Overview on Laser Diode Pumped Solid-State Laser with Direct Pumping Scheme

Kunna, 何坤娜 He; Zhiyi, 魏志义 Wei; Zhiguo, 张治国 Zhang; Chunqing, 高春清 Gao

doi:10.3788/cjl20093607.1679

Cited by 1 publication

(2 citation statements)

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“…Specifically, the output current I D flowing through the LD is sampled by the sampling resistance R S and passed through the current-sensing module to become the feedback voltage V FB , which is compared with the reference voltage V IREF to obtain the error signal V ERR . After passing through the current regulator, the gate-to-source voltage V GS of the MOSFET Q 1 is generated to control the current I D , which is represented by Equation (2), where A FB is the gain of the feedback circuit:…”

Section: Principle and Characteristics Of A Conventional Qcw Ld Drivermentioning

confidence: 99%

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A Load-Adaptive Driving Method for a Quasi-Continuous-Wave Laser Diode

Wu,

Liu,

Sun

et al. 2024

Micromachines

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A quasi-continuous-wave (QCW) laser diode (LD) driver is commonly used to drive diode bars and stacks designed specifically for QCW operations in solid-state lasers. Such drivers are optimized to deliver peak current and voltage pulses to LDs while maintaining low average power levels. As a result, they are widely used in laser processing devices and laser instruments. Traditional high-energy QCW LD drivers primarily use capacitors as energy storage components and pulsed constant-current sources with op-amps and power metal-oxide-semiconductor field-effect transistors (MOSFETs) as their core circuits for generating repeated constant-current pulses. The drawback of this type of driver is that the driver’s output voltage needs to be manually adjusted according to the operating voltage of the load before use to maximize driver efficiency while providing a sufficient current. Another drawback is its inability to automatically adjust the output voltage to maintain high efficiency when the load changes during the driver operation. Drastic changes in the load can cause the driver to fail to function properly in extreme cases. Based on the above traditional circuit structure, this study designed a stability compensation circuit and realized a QCW LD driver for driving a GS20 diode stack with a maximum repetition rate of 100 Hz, a constant current of approximately 300 A, a load voltage of approximately 10 V, and a pulse width of approximately 300 μs. In particular, a high-efficiency, load-adaptive driving method was used with the MOSFETs in the critical saturation region (i.e., between the linear and saturated regions), controlling its power loss effectively while achieving maximum output current of the driver. The experiments demonstrated that the driver efficiency could be maintained at more than 80% when the load current varied from 50 to 300 A.

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Section: Principle and Characteristics Of A Conventional Qcw Ld Drivermentioning

confidence: 99%

“…Diode-pumped solid-state lasers (DPSSLs) are widely used in industrial, scientific, and military fields [ 1 , 2 , 3 , 4 ]. Traditionally, high-power pulsed DPSSLs have been obtained by Q-switching technology, typically using continuous-wave (CW) laser diode (LD) arrays to pump laser gain materials, such as Nd:YAG rods or slabs.…”

Section: Introductionmentioning

confidence: 99%