice for high-speed data transmission and long-distance communication.
2. Industrial manufacturing field
In industrial manufacturing, fiber-coupled semiconductor lasers are widely used in processes such as laser cutting, welding and marking. The characteristics of high power and high precision enable it to improve production efficiency and product quality and meet the needs of modern manufacturing.
3. Medical beauty field
Fiber-coupled semiconductor lasers are widely used in the field of medical beauty, such as skin treatment, laser hair removal and ophthalmic surgery. Its high precision and low damage characteristics make it popular in minimally invasive surgery and cosmetic treatment.

What semiconductor laser supporting products can JTBYShield provide?
In addition to high-quality semiconductor lasers, supporting products for applications in different fields can also be provided to provide customers with corresponding solutions. For example, customized driving power supplies, focusing lenses, collimating lenses, etc. can be provided for scientific research applications, optical lenses for the dense arrangement of the printing CTP industry, and imaging lighting and other fields, as well as general fiber couplers and connectors.

Customized semiconductor laser driving power supplies can be realized in the following aspects:
1. Circuit type:
Constant current: The laser light output stability is controlled by a constant supply current.
Constant power: The laser current is fine-tuned through the feedback value of the photodiode PD inside the laser to achieve stable laser output power.
2. Appearance and function selection:
Chassis system: The fiber-coupled semiconductor laser is assembled into the chassis for temperature control, the chassis panel outputs optical fiber, and the LCD panel displays relevant parameters, which can realize continuous power adjustment, activation and standby functions.
Circuit board system: Provide customized products for customers, and can provide driver bare boards and laser temperature control modules separately, so that customers can integrate the whole system with other equipment.
3. The working modes that the power supply can provide (continuous, pulse, single pulse)
It can realize the switching of continuous, pulse and single pulse working modes. The laser pulse operation is realized through TTL pulse electrical modulation, responding to high and low levels of 0-5V, supporting built-in pulse signal source and synchronously outputting pulse signals for easy detection.

What precautions should be taken when operating semiconductor lasers?
1. Safety protection When the laser is working, avoid laser irradiation to the eyes and skin, let alone direct viewing. Wear laser protective glasses when necessary. Especially for lasers in the invisible light band, you should understand their power safety level to avoid injury.

2. Anti-static protection Anti-static measures must be taken during transportation, storage, and use. Short-circuit protection must be connected between the pins during transportation and storage. Operators must wear anti-static wristbands when using.

3. Avoid surges Surges are sudden instantaneous electrical pulses. Semiconductor lasers can cause PN junction breakdown when subjected to instantaneous overvoltage. The optical power generated by the forward overcurrent under instantaneous overvoltage can damage the cleavage surface. To avoid surges, the driving power supply of semiconductor lasers should adopt slow start measures to ensure that the laser has good electrical contact. If a potentiometer is needed to adjust the laser driving current and output power, a current limiting resistor can be connected in series with the potentiometer to avoid surges and damage to the laser due to careless adjustment, which may cause the driving current to exceed the rated current.

4. For lasers with a working current of more than 6A, please use welding to connect the leads. The welding point should be as close to the root of the pin as possible. The force should be appropriate to avoid bending the pin and causing damage to the internal connection. To prevent the semiconductor laser from thermal breakdown due to excessive soldering iron power or long welding time, a low-power (less than 8W) soldering iron should be used, the temperature should be lower than 260℃, the welding time should not exceed 10 seconds, and anti-static protection should be paid attention to.

5. Anti-fouling protection Before using the laser, the fiber end face needs to be cleaned. It can be wiped with alcohol to prevent dust from causing diffraction, scattering and other losses on the laser, which will reduce the quality of the light spot. When the laser is idle, the connector should be protected.

6. Fiber bending The fiber cannot be bent at a large angle to avoid breaking the fiber. The bending radius should be greater than 300 times the diameter of the fiber cladding, and the dynamic bending radius should be greater than 400 times.

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