Láser pin pwm. Help-__-

I do not understand how to implement or manage the pwm pulses of 0-255.

I have arduino mega + ramps v 1. 4.
I understand that pin 44 is pwm.
I also have this

To be.

https://m.banggood.com/450nm-3500mW-3_5W-Blue-Laser-Module-With-TTL-Modulation-for-DIY-Laser-Cutter-Engraver-p-1103261.html?rmmds=orderdetail


I work with the laser with this code.

/////

int led = 9; // the PWM pin the LED is attached to
int brightness = 0; // how bright the LED is
int fadeAmount = 5; // how many points to fade the LED by

// the setup routine runs once when you press reset:
void setup() {
// declare pin 9 to be an output:
pinMode(led, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop() {
// set the brightness of pin 9:
analogWrite(led, brightness);

// change the brightness for next time through the loop:
brightness = brightness + fadeAmount;

// reverse the direction of the fading at the ends of the fade:
if (brightness = 255) {
fadeAmount = -fadeAmount;
}
// wait for 30 milliseconds to see the dimming effect
delay(30);
}

/////


I send this from the console.

M452 // mode laser
M3 s33 //

but nothing happens.


#define SUPPORT_LASER 1
#define LASER_PIN 44
#define LASER_ON_HIGH 1
#define LASER_WARMUP_TIME 0
#define LASER_PWM_MAX 255
#define LASER_WATT 2


//////****

how to modify this file so that it works?
Drivers.h


#if defined(SUPPORT_LASER) && SUPPORT_LASER

secondspeed_t LaserDriver::intensity = LASER_PWM_MAX; // Intensity to use for next move queued if we want lasers. This is NOT the current value!
secondspeed_t LaserDriver::intens = 0;

bool LaserDriver::laserOn = false;
bool LaserDriver::firstMove = true;

void LaserDriver::initialize()
{
if(EVENT_INITIALIZE_LASER)
{
#if LASER_PIN > -1
SET_OUTPUT(LASER_PIN);
#endif
}
changeIntensity(0);
}

void LaserDriver::changeIntensity(secondspeed_t newIntensity)
{
#if defined(DOOR_PIN) && DOOR_PIN > -1
if(Printer::isDoorOpen()) {
newIntensity = 0; // force laser off if door is open
}
#endif
if(EVENT_SET_LASER(newIntensity))
{
// Default implementation
#if LASER_PIN > -1
WRITE(LASER_PIN,(LASER_ON_HIGH ? newIntensity > 199 : newIntensity < 200));
#endif
}
intens=newIntensity;//for "Transfer" Status Page
}
#endif // SUPPORT_LASER


*********
I modific

#if LASER_PIN > -1
WRITE(LASER_PIN,(LASER_ON_HIGH ? newIntensity > 199 : newIntensity < 200));
#endif


To


#if LASER_PIN > -1
analogWrite( LASER_PIN, newIntensity);
#endif


... no found