manufacturer :       Spectra Physics

model :                   J40-8S40

annotation :           Dokumente engl.

The Spectra-Physics Model J40-BL6-106Q system comprises the Model BL6- 106Q solid-state laser head and the Model J40 air-cooled power supply.

Figure 1-1: The Model J40-BL6-106Q system showing the Model BL6- 106Q laser head and the Model J40 air-cooled power supply.

The Vanadate-based laser head is optimized for extreme short pulse dura-tion and high peak power performance with excellent mode quality and sta-bility at high repetition rates.

Vanadate (Nd:YVO ₄ ) is a popular solid-state laser host because of its high gain and because it can provide high-power laser emission at high pulse repetition rates. Vanadate, like all other solid-state active media, exhibits thermal lensing caused by the temperature gradient inside the crystalline material. This temperature gradient creates an optical index gradient that acts as a lens.

The effective focal length of this thermal lens is determined, in part, by the amount of heat generated in the crystal by the pump energy. The more pump energy applied to the crystal, the stronger the thermal lens and the shorter the effective focal length.

The Model BL6-106Q periodic resonator, a compact linear cavity, allows the crystal to be end-pumped to ensure stable, high-power, single spatial mode output and to alleviate any mode quality issues. The round pump beam from a FCbar diode laser module results in a radial temperature gradient with minimal aberrations. The resonator optics are also carefully designed to mode match this pump region.

The Model J40-BL6-106Q system delivers more than 5 W of Q-switched power in the near infrared at 1064 nm in a near diffraction-limited beam (M ² < 1.2). The repetition rate is adjustable from 1 Hz to 150 kHz. The tables at the end of Chapter 3 contain full system specifications.

Some of the advantages of the Model J40-BL6-106Q laser are:

• Short Pulse width (~6 ns)
• High repetition rate
• Excellent pulse-to-pulse stability
• Useful power in a compact size
• Reliability, long lifetime
• Superior mode quality
• Hands-off operation
•  

The Model J40-BL6-106Q Laser System

The Model J40-BL6-106Q system has two components:

Model BL6-106Q laser head

Model J40 power supply

The power supply, output power, laser head type, pulse width, wavelength, drive type and cooling type are indicated by the part number:

J40-BL6-1 06Q

J-Series Power Supply

40 Watt Diode Bar

BL-Series Laser Head

1064 nm Wavelength

6 ns Pulse Width

Q Switched

The Model BL6-106Q Laser Head

The Model BL6-106Q laser head was specifically designed for applications that require a highly efficient, Q-switched, round laser beam with a short pulse width and good mode in a cost effective package. It features a rugged design with a sealed laser head for simple, hands-off operation. Driving the system is a single, patented, industry leading, high-power FCbar diode laser module that provides infrared pump power to end-pump the Vanadate crystal in the laser head.

Specifications

Model J40-BL6-106Q Performance Specifications

General Characteristics

Wavelength                                  1064 nm

Power                                           > 5.0 W

Energy per Pulse                         > 140 µJ

Repetition Rate                            1 Hz to 150 kHz

Pulse Width                                 < 8 ns at 35 kHz

Beam Characteristics

Mode                                            TEM _OO

m2                                                < 1.2

Polarization                                  100:1 vertical

Beam Diameter (at waist)           300 µm

Beam Divergence (full angle)      4.5 mrad

Beam Roundness (far field)        > 90%

Stability

Beam Pointing

near field                                      ±0.25 mm

far field                                         ±50 µrad

Pulse pulse-to-pulse stability

energy                                          1% rms

power                                           < 1.5% rms

Long term average power            ±2% over 1 hour, non-cumulative

Warmup Time                              20 min

Environmental Specifications

Operating Conditions

Temperature range                      18°C to 35°C

Altitude                                         0 to 3,000 meters

Humidity                                       8-90%, non-condensing,

                                                    for temperatures up to 35°C

Non-Operating Conditions

Temperature range                      -20°C to 50°C

Altitude                                         0 to 12,000 meters

Hum

idity                                               8-95%, non-condensing

Model J40-BL6-106Q Electrical/Nlechanical

Specifications

Electrical Requirements              100-240 V~ (±10°/0), 10 A, 50/60 Hz

Power Consumption                    < 1000 W (500 W typical)

Cooling                                         Air-cooled

Weight

    Model BL6-106Q Laser Head    1.5 kg (3.3 lb)

  Model J40 Power Supply           12 kg (26.4 lb)

Power Cable Length                    3 m (9.8 ft)

Optical Fiber Length                    5 m (16 ft)

Fuse Ratings for F1, F2 of the Model J40 Power Supply

Supply Voltage                       Rating                                       Type

100-240 V~                            10 A                                          T 10 A 250 V