Simultaneous Output- and Frequency-Stabilization and Single-Frequency Operation of an Internal-Mirror He–Ne Laser by Controlling the Discharge Current

Sasaki, Akira; Ushimaru, Shinji; Hayashi, Takao

doi:10.1143/jjap.23.593

Cited by 15 publications

(2 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The duty cycle may be only a few percent, thus greatly reducing heating and all related thermal effects, such as thermal lensing and damage through overheating [ 8 , 9 , 10 ]. To maintain consistent power of each laser pulse, the driver typically requires a constant-current output [ 11 , 12 , 13 , 14 ]. Such drivers are designed to deliver peak current pulses to LDs while maintaining low average power levels.…”

Section: Introductionmentioning

confidence: 99%

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

Wu,

Liu,

Sun

et al. 2024

Micromachines

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

Wu,

Liu,

Sun

et al. 2024

Micromachines

View full text Add to dashboard Cite

show abstract

“…For this purpose, generally, the current of a strip heater wound around the laser tube can be controlled by an electronic circuit. Although in this method one can achieve a quite high stability, *10 -9 [19], using a heater may change the original features of laser tube, making the stabilization process more difficult due to additional temperature increase in the laser tube, which in turn reduces its lifetime. To overcome the problem, in 1982 Sasaki et al [14] controlled the temperature of the laser tube by a cooling fan and obtained a stability of *10 -8 by this procedure.…”

Section: Introductionmentioning

confidence: 99%

Frequency stabilization of ambience-isolated internal-mirror He–Ne lasers by thermoelectric-cooling thermal compensation

Shirvani-Mahdavi

Narges

2016

J Theor Appl Phys

View full text Add to dashboard Cite

An approach for frequency stabilization of an ambience-isolated internal-mirror He-Ne laser (632.8 nm) utilizing temperature control of the laser tube with Peltier thermoelectric coolers is demonstrated. Measurements indicate that there are an optimal temperature (23°C) and an optimal discharge current (5.5 mA) of laser tube for which the laser light power is separately maximized. To prevent the effect of fluctuation of discharge current on the laser stability, an adjustable current source is designed and fabricated so that the current is set to be optimal (5.50 ± 0.01 mA). To isolate the laser tube from the environment, the laser metallic box connected to two Peltier thermoelectric coolers is surrounded by two thermal and acoustic insulator shells. The laser has two longitudinal modes very often. Any change in the frequency of longitudinal modes at the optimal temperature is monitored by sampling the difference of longitudinal modes' intensities. Therefore, using a feedback mechanism, the current of thermoelectric coolers is so controlled that the frequency of modes stays constant on the gain profile of the laser. The frequency stability is measured equal to 1.17 9 10 -9 (*27009) for less than 1 min and 2.57 9 10 -9 (*12009) for more than 1 h.

show abstract